Temperature-dependent sex determination（TSD） is a type of environmental sex determination in which the sex of the embryos depends on the ambient temperature; however,the molecular mechanisms governing this process r...Temperature-dependent sex determination（TSD） is a type of environmental sex determination in which the sex of the embryos depends on the ambient temperature; however,the molecular mechanisms governing this process remain unknown.Aromatase,encoded by the cyp19a1 gene,which converts androgens into estrogens in animals,was considered to be the key gene for TSD.In this study,the 5＇-flanking region of the cyp19a1 gene in Reeves＇ turtle（Mauremys reevesii） was cloned,and the promoter region was identified using the luciferase reporter assay.Then the eggs of Reeves＇ turtle were incubated at different temperatures（26°C： male-biased temperature; 29°C： non-sex-biased temperature and 32°C： female-biased temperature）.During the thermosensitive period,the adrenal kidney gonad complexes（AKG） were sampled.DNA methylation analysis of the AKG samples showed that the promoter region of the cyp19a1 gene was significantly de-methylated in the female-biased temperature regime（P＆lt;0.01）.Quantitative analysis of the cyp19a1 gene and estrogen by q PCR and Elisa assay showed that the expression level of the cyp19a1 gene and estrogen content were both upregulated significantly at the female-biased temperature（P＆lt;0.01）.These results indicated that the de-methylation response of the cyp19a1 gene to incubation temperature,especially at the female-biased temperature,could lead to temperature-specific expression of aromatase and increased estrogen levels,which may further determine gonadal development in Reeves＇ turtle.These findings provide insights into the genetic mechanisms underlying TSD.展开更多
目的探讨CYP19基因多态性与子宫内膜癌的关联性。方法运用限制性片段长度多态性一聚合酶链反应(RFLP-PCR),分析CYP19基因型在正常和患子宫内膜癌妇女的分布。结果包括CYP19长等位基因(A60rA7)的基因型在子宫内膜癌患者中是高表达的(52．...目的探讨CYP19基因多态性与子宫内膜癌的关联性。方法运用限制性片段长度多态性一聚合酶链反应(RFLP-PCR),分析CYP19基因型在正常和患子宫内膜癌妇女的分布。结果包括CYP19长等位基因(A60rA7)的基因型在子宫内膜癌患者中是高表达的(52．9±4．0 v s 68．8±4．6％,P=0．04 and 2．0±2．7 v s 10．0±1．2％,P=0．01)。结论从一定程度来讲,C YP19基因多态性是子宫内膜癌发展的一个基因性的危险因素。展开更多
目的探讨骨质疏松性髋部骨折(osteoporotic hip fracture,OHF)与细胞色素P450芳香化酶编码基因(cyto-chrome P450c19,CYP19)多态性的关系。方法采用群体关联分析的方法,对来自陕西关中人群的400例OHF患者和400例正常对照的7个单核苷酸...目的探讨骨质疏松性髋部骨折(osteoporotic hip fracture,OHF)与细胞色素P450芳香化酶编码基因(cyto-chrome P450c19,CYP19)多态性的关系。方法采用群体关联分析的方法,对来自陕西关中人群的400例OHF患者和400例正常对照的7个单核苷酸多态性(single nucleotide polymorphisms,SNP)位点进行了分型实验和单体型的病例-对照研究。结果共700个个体分型成功,haploview关联分析识别出了3个单体域的单体型,并挑选出7个标签SNP。方差分析的结果表明,位于CYP19基因的SNP位点rs643892和rs3781590以及单体域3区多态性与髋部骨折之间存在相关性。结论细胞色素P450芳香化酶编码基因和我们所研究的陕西关中汉族群体的骨质疏松性骨折(osteoporotic fracture,OF)发病率关联。细胞色素P450芳香化酶编码基因可能对中国陕西关中汉族人群OHF的发病率有影响。展开更多
基金supported financially by the National Natural Science Foundation of China(Nos.31401053 and 31471966)Guangdong Provincial Natural Science Foundation of China(No.2015A030313903)+1 种基金GDAS Special Project of Science and Technology Development(2017GDASCX-0107)the Funds for Environment Construction and Capacity Building of GDAS’Research Platform(2016GDASPT-0107)
文摘Temperature-dependent sex determination（TSD） is a type of environmental sex determination in which the sex of the embryos depends on the ambient temperature; however,the molecular mechanisms governing this process remain unknown.Aromatase,encoded by the cyp19a1 gene,which converts androgens into estrogens in animals,was considered to be the key gene for TSD.In this study,the 5＇-flanking region of the cyp19a1 gene in Reeves＇ turtle（Mauremys reevesii） was cloned,and the promoter region was identified using the luciferase reporter assay.Then the eggs of Reeves＇ turtle were incubated at different temperatures（26°C： male-biased temperature; 29°C： non-sex-biased temperature and 32°C： female-biased temperature）.During the thermosensitive period,the adrenal kidney gonad complexes（AKG） were sampled.DNA methylation analysis of the AKG samples showed that the promoter region of the cyp19a1 gene was significantly de-methylated in the female-biased temperature regime（P＆lt;0.01）.Quantitative analysis of the cyp19a1 gene and estrogen by q PCR and Elisa assay showed that the expression level of the cyp19a1 gene and estrogen content were both upregulated significantly at the female-biased temperature（P＆lt;0.01）.These results indicated that the de-methylation response of the cyp19a1 gene to incubation temperature,especially at the female-biased temperature,could lead to temperature-specific expression of aromatase and increased estrogen levels,which may further determine gonadal development in Reeves＇ turtle.These findings provide insights into the genetic mechanisms underlying TSD.
文摘目的探讨CYP19基因多态性与子宫内膜癌的关联性。方法运用限制性片段长度多态性一聚合酶链反应(RFLP-PCR),分析CYP19基因型在正常和患子宫内膜癌妇女的分布。结果包括CYP19长等位基因(A60rA7)的基因型在子宫内膜癌患者中是高表达的(52．9±4．0 v s 68．8±4．6％,P=0．04 and 2．0±2．7 v s 10．0±1．2％,P=0．01)。结论从一定程度来讲,C YP19基因多态性是子宫内膜癌发展的一个基因性的危险因素。
