Asunto(s)

Leucemia Mieloide Aguda , Proteína Tumoral p73 , Humanos , Leucemia Mieloide Aguda/metabolismo , Leucemia Mieloide Aguda/genética , Pronóstico , Proteína Tumoral p73/genética , Proteína Tumoral p73/metabolismo , Femenino , Masculino , Persona de Mediana Edad , Proteínas Nucleares/genética , Proteínas Nucleares/metabolismo , Proteínas de Unión al ADN/genética , Proteínas de Unión al ADN/metabolismo , Proteínas Supresoras de Tumor/genética , Proteínas Supresoras de Tumor/metabolismo , Anciano , Regulación Leucémica de la Expresión Génica , Adulto

RESUMEN

PURPOSE: Prostate cancer (PCa) is a major urological disease that is associated with significant morbidity and mortality in men. LLGL2 is the mammalian homolog of Lgl. It acts as a tumor suppressor in breast and hepatic cancer. However, the role of LLGL2 and the underlying mechanisms in PCa have not yet been elucidated. Here, we investigate the role of LLGL2 in the regulation of epithelial-mesenchymal transition (EMT) in PCa through autophagy in vitro and in vivo. METHODS: PC3 cells were transfected with siLLGL2 or plasmid LLGL2 and autophagy was examined. Invasion, migration, and wound healing were assessed in PC3 cells under autophagy regulation. Tumor growth was evaluated using a shLLGL2 xenograft mouse model. RESULTS: In patients with PCa, LLGL2 levels were higher with defective autophagy and increased EMT. Our results showed that the knockdown of LLGL2 induced autophagy flux by upregulating Vps34 and ATG14L. LLGL2 knockdown inhibits EMT by upregulating E-cadherin and downregulating fibronectin and α-SMA. The pharmacological activation of autophagy by rapamycin suppressed EMT, and these effects were reversed by 3-methyladenine treatment. Interestingly, in a shLLGL2 xenograft mouse model, tumor size and EMT were decreased, which were improved by autophagy induction and worsened by autophagy inhibition. CONCLUSION: Defective expression of LLGL2 leads to attenuation of EMT due to the upregulation of autophagy flux in PCa. Our results suggest that LLGL2 is a novel target for alleviating PCa via the regulation of autophagy.

Asunto(s)

Autofagia , Transición Epitelial-Mesenquimal , Neoplasias de la Próstata , Animales , Humanos , Masculino , Ratones , Autofagia/fisiología , Autofagia/genética , Línea Celular Tumoral , Movimiento Celular/genética , Transición Epitelial-Mesenquimal/genética , Silenciador del Gen , Ratones Desnudos , Neoplasias de la Próstata/patología , Neoplasias de la Próstata/genética , Neoplasias de la Próstata/metabolismo , Proteínas Supresoras de Tumor/genética , Proteínas Supresoras de Tumor/metabolismo

RESUMEN

The embryonal central nervous system (CNS) tumor with PLAGL1 (pleomorphic adenoma gene-like) amplification is a novel type of pediatric neoplasm with a distinct methylation profile, described for the first time in 2022. It may be located anywhere in the neuroaxis and, as its name implies, it is driven by the amplification and overexpression of one of the PLAG family genes. Although the associated clinical, immunohistopathological, and molecular characteristics are well characterized in the seminal report of this entity, data on the radiological features is still lacking. Here, we present a case report of a 4-year-old girl with a biopsy-proven PLAGL1-amplified brainstem tumor and provide a detailed description of the corresponding conventional neuroimaging characteristics, aiming to better delineate this entity and to increase the awareness of this pathology in the radiological community.

Asunto(s)

Factores de Transcripción , Humanos , Femenino , Preescolar , Factores de Transcripción/genética , Proteínas Supresoras de Tumor/genética , Neoplasias de Células Germinales y Embrionarias/diagnóstico por imagen , Neoplasias de Células Germinales y Embrionarias/genética , Neoplasias de Células Germinales y Embrionarias/patología , Imagen por Resonancia Magnética , Amplificación de Genes , Neoplasias del Tronco Encefálico/genética , Neoplasias del Tronco Encefálico/diagnóstico por imagen , Neoplasias del Tronco Encefálico/patología , Proteínas de Ciclo Celular

RESUMEN

Gastric cancer (GC) is a serious threat to human health and an important cause of cancer-related death. Herein, we evaluated the influence of transmembrane protein 158 (TMEM158) on GC cell growth. According to Genomic Spatial Event (GSE) and The Cancer Genome Atlas (TCGA) databases, TMEM158 content is amplified in GC tissues. The diagnostic value of TMEM158 expression in GC is huge. GC sufferers with high expression of TMEM158 were associated with poor overall survival. In addition, TMEM158 content was increased in GC cells. TMEM158 promoted GC cell proliferation by modulating the PI3K/Akt signaling pathway. Lack of TMEM158 reduced GC tumor growth. Collectively, TMEM158 accelerated GC cell proliferation by modulating the PI3K/Akt signaling pathway, making it a prospective biomarker for survival in GC patients.

