RESUMO
Tilapia is an important fish cultured in tropical and subtropical areas. Cold sensitivity limits the expansion of tilapia culture into colder regions of the world, and mass mortalities of cultured tilapia have been reported due to severe cold currents in winter. Since the late 1990s, several strains of Nile tilapia have been domesticated to improve the ability to adapt to low temperatures. Previous studies revealed that these varieties were more cold-tolerant than the founder population and overwintered naturally well in ponds in the west-south area of Guangdong Province. In this study, to develop tilapia strains with improved cold tolerance for breeding programs through marker-assisted selection, two microsatellite markers, UNH916 and UNH999, showed complete co-segregation with cold tolerance among the polymorphic microsatellite primers. Our results provide a foundation for identifying resistant gene(s) linked with these markers, as well as identifying simple sequence repeat markers associated with cold tolerance that can be used for maker-assisted selection programs in tilapia breeding to increase the growing range and productivity of tilapia aquaculture.
Assuntos
Adaptação Fisiológica/genética , Ciclídeos/genética , Temperatura Baixa , Repetições de Microssatélites/genética , Animais , Cruzamentos Genéticos , Feminino , MasculinoRESUMO
In this case-control study, we assessed the influence of IL-10 -1082A/G and -819T/C on the development of preeclampsia. The IL-10 -1082A/G and -819T/C polymorphisms were assessed by polymerase chain reaction-restriction fragment length polymorphism. The genotype distributions of the IL-10 -1082A/G and -819T/C polymorphisms in the control subjects were in conformance with Hardy-Weinberg equilibrium (HWE; P = 0.46 and 0.17). Unconditional logistic regression analyses revealed that individuals carrying the CC genotype of IL-10 -819T/C were associated with an increased risk of preeclampsia compared to the TT genotype. The odds ratio (95% confidence interval) for the CC genotype of IL-10 -819T/C was 1.71 (1.07-3.27) compared to the TT genotype. In conclusion, the results of our study indicated that the IL-10 -819T/C polymorphism was associated with an increased risk of preeclampsia in a Chinese population.
Assuntos
Predisposição Genética para Doença , Interleucina-10/genética , Polimorfismo de Nucleotídeo Único , Pré-Eclâmpsia/genética , Regiões Promotoras Genéticas , Adulto , Alelos , Povo Asiático , Diagnóstico Precoce , Feminino , Expressão Gênica , Frequência do Gene , Ligação Genética , Humanos , Modelos Logísticos , Razão de Chances , Pré-Eclâmpsia/diagnóstico , Pré-Eclâmpsia/etnologia , Pré-Eclâmpsia/patologia , Gravidez , RiscoRESUMO
The molecular mechanisms and potential clinical applications of neural precursor cells have recently been the subject of intensive study. Dlx5, a homeobox transcription factor related to the distal-less gene in Drosophila, was shown to play an important role during forebrain development. The subventricular zone (SVZ) in the adult brain harbors the largest abundance of neural precursors. The anterior SVZ (SVZa) contains the most representative neural precursors in the SVZ. Further research is necessary to elucidate how Dlx5-related genes regulate the differentiation of SVZa neural precursors. Here, we employed immunohistochemistry and molecular biology techniques to study the expression of Dlx5 and related homeobox genes Er81 and Islet1 in neonatal rat brain and in in vitro cultured SVZa neural precursors. Our results show that Dlx5 and Er81 are also highly expressed in the SVZa, rostral migratory stream, and olfactory bulb. Islet1 is only expressed in the striatum. In cultured SVZa neural precursors, Dlx5 mRNA expression gradually decreased with subsequent cell passages and was completely lost by passage four. We also transfected a Dlx5 recombinant plasmid and found that Dlx5 overexpression promoted neuronal differentiation of in vitro cultured SVZa neural precursors. Taken together, our data suggest that Dlx5 plays an important role during neuronal differentiation.
Assuntos
Animais , Ratos , Ventrículos Cerebrais/citologia , Regulação da Expressão Gênica no Desenvolvimento/fisiologia , Proteínas de Homeodomínio/metabolismo , Neurogênese/fisiologia , Neurônios/citologia , Animais Recém-Nascidos , Diferenciação Celular/fisiologia , Ventrículos Cerebrais/metabolismo , Proteínas de Homeodomínio/genética , Imuno-Histoquímica/métodos , Neurônios/fisiologia , Ratos Wistar , TransfecçãoRESUMO
The molecular mechanisms and potential clinical applications of neural precursor cells have recently been the subject of intensive study. Dlx5, a homeobox transcription factor related to the distal-less gene in Drosophila, was shown to play an important role during forebrain development. The subventricular zone (SVZ) in the adult brain harbors the largest abundance of neural precursors. The anterior SVZ (SVZa) contains the most representative neural precursors in the SVZ. Further research is necessary to elucidate how Dlx5-related genes regulate the differentiation of SVZa neural precursors. Here, we employed immunohistochemistry and molecular biology techniques to study the expression of Dlx5 and related homeobox genes Er81 and Islet1 in neonatal rat brain and in in vitro cultured SVZa neural precursors. Our results show that Dlx5 and Er81 are also highly expressed in the SVZa, rostral migratory stream, and olfactory bulb. Islet1 is only expressed in the striatum. In cultured SVZa neural precursors, Dlx5 mRNA expression gradually decreased with subsequent cell passages and was completely lost by passage four. We also transfected a Dlx5 recombinant plasmid and found that Dlx5 overexpression promoted neuronal differentiation of in vitro cultured SVZa neural precursors. Taken together, our data suggest that Dlx5 plays an important role during neuronal differentiation.