RESUMEN
Non-classical congenital adrenal hyperplasia (NC-CAH) includes a group of genetic disorders due to a broad class of CYP21A2 variants identifying a disease-causing 'C' genotype. The heterozygous carriers of CYP21 mutations are at increased risk of developing clinically evident hyperandrogenism, even though clinical and laboratory characteristics are still underestimated. With the aim of obtaining a more accurate delineation of the phenotype of heterozygous carrier of CAH, we analyzed clinical, biochemical and molecular characteristics in a cohort of Sicilian subjects. Fifty-seven females with biallelic and monoallelic CYP21A2 variants classifying NC-CAH (24) and heterozygous carriers of CAH (33), respectively were selected. Forty-four females age-matched healthy controls were also enrolled and genotyped for CYP21A2. Clinical, hormonal and genetic data were collected. CYP21A2 monoallelic mutations, defining the heterozygous carriers state, were identified in subjects with clinical features including hirsutism, oligomenorrhoea, overweight and a PCO-like phenotype, particularly occurring in the age of adolescence. Consistently, levels of 17OHP and cortisol were found to be significantly different from NC-CAH. Overall, some clinical and laboratory findings including oligomenorrhea and 17OHP/cortisol ratio were observed as independent markers associated with carriers of CAH. Here we report a high prevalence of late-onset signs of polycystic ovary syndrome (PCOS) and hyperandrogenism in heterozygous carriers. The 17OHP/cortisol ratio may be a predictive tool to identify the carriers of CAH, even though specific cut-off values have not yet been identified.
Asunto(s)
Hiperplasia Suprarrenal Congénita/genética , Hiperandrogenismo/genética , Esteroide 21-Hidroxilasa/genética , Adolescente , Hiperplasia Suprarrenal Congénita/sangre , Hiperplasia Suprarrenal Congénita/complicaciones , Adulto , Niño , Femenino , Heterocigoto , Hirsutismo/sangre , Hirsutismo/etiología , Hirsutismo/genética , Humanos , Hidrocortisona/sangre , Hiperandrogenismo/sangre , Hiperandrogenismo/etiología , Mutación , Oligomenorrea/sangre , Oligomenorrea/etiología , Oligomenorrea/genética , Sobrepeso/sangre , Sobrepeso/etiología , Sobrepeso/genética , Adulto JovenRESUMEN
BACKGROUND: Familial Mediterranean Fever is a monogenic autoinflammatory disease, secondary to mutation of MEFV gene, and typically expressed with recurrent attacks of fever, serositis, rash, aphthous changes in lips and/or oral mucosa. Kawasaki Disease, an acute systemic vasculitis with persistent fever (5 or more days), rash, stomatitis, conjunctivitis, lymphadenopathy, changes in extremities, is currently considered a multifactorial autoinflammatory disease. An infection, as Epstein Barr virus, can be the trigger of Kawasaki Disease. CASE PRESENTATION: We describe the clinical case of a 3-year-old boy with Kawasaki disease. Successfully treated with intravenous immune globulin, acetyl salicylate acid, he late developed anaemia and thrombocytopenia. The Epstein-Barr virus infection has been demonstrated and he showed a resolution of the clinical manifestations of Kawasaki disease with the persistence of coronaritis, without aneurisms. However, for the personal and familial history of monthly recurrent attacks of fever, pharyngitis, abdominal pain, the genetic study of MEFV was performed and demonstrated 3 heterozygous mutations of MEFV (E148Q, P369S, R408Q). CONCLUSIONS: Mutations of MEFV can contribute to increase inflammatory expression in other diseases, as Kawasaki disease.
Asunto(s)
Infecciones por Virus de Epstein-Barr/complicaciones , Fiebre Mediterránea Familiar/complicaciones , Síndrome Mucocutáneo Linfonodular/virología , Preescolar , Infecciones por Virus de Epstein-Barr/genética , Fiebre Mediterránea Familiar/genética , Humanos , Masculino , Síndrome Mucocutáneo Linfonodular/genéticaRESUMEN
BACKGROUND AND AIMS: Few studies exist on the frequency of thiopurine methyltransferase (TPMT) mutation in patients from Southern Europe. We aimed to evaluate the frequency of TPMT mutation in a homogeneous Sicilian cohort of patients with inflammatory bowel disease (IBD), autoimmune and hematological disorders, the rate of thiopurine-related adverse events, and its association with the TPMT genotype. RESULTS: Among 105 patients with IBD, 45 with autoimmune disease, and 34 with hematologic diseases, the homozygous TPMT variant genotype was found in one patient only (0.5%), while the heterozygous TPMT genotype was identified in 8 patients (4.3%). In patients with IBD, leukopenia was observed in ten patients: one had the homozygous TPMT genotype, one the heterozygous genotype, and the remaining eight the wild type genotype. CONCLUSIONS: The frequency of TPMT mutation in a Mediterranean area was low. TPMT genotyping is not a sensitive tool for predicting thiopurine-induced leukopenia.