Asunto(s)

Proteínas Proto-Oncogénicas c-akt , Neoplasias Gástricas , Humanos , Proteínas Proto-Oncogénicas c-akt/metabolismo , Fosfatidilinositol 3-Quinasas/metabolismo , Neoplasias Gástricas/genética , Proliferación Celular/genética , Transducción de Señal , Transformación Celular Neoplásica/genética , Línea Celular Tumoral , Regulación Neoplásica de la Expresión Génica , Proteínas de la Membrana/genética , Proteínas de la Membrana/metabolismo , Proteínas Supresoras de Tumor/genética , Proteínas Supresoras de Tumor/metabolismo

RESUMEN

Prostate cancer (PCa) has a high prevalence and represents an important health problem, with an increased risk of metastasis. With the advance of CRISPR-Cas9 genome editing, new possibilities have been created for investigating PCa. The technique is effective in knockout oncogenes, reducing tumor resistance. MMP9 and miR-21 target genes are associated with PCa progression; therefore, we evaluated the MMP-9 and miR-21 targets in PCa using the CRISPR-Cas9 system. Single guide RNAs (sgRNAs) of MMP9 and miR-21 sequences were inserted into a PX-330 plasmid, and transfected in DU145 and PC-3 PCa cell lines. MMP9 and RECK expression was assessed by qPCR, WB, and IF. The miR-21 targets, integrins, BAX and mTOR, were evaluated by qPCR. Flow cytometry was performed with Annexin5, 7-AAD and Ki67 markers. Invasion assays were performed with Matrigel. The miR-21 CRISPR-Cas9-edited cells upregulated RECK, MARCKS, BTG2, and PDCD4. CDH1, ITGB3 and ITGB1 were increased in MMP9 and miR-21 CRISPR-Cas9-edited cells. Increased BAX and decreased mTOR were observed in MMP9 and miR-21 CRISPR-Cas9-edited cells. Reduced cell proliferation, increased apoptosis and low invasion in MMP9 and miR-21 edited cells was observed, compared to Scramble. CRISPR-Cas9-edited cells of miR-21 and MMP9 attenuate cell proliferation, invasion and stimulate apoptosis, impeding PCa evolution.

Asunto(s)

Proteínas Inmediatas-Precoces , MicroARNs , Neoplasias de la Próstata , Masculino , Humanos , Edición Génica , Sistemas CRISPR-Cas/genética , Metaloproteinasa 9 de la Matriz/genética , Metaloproteinasa 9 de la Matriz/metabolismo , ARN Guía de Sistemas CRISPR-Cas , Proteína X Asociada a bcl-2/metabolismo , Neoplasias de la Próstata/genética , Neoplasias de la Próstata/patología , MicroARNs/genética , MicroARNs/metabolismo , Serina-Treonina Quinasas TOR/metabolismo , Proteínas Ligadas a GPI/genética , Proteínas Ligadas a GPI/metabolismo , Proteínas Inmediatas-Precoces/genética , Proteínas Supresoras de Tumor/genética , Proteínas de Unión al ARN/metabolismo

RESUMEN

OBJECTIVES: The pathological mechanisms of patients with Renal Cell Carcinoma (RCC) remain defined. This study aimed to evaluate relationships between the landscape of gene mutations and their clinical significance in RCC patients. METHODS: Tissue and peripheral blood samples of 42 patients with RCC were collected and performed for the Next Generation Sequencing (NGS) with Geneseeq PrimeTM 425-gene panel probes. Their landscapes of gene mutation were analyzed. We also carried out an evaluation of Tumor-Node-Metastasis (TNM) staging, RENAL nephelometry score, surgery, and targeted drug treatment of patients. Then we compared the correlations of landscape in gene mutations and the prognosis. RESULTS: The most common gene alternations, including BAP1, PBRM1, SETD2, CSF1R, NPM1, EGFR, POLE, RB1, and VHL genes, were identified in tissue and blood samples of 75% of patients. EGFR, POLE, and RB1 gene mutations frequently occurred in relapsed and metastatic patients. BAP1, CCND2, KRAS, PTPN11, ERBB2/3, JAK2, and POLE were presented in the patients with > 9 RENAL nephelometry score. Univariable analysis indicated that SETD2, BAP1, and PBRM1 genes were key factors for Disease-Free Survival (DFS). Multivariable analysis confirmed that mutated SETD1, NPM1, and CSF1R were critical factors for the Progression Free Survival (PFS) of RCC patients with target therapy. CONCLUSIONS: Wild-type PBRM1 and mutated BAP1 in patients with RCC were strongly associated with the outcomes of the patient. The PFS of the patients with SETD2, NPM1, and CSF1R mutations were significantly shorter than those patients without variants.

