同源异型盒基因的表达表明螯肢类节肢动物保留了它们的中脑节。
Expression of homeobox genes shows chelicerate arthropods retain their deutocerebral segment.
作者信息
Telford M J, Thomas R H
机构信息
Department of Zoology, The Natural History Museum, Cromwell Road, London, SW7 5BD, United Kingdom.
出版信息
Proc Natl Acad Sci U S A. 1998 Sep 1;95(18):10671-5. doi: 10.1073/pnas.95.18.10671.
Abstract
Expression patterns of six homeobox containing genes in a model chelicerate, the oribatid mite Archegozetes longisetosus, were examined to establish homology of chelicerate and insect head segments and to investigate claims that the chelicerate deutocerebral segment has been reduced or lost. engrailed (en) expression, which has been used to demonstrate the presence of segments in insects, fails to demonstrate a reduced deutocerebral segment. Expression patterns of the chelicerate homologs of the Drosophila genes Antennapedia (Antp), Sex combs reduced (Scr), Deformed (Dfd), proboscipedia (pb), and orthodenticle (otd) confirm direct correspondence of head segments. The chelicerate deutocerebral segment has not been reduced or lost. We make further inferences concerning the evolution of heads and Hox genes in arthropods.
摘要
为了确定螯肢动物和昆虫头部节段的同源性，并研究有关螯肢动物第二脑节段已减少或消失的说法，我们检测了模式螯肢动物——甲螨长栉甲螨（Archegozetes longisetosus）中六个含同源异型框基因的表达模式。用于证明昆虫中节段存在的engrailed（en）基因表达，未能证明第二脑节段减少。果蝇基因触角足（Antp）、性梳减少（Scr）、变形（Dfd）、触须足（pb）和正齿（otd）的螯肢动物同源物的表达模式证实了头部节段的直接对应关系。螯肢动物的第二脑节段并未减少或消失。我们对节肢动物头部和Hox基因的进化做了进一步推断。
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