Asunto(s)
Enfermedades Autoinmunes/genética , Enfermedades Hematológicas/genética , Enfermedades Inflamatorias del Intestino/tratamiento farmacológico , Enfermedades Inflamatorias del Intestino/genética , Metiltransferasas/genética , Adulto , Enfermedades Autoinmunes/tratamiento farmacológico , Azatioprina/efectos adversos , Azatioprina/uso terapéutico , Femenino , Heterocigoto , Homocigoto , Humanos , Inmunosupresores/efectos adversos , Inmunosupresores/uso terapéutico , Italia , Leucopenia/inducido químicamente , Masculino , Mercaptopurina/efectos adversos , Mercaptopurina/uso terapéutico , Persona de Mediana Edad , Mutación , Fenotipo , Polimorfismo GenéticoRESUMEN
The aim of this work was to study the genotype distribution of Sicilian patients with biallelic GJB2 mutations; to correlate genotype classes and/or specific mutations of GJB2 gene (35delG-non-35delG) with audiologic profiles. A total of 10 different mutations and 11 different genotypes were evidenced in 73 SNHL subjects; 35delG (90.36 % of cases) and IVS1+1 (13.69 %) were the most common mutations found in the cohort with a significant difference in the distribution between North and South Sicily. Audiological evaluation revealed a severe (16/73) to profound (47/73) hearing loss (HL) in 86.13 % of cases without significant difference between the degree of HL and the province of origin of the subjects (P = 0.727). The homozygous truncating (T/T) genotype was the most widespread (89.04 % of cases), with a severe-to-profound hearing impairment in 90.36 % of T/T class with respect to truncating/non-truncating (T/NT) and non-truncating/non-truncating (NT/NT) genotypes (P = 0.012). From the comparison of homozygous 35delG and 35delG/non-35delG genotypes, a more profound HL in the homozygous 35delG than in compound heterozygous 35delG/non-35delG (p < 0.0001) resulted. This study confirms that 35delG is the most common mutation in the Mediterranean area with a heterogeneous distribution of the genotypes between North and South Sicily; probands homozygotes for 35delG or presenting a T/T genotype are more apt to have a severe-to-profound HL.
Asunto(s)
Conexinas/genética , Sordera , Pérdida Auditiva Sensorineural , Audiometría/métodos , Niño , Preescolar , Conexina 26 , Sordera/diagnóstico , Sordera/epidemiología , Sordera/genética , Femenino , Estudios de Asociación Genética , Genotipo , Pérdida Auditiva/genética , Pérdida Auditiva Sensorineural/diagnóstico , Pérdida Auditiva Sensorineural/epidemiología , Pérdida Auditiva Sensorineural/genética , Humanos , Masculino , Mutación , Índice de Severidad de la Enfermedad , Sicilia/epidemiología , Adulto JovenRESUMEN
The main purpose of this study was to describe a novel missense mutation (p.D179H) found in a Western Sicily family and to examine the genetic and audiologic profiles of all family members by performing a GJB2 and GJB6 mutations analysis and a complete audiologic assessment. The proband was a 3-month-old infant with a congenital profound sensorineural hearing loss; direct sequencing of the GJB2 revealed the presence of a c.35delG mutation in the heterozygous state and a heterozygous G>C transition at nucleotide 535 in trans; this novel mutation, called p.D179H, resulted in an aspartic acid to histidine change at codon 179. It was also evidenced in the heterozygous state in two members of this family, both with normal hearing. No GJB6 mutations were evidenced in all subjects studied. Considering the genotypic and phenotypic analysis of all family members, we suggest, differently from the p.D179 N mutation previously reported, a recessive mode of inheritance. Functional studies on p.D179H have to be performed to confirm our hypothesis.
