在肉食 marsupial 的面发育过程中的基因调节动力学
Laura E Cook1, Charles Y Feigin2, John D Hills1
1School of BioSciences, University of Melbourne, Royal Parade, Parkville, Australia.
eLife
|October 28, 2025
概括
像胖尾达纳特这样的类动物,由于独特的增强剂驱动基因表达,显示出加速的面部发育. 这项比较基因组学研究揭示了 marsupials 和胎盘哺乳动物之间面调节景观的关键差异.
科学领域:
- 发展生物学 发展生物学
- 进行比较基因组学.
- 进化生物学 进化生物学
背景情况:
- 囊动物和胎盘哺乳动物表现出不同的生殖策略,囊动物在出生后经历了快速的胚胎发育.
- 与胎盘哺乳动物相比, marsupials 需要加速 orofacial 区域的发展,特别是那些怀孕期非常短的哺乳动物.
研究的目的:
- 为了研究袋鼠肥尾 (Sminthopsis crassicaudata) 和胎盘小鼠之间的面调节景观的分歧.
- 在 marsupial 模型中识别全基因组面部调节元素和相关的基因表达模式.
主要方法:
- 对老鼠和纳特基因组进行比较基因组学分析.
- 增强剂相关的染色质修饰的功能性表征 (H3K4me3和H3K27ac).
- 面RNA测序 (RNA-seq) 用于分析在调节元素附近的基因表达.
主要成果:
- 在纳特基因组中鉴定了60,626种假定增强剂和12,295种假定促进剂.
- 虽然核心面部发育基因被保留,但在Dunnart和老鼠之间的监管格局中存在显著的差异.
- 纳特特异性增强剂与参与神经增殖,肌肉发育,表皮发育和机械传感系统发育的基因相关.
结论:
- 达纳特的加速的口面和感官系统发育可能是由 marsupial 特定的增强剂活动驱动的.
- marsupials 和胎盘动物之间的比较基因组学提供了对增强剂在发育时间转移中的作用的见解.
- 这项研究提供了首个全基因组地图的面调节元素在 marsupial.
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