Asunto(s)

Carcinoma de Células Renales , Neoplasias Renales , Humanos , Carcinoma de Células Renales/genética , Neoplasias Renales/genética , Relevancia Clínica , Proteínas Supresoras de Tumor/genética , Proteínas Supresoras de Tumor/uso terapéutico , Mutación , Proteínas Nucleares/genética , Receptores ErbB/genética , Receptores ErbB/uso terapéutico

RESUMEN

Birt-Hogg-Dubé syndrome is a genodermatosis of autosomal dominant inheritance characterized by mutations in the folliculin (FLCN) gene. There is an inappropriate inhibition/activation of a protein, the foliculin, which may cause tumor lesions in skin, renal and lung lesions; they could have more risk of developing pneumothorax compared to the normal population. A 38-year-old male patient with bronchial asthma who consulted for hemoptysis three weeks after recovery from COVID-19 infection. A chest tomography was requested, showing an air cyst in the left lower lobe. Physical examination shows evidence of thoracic skin lesions which a skin biopsy was performed on. The results were compatible with fibrofolliculoma. Differential diagnoses were proposed. A genetic disorder associated with skin lesions was suspected. A multi-genetic panel that includes BRCA1, BRCA2, TP53 and FLCN genes was requested, which reported the mutation of the FLCN gene in heterozygosis classified as pathognomonic of Birt-Hogg-Dubé syndrome. Patient is currently under clinical follow-up while genetic counseling was requested for relatives.

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El síndrome de Birt-Hogg-Dubé es una genodermatosis de herencia autosómica dominante caracterizada por mutaciones en el gen foliculina (FLCN), donde existe inhibición/activación inapropiada de una proteína, la foliculina, que puede causar lesiones tumorales sistémicas, principalmente a nivel de la piel, renal y lesiones pulmonares, presentando mayor riesgo de desarrollar neumotórax en comparación con la población normal. Comunicamos el caso de un varón de 38 años con asma bronquial que consultó por hemoptisis 3 semanas después de la recuperación de la infección por COVID-19. Se solicitó una tomografía de tórax, que mostró un quiste aéreo en el lóbulo inferior izquierdo. Además, presentaba en el examen físico una lesión cutánea que fue biopsiada, presentando diagnóstico de foliculoma. Se plantearon diagnósticos diferenciales y ante la sospecha de probable desorden genético, un panel genético fue solicitado. Se confirmó síndrome de Birt-Hogg-Dubé ante el hallazgo de la deleción heterocigota que comprende el exón 1 del gen FLCN clasificada como patogénica. Actualmente el paciente se encuentra en seguimiento clínico mientras se solicitó estudio genético para familiares.

Asunto(s)

Síndrome de Birt-Hogg-Dubé , COVID-19 , Neumotórax , Masculino , Humanos , Adulto , Síndrome de Birt-Hogg-Dubé/diagnóstico , Síndrome de Birt-Hogg-Dubé/genética , Síndrome de Birt-Hogg-Dubé/patología , Hemoptisis , Proteínas Supresoras de Tumor/genética , Neumotórax/genética

RESUMEN

Bilateral macronodular adrenocortical disease (BMAD) is a neoplastic disease associated with a high frequency of germline disease. Armadillo repeat containing 5 (ARMC5) pathogenic variants (PVs) have not been widely studied to determine the morphological and immunohistochemical characteristics of BMAD. We carried out a detailed morphologic review of 22 surgical specimens excised from patients with BMAD and compared them with PV of ARMC5 (PV + , n = 14) and those without (PV - , n = 8), and further comparing them with a control group of adrenals excised from patients with renal cancer (n = 11). No patients presented with a genetic syndrome related to BMAD. Overt Cushing's syndrome was present in 12/22 patients, 10 PV + and 2 PV - (p = 0.074). We also evaluated the expression of Ki-67, BCL-2, BAX, p53, CYP11B1, and ARMC5 protein. The pseudo-glandular and trabecular architectural patterns were strongly associated with the PV + group (both p < 0.001), as well as capsular extrusion (p < 0.001). There was no predictive value in the distinction of ARMC5 variants in Hsiao subtyping. ARMC5 diffuse cytoplasmic staining was observed in all 11 control samples. The ARMC5 expression was significantly lower in BMAD than in the control group (p < 0.001). In all the specimens, expression of BCL-2 was identified only in the medulla, and expression of BAX was observed in adrenocortical cells. CYP11B1 diffuse immunoexpression was identified in all the specimens of BMAD and in the fasciculata zone in the control group. The mitotic count and Ki-67 proliferation index was very low in all three groups (controls, PV + , and PV - BMAD). None of the specimens stained positive for the p53 protein. Although our series is limited, the presence of pseudo-glandular and/or trabecular patterns and capsular extrusion indicated the presence of pathogenic variants of ARMC5 in BMAD. The gland enlargement does not seem to be related to the increase of mitotic count or a higher proliferation index (Ki-67).

