Journal
SCIENCE
Volume 287, Issue 5455, Pages 989-994Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.287.5455.989
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New proteins and modules have been invented throughout evolution. Gene birth dates in Caenorhabditis elegans range from the origins of cellular life through adaptation to a soil habitat. Possibly half are metazoan genes, having arisen sometime between the yeast-metazoan and nematode-chordate separations. These include basement membrane and cel adhesion molecules implicated in tissue organization. by contrast epithelial surfaces facing the environment have specialized components invented within the nematode lineage. Moreover, interstitial matrices were likely elaborated within the vertebrate lineage. A strategy for concerted evolution of new gene families, as well as conservation of adaptive genes, may underlie the differences between heterochromatin and euchromatin.
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