Asunto(s)
Conexinas/genética , Familia , Genes Recesivos , Pérdida Auditiva Sensorineural/genética , Adulto , Conexina 26 , Análisis Mutacional de ADN , Genotipo , Pérdida Auditiva Sensorineural/congénito , Humanos , Lactante , Mutación Missense , Linaje , Índice de Severidad de la Enfermedad , SiciliaAsunto(s)
Factor VIII/genética , Hemofilia A/genética , Mutación Missense , Codón/genética , Humanos , MasculinoRESUMEN
Clinically apparent jaundice is unusual in patients with beta-thalassemia major. Co-inheritance of Gilbert syndrome has been reported to cause hyperbilirubinemia in these subjects. Crigler-Najjar syndrome is another rare disorder of bilirubin metabolism caused by mutation in the gene coding the enzyme UGT1A1. We report a patient of beta-thalassemia major who presented with persistent jaundice due to co-inherited Crigler-Najjar syndrome type 2 secondary to a novel mutation in UGT1A1 gene [homozygous base substitution at position 362 (GGT>AGT) in exon 3].
Asunto(s)
Síndrome de Crigler-Najjar/complicaciones , Síndrome de Crigler-Najjar/genética , Ictericia/genética , Talasemia beta/genética , Síndrome de Crigler-Najjar/terapia , Transfusión de Eritrocitos , Resultado Fatal , Moduladores del GABA/uso terapéutico , Glucuronosiltransferasa/genética , Humanos , Lactante , Masculino , Mutación , Fenobarbital/uso terapéuticoAsunto(s)
Colecistitis Alitiásica/etiología , Infecciones por Virus de Epstein-Barr/complicaciones , Enfermedad de Gilbert/complicaciones , Colecistitis Alitiásica/genética , Enfermedad Aguda , Adolescente , Infecciones por Virus de Epstein-Barr/virología , Femenino , Glucuronosiltransferasa/genética , Herpesvirus Humano 4 , Humanos , Mutación , Regiones Promotoras Genéticas/genética , Uridina/metabolismoRESUMEN
When normal development and growth of the calvarial sutures is disrupted, craniosynostosis (premature calvarial suture fusion) may result. Classical craniosynostosis syndromes are autosomal dominant traits and include Apert, Pfeiffer, Crouzon, Jackson-Weiss, and Saethre-Chotzen syndromes. In these conditions, there is premature fusion of skull bones leading to an abnormal head shape, ocular hypertelorism with proptosis, and midface hypoplasia. It is known that mutations in the fibroblast growth factor receptors 1, 2, and 3 cause craniosynostosis. We report on a child with a clinically diagnosed Pfeiffer syndrome that shows the missense point mutation Q289P in exon 8 of the FGFR2 gene. This is a mutation not previously described in the Pfeiffer syndrome but reported in the Crouzon, Jackson-Weiss, and Saethre-Chotzen syndromes. In this paper, we propose the concept that these disorders may represent one genetic condition with phenotypic variability.
Asunto(s)
Acrocefalosindactilia/genética , Receptor Tipo 2 de Factor de Crecimiento de Fibroblastos/genética , Acrocefalosindactilia/diagnóstico , Disostosis Craneofacial/diagnóstico , Disostosis Craneofacial/genética , Exones/genética , Femenino , Humanos , Lactante , Masculino , Fenotipo , Mutación Puntual/genéticaAsunto(s)
Enfermedad de Crohn/genética , Proteínas del Citoesqueleto/genética , Fiebre Mediterránea Familiar/genética , Mutación/genética , Adulto , Estudios de Casos y Controles , Estudios de Cohortes , Enfermedad de Crohn/patología , Femenino , Frecuencia de los Genes , Humanos , Masculino , Proteína Adaptadora de Señalización NOD2/genética , PirinaAsunto(s)
5,10-Metilenotetrahidrofolato Reductasa (FADH2)/genética , Homocigoto , Cirrosis Hepática/genética , Trasplante de Hígado/efectos adversos , Adulto , Biopsia , ADN/genética , Femenino , Humanos , Cirrosis Hepática/etiología , Cirrosis Hepática/patología , Masculino , Persona de Mediana Edad , Mutación , Complicaciones Posoperatorias , Factores de RiesgoRESUMEN
Point mutations and deletions of SRY gene have been described in several cases of XY gonadal dysgenesis. To date, most of these mutations affect the HMG domain of SRY which plays a central role in DNA binding activity of SRY. We report on a non-mosaic XY sex-reversed newborn girl (completely female external genitalia). The direct sequencing of SRY showed a new nonsense mutation in a codon of SRY gene flanking the 3' end of the HMG domain: a thymine is replaced by a guanine at position +387 in codon 129, resulting in the replacement of the amino acid tyrosine (TAT) by a stop codon (TAG). The new mutation of this patient provides further evidence to support the functional importance of the putative DNA binding activity of the HMG-box domain.