Asunto(s)

Esteroide 11-beta-Hidroxilasa , Proteína p53 Supresora de Tumor , Humanos , Antígeno Ki-67 , Proteína X Asociada a bcl-2 , Proteínas Supresoras de Tumor/genética , Hiperplasia , Proteínas del Dominio Armadillo/genética

RESUMEN

DNA methylation may be involved in the development of osteosarcomas. Osteosarcomas commonly arise during the bone growth and remodeling in puberty, making it plausible to infer the involvement of epigenetic alterations in their development. As a highly studied epigenetic mechanism, we investigated DNA methylation and related genetic variants in 28 primary osteosarcomas aiming to identify deregulated driver alterations. Methylation and genomic data were obtained using the Illumina HM450K beadchips and the TruSight One sequencing panel, respectively. Aberrant DNA methylation was spread throughout the osteosarcomas genomes. We identified 3146 differentially methylated CpGs comparing osteosarcomas and bone tissue samples, with high methylation heterogeneity, global hypomethylation and focal hypermethylation at CpG islands. Differentially methylated regions (DMR) were detected in 585 loci (319 hypomethylated and 266 hypermethylated), mapped to the promoter regions of 350 genes. These DMR genes were enriched for biological processes related to skeletal system morphogenesis, proliferation, inflammatory response, and signal transduction. Both methylation and expression data were validated in independent groups of cases. Six tumor suppressor genes harbored deletions or promoter hypermethylation (DLEC1, GJB2, HIC1, MIR149, PAX6, and WNT5A), and four oncogenes presented gains or hypomethylation (ASPSCR1, NOTCH4, PRDM16, and RUNX3). Our analysis also revealed hypomethylation at 6p22, a region that contains several histone genes. Copy-number changes in DNMT3B (gain) and TET1 (loss), as well as overexpression of DNMT3B in osteosarcomas provide a possible explanation for the observed phenotype of CpG island hypermethylation. While the detected open-sea hypomethylation likely contributes to the well-known osteosarcoma genomic instability, enriched CpG island hypermethylation suggests an underlying mechanism possibly driven by overexpression of DNMT3B likely resulting in silencing of tumor suppressors and DNA repair genes.

Asunto(s)

Neoplasias Óseas , MicroARNs , Osteosarcoma , Humanos , Neoplasias Óseas/genética , Neoplasias Óseas/patología , Islas de CpG/genética , Metilación de ADN/genética , Epigénesis Genética , Oxigenasas de Función Mixta/genética , Osteosarcoma/genética , Osteosarcoma/patología , Regiones Promotoras Genéticas/genética , Proteínas Proto-Oncogénicas/genética , Proteínas Supresoras de Tumor/genética , ADN (Citosina-5-)-Metiltransferasas/metabolismo

RESUMEN

BACKGROUND/AIM: Prostate cancer (PCa) is one of the most frequent neoplasms in men around the world. In recent years, the search for new biomarkers with greater prognostic potential for PCa has intensified. This study aimed to evaluate single nucleotide polymorphisms (SNPs) and a combined panel of these polymorphisms in relation to biochemical recurrence in patients who were through prostatectomy, with an average of 7 years of follow-up. MATERIALS AND METHODS: Patients diagnosed with PCa (n=197) participated in this cohort study. Thirteen SNPs were analyzed: rs2279115 (BCL-2), rs26677604 (CASP3), rs1052571 (CASP9), rs11781886 (NKX3-1), rs2735343 (PTEN), rs2494750 (AKT1), rs2699887 (PI3KCA), rs3195676 (AMACR), rs17302090 (AR), rs2536 (mTOR), rs1695 (GSTP1), rs2308321 (MGMT) and rs1544410 (VDR). Variants were combined and four main panels were defined: cell death, cell survival, growth receptors, and metabolism. Genotyping was performed by real-time PCR. RESULTS: We did not observe any significant relation between the panels of variants analyzed, apart from the rare allele (G) of rs2308321 (MGMT) that was associated with a higher risk of recurrence (p=0.036) when compared to the prevalent (A) in the allelic model. CONCLUSION: This MGMT variant occurs in an exon, and it could potentially affect DNA repair and, therefore, the biochemical relapse of PCa patients.

Asunto(s)

Metilasas de Modificación del ADN , Neoplasias de la Próstata , Humanos , Masculino , Alelos , Estudios de Cohortes , Metilasas de Modificación del ADN/genética , Enzimas Reparadoras del ADN/genética , Polimorfismo de Nucleótido Simple , Pronóstico , Neoplasias de la Próstata/genética , Neoplasias de la Próstata/patología , Recurrencia , Proteínas Supresoras de Tumor/genética

