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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Hox cluster genomics in the horn shark, Heterodontus francisci
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Hox cluster genomics in the horn shark, Heterodontus francisci

机译:角鲨Heterodontus francisci中的Hox簇基因组学

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摘要

Reconstructing the evolutionary history of Hox cluster origins will lead to insights into the developmental and evolutionary signifi- cance of Hox gene clusters in vertebrate phylogeny and to their role in the origins of various vertebrate body plans. We have isolated two Hox clusters from the horn shark. Het6rodontus francisci. These have been sequenced and compared with one another and with other chordate Hox clusters. The results show that one of the horn shark clusters (HoxM) is orthologous to the mammalian HoxA cluster and shows a structural similarity to the amphioxus cluster, whereas the other shark cluster (HoxN) is , orthologous to the mammalian HoxD cluster based on cluster organization and a comparison with noncoding and Hox gene- coding sequences. The persistence of an identifiable HoxA clusterover an 800-miIlion-year divergence time demonstrates that the Hox gene clusters are highly integrated and structured geneticentities. The data presented herein identify many noncoding sequence motifs conserved over 800 milloion years that may func- tion as genetic control motifs essential to the developmental process.
机译:重建Hox簇起源的进化史将导致对脊椎动物系统发育中Hox基因簇的发育和进化意义及其在各种脊椎动物身体计划起源中的作用的认识。我们从角鲨中分离出两个Hox簇。 Het6rodontus francisci。已对这些序列进行了测序,并相互比较,并与其他chordate Hox簇进行了比较。结果表明,一个角鲨群(HoxM)与哺乳动物的HoxA集群是直系同源的,并且在结构上与两栖动物集群相似,而另一个鲨鱼集群(HoxN)与该哺乳动物的HoxD集群是直系的(基于集群组织)并与非编码和Hox基因编码序列进行比较。可识别的HoxA簇在800百万年的分歧时间内持续存在,这表明Hox基因簇是高度整合和结构化的遗传实体。本文提供的数据确定了超过800亿年保存的许多非编码序列基序,这些基序可以作为发育过程必不可少的遗传控制基序。

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