在卵巢和下丘脑中,Srd5a1在青春期前发育过程中受到不同的调节和甲基化
Ben Bar-Sadeh1, Lilach Pnueli1, Sarai Keestra1,2
1Faculty of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Journal of the Endocrine Society
|August 30, 2023
概括
这项研究表明,雌激醇 (E2) 通过甲基化敏感增强剂控制卵巢Srd5a1基因表达,影响生殖发育. 相比之下,在下丘脑中Srd5a1的表达是由葡萄糖皮质体调节的,而不是E2或甲基化.
科学领域:
- 内分泌学 在内分泌学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 神经内分泌学神经内分泌学
背景情况:
- 5α-减少酶-1 (Srd5a1) 对于类固醇和神经类固醇的合成至关重要.
- 之前的研究表明,在早期免疫应激后,卵巢和下丘脑的Srd5a1表达减少,这与生殖问题有关.
- 卵巢Srd5a1基因甲基化在两个CpG的第一个内置中观察到.
研究的目的:
- 调查Srd5a1第一个内子中的CpG含有位点是否作为甲基化敏感的转录增强剂.
- 阐明在卵巢和下丘脑中Srd5a1表达的组织特异性调节.
- 了解表观遗传机制在生殖表型变异中的作用.
主要方法:
- 在卵巢和下丘脑发育过程中对Srd5a1mRNA水平和CpG甲基化的定量分析.
- 在体外实验中,暴露卵巢细胞和下丘脑GT1-7细胞在雌激醇 (E2) 和德克萨米他.
- 染色体免疫沉 (ChIP) 测试以确定转录因子结合 (ESR1,葡萄糖皮质体受体) 和增强剂标记 (H3K4me1).
- 基于CRISPR的表观遗传编辑 (dCas9-DNMT3,dCas9-TET1) 用于操纵甲基化水平.
主要成果:
- 卵巢Srd5a1mRNA从出生后10-30天增加了8倍,CpG甲基化下降 (高达75%),与E2水平上升相关.
- 暴露于E2增加了卵巢细胞中的Srd5a1表达,通过ESR1与差异甲基化区域结合的介导,通过H3K4me1丰富证实.
- 用dCas9-DNMT3准这个位点增加了甲基化,并取消了E2反应.
- 在下丘脑中,Srd5a1mRNA在出生后的第10天显著下降,并且对E2.2无反应.
- 在下丘脑增强剂中证实了葡萄糖皮质类受体结合,而甲松降低了Srd5a1mRNA水平.
结论:
- 卵巢中Srd5a1的表达是通过由雌激醇控制的甲基化敏感增强剂表观遗传调节的.
- 在下丘脑中Srd5a1的表达是由葡萄皮质激素调节的,独立于在卵巢中观察到的甲基化变化.
- 这些发现突出了Srd5a1调节中的组织特异性表观遗传机制,有助于生殖健康和表型变异.
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