Hagfish and lancelet fibrillar collagens reveal that type II collagen-based cartilage evolved in stem vertebrates

被引:53
|
作者
Zhang, GuangJun
Cohn, Martin J.
机构
[1] Univ Florida, Dept Zool, Gainesville, FL 32611 USA
[2] Univ Florida, Dept Anat & Cell Biol, Gainesville, FL 32611 USA
关键词
development; gene duplication; skeleton evolution; chordate; notochord;
D O I
10.1073/pnas.0605630103
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The origin of vertebrates was defined by evolution of a skeleton; however, little is known about the developmental mechanisms responsible for this landmark evolutionary innovation. In jawed vertebrates, cartilage matrix consists predominantly of type II collagen (Col2 alpha 1), whereas that of jawless fishes has long been thought to be noncollagenous. We recently showed that Col2 alpha 1 is present in lamprey cartilage, indicating that type II collagen-based cartilage evolved earlier than previously recognized. Here, we investigate the origin of vertebrate cartilage, and we report that hagfishes, the sister group to lampreys, also have Col2 alpha 1-based cartilage, suggesting its presence in the common ancestor of crown-group vertebrates. We go on to show that lancelets, a sister group to vertebrates, possess an ancestral clade A fibrillar collagen (ColA) gene that is expressed in the notochord. Together, these results suggest that duplication and diversification of C6lA genes at the chordate-vertebrate transition may underlie the evolutionary origin of vertebrate skeletal tissues.
引用
收藏
页码:16829 / 16833
页数:5
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