RESUMEN

PURPOSE: Central nervous system high-grade neuroepithelial tumor with MN1 alteration (CNS-HGNET-MN1) is a rare entity defined by its DNA methylation pattern and pathologically considered to be high-grade with mixed patterns, stromal hyalinization, and with astrocytic differentiation. Our aim was to present six pediatric cases to contribute to the characterization of this group of tumors. MATERIAL AND METHODS: Six female patients aged 4 to 12 years with CNS tumors with MN1 alteration identified using genome-wide methylation arrays and/or RT-PCR were included. Clinicopathological, morphological, immunohistochemical, and molecular findings were analyzed. RESULTS: Tumor location was the parietal lobe in four and the intramedullary spinal cord in two. Two were morphologically diagnosed as ependymomas, one as gliofibroma, one as a HGNET-MN1 altered and the other two were difficult to classify. All were well-defined tumors, with a cystic component in three. Only two tumors had extensive stromal hyalinization, three had pseudopapillary formations, and four had other patterns. Multinucleated, clear, and rhabdoid cells were present. Necrosis and histiocyte clusters were also observed. Proliferative index was >10 in four. GFAP, EMA, CK, and SYN were variable, while Olig2 staining was mostly positive. Four of six patients with supratentorial tumors and complete resections were alive and tumor free after 2 to 10 years of follow-up. The two cases with medullary involvement and incomplete resections were alive and undergoing treatment 2 years after surgery. CONCLUSION: Neuroepithelial-MN1 tumors are challenging and suspicion requires molecular confirmation. Our pediatric data contribute to the knowledge for accurate diagnosis. Although further studies with a larger number of cases should be conducted in order to draw more robust conclusions regarding clinico-pathological features, here we present valuable pediatric data to increase the knowledge that may lead to the accurate management of this group of tumors.

Asunto(s)

Neoplasias Encefálicas , Neoplasias del Sistema Nervioso Central , Neoplasias Neuroepiteliales , Neoplasias Supratentoriales , Niño , Humanos , Femenino , Neoplasias Encefálicas/patología , Neoplasias del Sistema Nervioso Central/patología , Neoplasias Neuroepiteliales/genética , Médula Espinal/patología , Transactivadores , Proteínas Supresoras de Tumor/genética

RESUMEN

PURPOSE: Astrocytomas are a type of malignant brain tumor with an unfavorable clinical course. The impact of AGT and MGMT somatic variants in the prognosis of astrocytoma is unknown, and it is controversial for TP53. Moreover, there is a lack of knowledge regarding the molecular characteristics of astrocytomas in Mexican patients. METHODS: We studied 48 Mexican patients, men and women, with astrocytoma (discovery cohort). We performed DNA deep sequencing in tumor samples, targeting AGT, MGMT and TP53, and we studied MGMT gene promoter methylation status. Then we compared our findings to a cohort which included data from patients with astrocytoma from The Cancer Genome Atlas (validation cohort). RESULTS: In the discovery cohort, we found a higher number of somatic variants in AGT and MGMT than in the validation cohort (10.4% vs < 1%, p < 0.001), and, in both cohorts, we observed only women carried variants AGT variants. We also found that the presence of either MGMT variant or promoter methylation was associated to better survival and response to chemotherapy, and, in conjunction with TP53 variants, to progression-free survival. CONCLUSIONS: The occurrence of AGT variants only in women expands our knowledge about the molecular differences in astrocytoma between men and women. The increased prevalence of AGT and MGMT variants in the discovery cohort also points towards possible distinctions in the molecular landscape of astrocytoma among populations. Our findings warrant further study.

Asunto(s)

Astrocitoma , Neoplasias Encefálicas , Femenino , Humanos , Masculino , Astrocitoma/patología , Biomarcadores , Neoplasias Encefálicas/patología , ADN/uso terapéutico , Metilación de ADN , Metilasas de Modificación del ADN/genética , Enzimas Reparadoras del ADN/genética , Mutación , Pronóstico , Análisis de Secuencia de ADN , Proteína p53 Supresora de Tumor/genética , Proteínas Supresoras de Tumor/genética

RESUMEN

INTRODUCTION: Colorectal cancer (CRC) is a complex disease due to the large number of factors that influence its development, including variants in tumor suppressor genes. OBJECTIVE: To estimate allelic and genotypic frequencies of c.3915G>A and c.5371G>A variants of the TSC2 gene in a Mexican population with CRC, as well as to analyze their association with the development of CRC. METHODS: 126 peripheral blood samples from patients diagnosed with sporadic CRC and 134 from healthy individuals, regarded as the control group, were included. Identification of genotypes was carried out using traditional PCR and enzymatic digestion. All individuals signed an informed consent letter. RESULTS: The A allele of the c.3915G>A variant (OR = 0.31, 95% CI = 0.15-0.69, p = 0.004), as well as A/G haplotype of the c.3915G>A and c.5371G>A variants (OR = 0.28, 95% CI = 0.12-0.68, p = 0.005) showed a possible protective effect against sporadic CRC. In silico analysis indicated that both variants generate modifications in the splicing process. CONCLUSION: The presence of TSC2 gene c.3915G>A variant suggests a possible protective effect against sporadic CRC in the Mexican population; however, no association was observed with the c.5371G>A variant.

