RESUMEN
Eusocial insects have polyphenic caste systems in which each caste exhibits characteristic morphology and behaviour. In insects, caste systems arose independently in different lineages, such as Isoptera and Hymenoptera. Although partial molecular mechanisms for the development of eusociality in termites have been clarified by the functional analysis of genes and hormones, the contribution of microRNAs (miRNAs) to caste differentiation is unknown. To understand the role of miRNAs in termite caste polyphenism, we performed small RNA sequencing in a subterranean termite (Reticulitermes speratus) and identified the miRNAs that were specifically expressed in the soldier and worker castes. Of the 550 miRNAs annotated in the R. speratus genome, 74 were conserved in insects and 174 were conserved in other termite species. We found that eight miRNAs (mir-1, mir-125, mir-133, mir-2765, mir-87a and three termite-specific miRNAs) are differentially expressed (DE) in soldiers and workers of R. speratus. This differential expression was experimentally verified for five miRNAs by real-time quantitative PCR. Further, four of the eight DE miRNAs in soldier and worker termite castes were also differentially expressed in hymenopteran castes. The finding that Isoptera and Hymenoptera shared several DE miRNAs amongst castes suggests that these miRNAs evolved independently in these phylogenetically distinct lineages.
Asunto(s)
Jerarquia Social , Isópteros/metabolismo , MicroARNs/metabolismo , Animales , Femenino , Masculino , Análisis de Secuencia de ARNRESUMEN
A homozygous recessive mutation, causing GM1-gangliosidosis in Shiba dogs, was identified as a deletion of C nucleotide 1668 in the gene for canine acid beta-galactosidase, which was a novel mutation in canine GM1-gangliosidosis.
Asunto(s)
Enfermedades de los Perros/enzimología , Enfermedades de los Perros/genética , Gangliosidosis GM1/genética , Gangliosidosis GM1/veterinaria , beta-Galactosidasa/genética , Animales , ADN Complementario/genética , Perros , Reacción en Cadena de la Polimerasa de Transcriptasa InversaRESUMEN
The structure of diheteropeptin (1), a TGF-beta-like active substance from Diheterospora chlamydosporia Q58044, was determined to be a new cyclotetrapeptide, cyclo[2aminoisobutyryl-(S)-phenylalanyl-(R)-prolyl-(2S,8R,9R)-2-am ino-8,9-dihydroxydecanoyl-] by NMR, mass spectrometric and chemical studies.
Asunto(s)
Ácidos Decanoicos/química , Dicroismo Circular , Ácidos Decanoicos/metabolismo , Ácidos Decanoicos/farmacología , Hypocreales/metabolismo , Espectroscopía de Resonancia Magnética , Estructura Molecular , Estereoisomerismo , Factor de Crecimiento Transformador beta/farmacologíaRESUMEN
A new metabolite, diheteropeptin, was found in the culture broth of Diheterospora chlamydosporia Q58044 by screening for TGF-beta-like active substances. Diheteropeptin was extracted from the culture supernatant and purified by a series of chromatographies such as silica gel, gel filtration and HPLC. Diheteropeptin exhibited cytostatic activity in Mv1Lu cells with an IC50 value of 20.3 microM and inhibited histone deacetylase.
Asunto(s)
Ácidos Decanoicos/aislamiento & purificación , Ácidos Decanoicos/farmacología , Hypocreales/metabolismo , Péptidos , Antibacterianos/farmacología , División Celular/efectos de los fármacos , Células Cultivadas , Ácidos Decanoicos/metabolismo , Relación Dosis-Respuesta a Droga , Evaluación Preclínica de Medicamentos/métodos , Inhibidores Enzimáticos/farmacología , Fermentación , Inhibidores de Histona Desacetilasas , Humanos , Concentración 50 Inhibidora , Factor de Crecimiento Transformador beta/farmacologíaRESUMEN
A six-month-old shiba dog with a one-month history of progressive motor dysfunction showed clinical signs of a cerebellar disorder, including ataxia, dysmetria and intention tremor of the head. Histopathological and ultrastructural studies revealed distended neurons packed with membranous cytoplasmic bodies throughout the central nervous system. The activities of lysosomal acid beta-galactosidase in its leucocytes and liver were less than 2 per cent of the control levels, and the compound accumulated in the brain was identified as GM1 ganglioside. A sibling which died immediately after birth was shown to have a beta-galactosidase deficiency in the brain and visceral organs. A family study revealed that the sire and dam of the probands were heterozygotes with approximately half of the normal level of beta-galactosidase activity, suggesting an autosomal recessive pattern of inheritance.
Asunto(s)
Enfermedades de los Perros/diagnóstico , Gangliosidosis GM1/veterinaria , Animales , Enfermedades de los Perros/genética , Enfermedades de los Perros/patología , Perros , Femenino , Gangliósido G(M1)/análisis , Gangliosidosis GM1/diagnóstico , Gangliosidosis GM1/genética , Japón , Masculino , LinajeRESUMEN
DN-2327, 2-(7-chloro-1,8-naphthyridin-2-yl)-3-[(1,4-dioxa-8- azaspiro[4.5]dec-8-yl)carbonylmethyl]isoindolin-1-one, produced anxiolytic, taming and anti-convulsive effects when administered orally to several species of animals. DN-2327 produced few of the sedative-hypnotic and muscle-relaxant effects observed with diazepam. The durations of the anxiolytic and anti-convulsive activities of DN-2327 were much longer than those of diazepam. Tolerance to DN-2327 did not develop when it was administered daily for 14 days in an anti-conflict test (Vogel conflict test). DN-2327 showed potent displacement activity against [3H]diazepam binding. The binding affinity of DN-2327 for benzodiazepine receptors was about twenty times that of diazepam. Furthermore, the affinity of DN-2327 for benzodiazepine receptors was not enhanced by the presence of GABA. There is a wide margin between the doses of DN-2327 that cause the anxiolytic effects and its sedative-hypnotic/muscle-relaxant effects. These results suggest that DN-2327 has more marked anxioselective properties compared with the benzodiazepines.