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双边幼虫前肠的演变
D Arendt1, U Technau, J Wittbrodt
1European Molecular Biology Laboratory, Developmental Biology Programme, Meyerhofstrasse 1, 69012 Heidelberg, Germany.
Nature
|May 9, 2001
概括
双胞胎幼虫肠道的进化表明,在共同的祖先中保留了结构. 来自Platynereis dumerilii的分子数据表明,早期的双胞胎在它们的初级幼虫中具有三部分肠道.
科学领域:
- 发展生物学 发展生物学
- 进化生物学 进化生物学
- 分子生物学分子生物学
背景情况:
- 双胞胎被分为Protostomia和Deuterostomia,有着不同的幼虫肠道发育.
- 两个群体中的初级幼虫都表现出间接的发育,具有纤毛运动.
- 在原始体和双体幼虫中,管状肠的独立进化是一个普遍的假设.
研究的目的:
- 为了研究双胞胎幼虫肠道发育的进化起源.
- 为了测试幼虫内脏在Protostomia和Deuterostomia的独立进化的假设.
- 为了分析Platynereis dumerilii trochophora幼虫中的基因表达模式.
主要方法:
- 在Platynereis dumerilii.中对基因同类表达 (brachyury,otx,goosecoid) 的分析.
- 将基因表达模式与Deuterostomia幼虫的已知数据进行比较.
- 专注于多叶 Platynereis dumerilii作为一个代表的原始体幼虫.
主要成果:
- 在Platynereis幼虫中的Brachyury和otx基因表达与Deuterostomia初级幼虫中的相似.
- 在Platynereis前肠中的表达反映了其在较高的Deuterostomia中的功能.
- 分子证据支持幼虫前肠和口腔区域的进化保护.
结论:
- 这项研究提供了分子证据,证明了幼虫前和口腔区域在Protostomia和Deuterostomia之间的保护.
- 这些发现挑战了幼虫肠独立进化的假设.
- 数据表明,共同的双胞胎祖先Urbilateria在其主要幼虫中拥有三部分管状肠道.
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