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INTRODUCCIÓN: El cáncer colorrectal (CCR) es una enfermedad compleja debido al gran número de factores que influyen en su desarrollo, incluyendo variantes en genes supresores de tumores. OBJETIVO: Estimar las frecuencias alélicas y genotípicas de las variantes c.3915G>A y c.5371G>A del gen TSC2 en una población mexicana con CCR, así como analizar la asociación con el desarrollo de CCR. MÉTODOS: Se incluyeron 126 muestras de sangre periférica de pacientes con diagnóstico de CCR esporádico y 134 de individuos sanos, considerados como grupo de control. La identificación de los genotipos se llevó a cabo mediante PCR tradicional y digestión enzimática. Todos los individuos firmaron una carta de consentimiento informado. RESULTADOS: El alelo A de la variante c.3915G>A (RM = 0.31, IC 95 % = 0.15-0.69, p = 0.004), así como el haplotipo A/G de las variantes c.3915G>A y c.5371G>A (RM = 0.28, IC 95 % = 0.12-0.68, p = 0.005) mostraron un posible efecto protector contra CCR esporádico. El análisis in silico indicó que ambas variantes generan modificaciones en el proceso de corte y empalme. CONCLUSIÓN: La presencia de la variante c.3915G>A del gen TSC2 sugiere un posible efecto protector contra CCR esporádico en población mexicana; sin embargo, no se observó esta asociación con la variante c.5371G>A.

Asunto(s)

Neoplasias Colorrectales , Proteína 2 del Complejo de la Esclerosis Tuberosa , Humanos , Neoplasias Colorrectales/genética , Neoplasias Colorrectales/prevención & control , Mutación , Proteína 2 del Complejo de la Esclerosis Tuberosa/genética , Proteínas Supresoras de Tumor/genética

RESUMEN

Ewing sarcoma is a fusion oncoprotein-driven primary bone tumor. A subset of patients (~10%) with Ewing sarcoma are known to harbor germline variants in a growing number of genes involved in DNA damage repair. We recently reported our discovery of a germline mutation in the DNA damage repair protein BARD1 (BRCA1-associated RING domain-1) in a patient with Ewing sarcoma. BARD1 is recruited to the site of DNA double stranded breaks via the poly(ADP-ribose) polymerase (PARP) protein and plays a critical role in DNA damage response pathways including homologous recombination. We thus questioned the impact of BARD1 loss on Ewing cell sensitivity to DNA damage and the Ewing sarcoma transcriptome. We demonstrate that PSaRC318 cells, a novel patient-derived cell line harboring a pathogenic BARD1 variant, are sensitive to PARP inhibition and by testing the effect of BARD1 depletion in additional Ewing sarcoma cell lines, we confirm that BARD1 loss enhances cell sensitivity to PARP inhibition plus radiation. Additionally, RNA-seq analysis revealed that loss of BARD1 results in the upregulation of GBP1 (guanylate-binding protein 1), a protein whose expression is associated with variable response to therapy depending on the adult carcinoma subtype examined. Here, we demonstrate that GBP1 contributes to the enhanced sensitivity of BARD1 deficient Ewing cells to DNA damage. Together, our findings demonstrate the impact of loss-of function mutations in DNA damage repair genes, such as BARD1, on Ewing sarcoma treatment response.

Asunto(s)

Neoplasias Óseas , Tumores Neuroectodérmicos Periféricos Primitivos , Sarcoma de Ewing , Humanos , Sarcoma de Ewing/genética , Inhibidores de Poli(ADP-Ribosa) Polimerasas/farmacología , Daño del ADN/genética , Reparación del ADN/genética , Neoplasias Óseas/genética , Poli(ADP-Ribosa) Polimerasas/genética , Proteínas Supresoras de Tumor/genética , Ubiquitina-Proteína Ligasas/genética , Proteínas de Unión al GTP/genética , Proteína BRCA1/genética

RESUMEN

The vertebrates' scaffold proteins of the Dlg-MAGUK family are involved in the recruitment, clustering, and anchoring of glutamate receptors to the postsynaptic density, particularly the NMDA subtype glutamate-receptors (NRs), necessary for long-term memory and LTP. In Drosophila, the only gene of the subfamily generates two main products, dlgA, broadly expressed, and dlgS97, restricted to the nervous system. In the Drosophila brain, NRs are expressed in the adult brain and are involved in memory, however, the role of Dlg in these processes and its relationship with NRs has been scarcely explored. Here, we show that the dlg mutants display defects in short-term memory in the olfactory associative-learning paradigm. These defects are dependent on the presence of DlgS97 in the Mushroom Body (MB) synapses. Moreover, Dlg is immunoprecipitated with NRs in the adult brain. Dlg is also expressed in the larval neuromuscular junction (NMJ) pre and post-synaptically and is important for development and synaptic function, however, NR is absent in this synapse. Despite that, we found changes in the short-term plasticity paradigms in dlg mutant larval NMJ. Together our results show that larval NMJ and the adult brain relies on Dlg for short-term memory/plasticity, but the mechanisms differ in the two types of synapses.

Asunto(s)

Proteínas de Drosophila , Drosophila , Animales , Encéfalo/metabolismo , Drosophila/genética , Proteínas de Drosophila/metabolismo , Larva/metabolismo , Memoria a Corto Plazo , Receptores de Glutamato/genética , Receptores de Glutamato/metabolismo , Receptores de N-Metil-D-Aspartato/genética , Receptores de N-Metil-D-Aspartato/metabolismo , Sinapsis/metabolismo , Proteínas Supresoras de Tumor/genética

RESUMEN

In this comment, we highlight the diagnosis of Birt-Hogg-Dubé (BHD) in a 60-year-old man was made from identification and removal of normochromic papular cutaneous lesions whose histological examination indicated trichodyscomas and which are considered equivalent to fibrofolliculomas, presence of bilateral renal mass suggestive of angiomyolipomas by imaging exams. A benign/likely benign variant of FLCN in the intron 13 was also detected. Still, his previous pathological history presented other relevant data such as the prior removal of vocal cord angioma, total thyroidectomy, and left parotidectomy due to a cystic lesion whose histopathological examination revealed the presence of oncocytoma and lipomatosis, in addition to basal cell cutaneous carcinoma. Simultaneous gastrointestinal hyperplastic polyposis was found in this patient. The case we reported does not have the genotypic and phenotypic expressions most present in BHDS. These facts make it important for readers to know the clinical and genetic presentation facets of this unusual syndrome.

Asunto(s)

Síndrome de Birt-Hogg-Dubé , Neoplasias Colorrectales , Neoplasias Renales , Síndrome de Birt-Hogg-Dubé/complicaciones , Síndrome de Birt-Hogg-Dubé/diagnóstico , Síndrome de Birt-Hogg-Dubé/genética , Femenino , Humanos , Hiperplasia , Neoplasias Renales/genética , Masculino , Persona de Mediana Edad , Proteínas Proto-Oncogénicas/genética , Proteínas Supresoras de Tumor/genética

RESUMEN

Here we report a case of developmental and epileptic encephalopathy related to RHOBTB2 gene mutation in a ten-month old infant in French Guiana. Although the 28 previously reported cases had early-onset epilepsy and severe intellectual disability, here the reported individual presented with late postnatal onset of microcephaly and the absence of cortical atrophy on MRI. The publication of cases of such a rare form of developmental and epileptic encephalopathy will eventually allow us to better understand the mechanism by which RHOBTB2 misregulation could induce severe and atypical neurological disorders.

Asunto(s)

Epilepsia Generalizada , Epilepsia , Epilepsia/genética , Guyana Francesa , Proteínas de Unión al GTP/genética , Heterocigoto , Humanos , Lactante , Mutación , Proteínas Supresoras de Tumor/genética

RESUMEN

Carotid plaque is a subclinical measure of atherosclerosis. We have previously shown measures of carotid plaque to be heritable in a sample of 100 Dominican families and found evidence for linkage and association of common variants (CVs) on 7q36, 11p15, 14q32 and 15q23 with plaque presence. Our current study aimed to refine these regions further and identify rare variants (RVs) influencing plaque presence. Therefore, we performed targeted sequencing of the one LOD unit down region on 7q36, 11p15, 14q32 and 15q23 in 12 Dominican families with evidence for linkage to plaque presence. Gene-based RV analyses were performed using the Sequence Association Test for familial data (F-SKAT) under two filtering algorithms; 1. all exonic RVs and 2. non-synonymous RVs. Replication analyses were performed using a sample of 22 Dominican families and 556 unrelated Dominicans with Exome Array data. To identify additional non-synonymous RVs influencing plaque, we looked for co-segregation of RVs with plaque in each of the sequenced families. Our most strongly associated gene with evidence for replication was AMPD3 which showed suggestive association with plaque presence in the sequenced families (exonic RV p = 0.003, nonsynonymous RV p = 0.005) and replication families (exonic RV p = 0.04, nonsynonymous RV p = 0.02). Examination of the sequenced family pedigrees revealed two missense variants on chromosome 11 which co-segregated with plaque presence in one of our families; rs61751342 (located in DENND2B), and rs61760882 (located in RNF141). The rs61751342 missense variant is an eQTL for SCUBE2 in the atrial appendage. Notably, SCUBE2 encodes a protein which interacts with vascular endothelial growth factor (VEGF) receptor 2 to regulate VEGF-induced angiogenesis, thus providing biologic plausibility for this gene in atherosclerosis. In conclusion, using targeted sequencing of previously-identified linkage regions, we have identified suggestive evidence for the role of RVs in carotid plaque pathogenesis.

Asunto(s)

Ligamiento Genético , Placa Aterosclerótica/genética , AMP Desaminasa/genética , Proteínas Adaptadoras Transductoras de Señales/genética , Adulto , Anciano , Proteínas de Unión al Calcio/genética , Cromosomas Humanos Par 11/genética , Cromosomas Humanos Par 14/genética , Cromosomas Humanos Par 15/genética , Cromosomas Humanos Par 7/genética , Proteínas de Unión al ADN/genética , República Dominicana , Genotipo , Humanos , Persona de Mediana Edad , Linaje , Placa Aterosclerótica/patología , Polimorfismo Genético , Sitios de Carácter Cuantitativo , Factores de Transcripción/genética , Proteínas Supresoras de Tumor/genética , Receptor 2 de Factores de Crecimiento Endotelial Vascular/genética

RESUMEN

Cardiomyopathy is commonly observed in patients with autosomal dominant polycystic kidney disease (ADPKD), even when they have normal renal function and arterial pressure. The role of cardiomyocyte polycystin-1 (PC1) in cardiovascular pathophysiology remains unknown. PC1 is a potential regulator of BIN1 that maintains T-tubule structure, and alterations in BIN1 expression induce cardiac pathologies. We used a cardiomyocyte-specific PC1-silenced (PC1-KO) mouse model to explore the relevance of cardiomyocyte PC1 in the development of heart failure (HF), considering reduced BIN1 expression induced T-tubule remodeling as a potential mechanism. PC1-KO mice exhibited an impairment of cardiac function, as measured by echocardiography, but no signs of HF until 7-9 months of age. Of the PC1-KO mice, 43% died suddenly at 7 months of age, and 100% died after 9 months with dilated cardiomyopathy. Total BIN1 mRNA, protein levels, and its localization in plasma membrane-enriched fractions decreased in PC1-KO mice. Moreover, the BIN1 + 13 isoform decreased while the BIN1 + 13 + 17 isoform was overexpressed in mice without signs of HF. However, BIN1 + 13 + 17 overexpression was not observed in mice with HF. T-tubule remodeling and BIN1 score measured in plasma samples were associated with decreased PC1-BIN1 expression and HF development. Our results show that decreased PC1 expression in cardiomyocytes induces dilated cardiomyopathy associated with diminished BIN1 expression and T-tubule remodeling. In conclusion, positive modulation of BIN1 expression by PC1 suggests a novel pathway that may be relevant to understanding the pathophysiological mechanisms leading to cardiomyopathy in ADPKD patients.

Asunto(s)

Cardiomiopatía Dilatada , Insuficiencia Cardíaca , Riñón Poliquístico Autosómico Dominante , Canales Catiónicos TRPP , Animales , Ratones , Proteínas Adaptadoras Transductoras de Señales/genética , Proteínas Adaptadoras Transductoras de Señales/metabolismo , Cardiomiopatía Dilatada/patología , Insuficiencia Cardíaca/metabolismo , Miocitos Cardíacos/metabolismo , Proteínas del Tejido Nervioso/metabolismo , Riñón Poliquístico Autosómico Dominante/genética , Isoformas de Proteínas/metabolismo , Canales Catiónicos TRPP/genética , Canales Catiónicos TRPP/metabolismo , Proteínas Supresoras de Tumor/genética , Proteínas Supresoras de Tumor/metabolismo

RESUMEN

It is suggested that HPV-18 variants from the A lineage have higher oncogenic potential compared to B variants. Some studies show uneven distribution of HPV-18 variants in cervical adenocarcinomas and squamous cell carcinomas. Regarding HPV-18 variants' functions, the few studies reported focus on E6, and none were performed using natural host cells. Here, we immortalized primary human keratinocytes (PHKs) with E6/E7 of HPV-18 A1 and B1 sublineages and functionally characterized these cells. PHK18A1 reached immortalization significantly faster than PHK18B1 and formed a higher number of colonies in monolayer and 3D cultures. Moreover, PHK18A1 showed greater invasion ability and higher resistance to apoptosis induced by actinomycin-D. Nevertheless, no differences were observed regarding morphology, proliferation after immortalization, migration, or epithelial development in raft cultures. Noteworthy, our study highlights qualitative differences among HPV-18 A1 and B1 immortalized PHKs: in contrast to PHK18A1, which formed more compact colonies and spheroids of firmly grouped cells and tended to invade and migrate as clustered cells, morphologically, PHK18B1 colonies and spheroids were looser, and migration and invasion of single cells were observed. Although these observations may be relevant for the association of these variants with cervical cancer of different histological subtypes, further studies are warranted to elucidate the mechanisms behind these findings.

Asunto(s)

Transformación Celular Viral , Proteínas de Unión al ADN/genética , Variación Genética , Papillomavirus Humano 18/fisiología , Queratinocitos/virología , Proteínas Oncogénicas Virales/genética , Biomarcadores de Tumor , Línea Celular Tumoral , Movimiento Celular/genética , Proliferación Celular , Células Cultivadas , Daño del ADN , Proteínas de Unión al ADN/metabolismo , Transición Epitelial-Mesenquimal/genética , Humanos , Inmunohistoquímica , Queratinocitos/patología , Proteínas Oncogénicas/genética , Proteínas Oncogénicas/metabolismo , Proteínas Oncogénicas Virales/metabolismo , Infecciones por Papillomavirus/complicaciones , Infecciones por Papillomavirus/virología , Proteínas Supresoras de Tumor/genética , Proteínas Supresoras de Tumor/metabolismo