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Amphioxus type I keratin cDNA and the evolution of intermediate filament genes

✍ Scribed by Luke, Graham N.; Holland, Peter W.H.

Book ID: 101228299
Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 256 KB
Volume: 285
Category: Article
ISSN: 0022-104X
DOI: 10.1002/(sici)1097-010x(19990415)285:1<50::aid-jez6>3.0.co;2-c

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✦ Synopsis

We report the cloning of an intermediate filament (IF) cDNA from the cephalochordate amphioxus that encodes a protein assignable to the type I keratin group. This is the first type I keratin reported from an invertebrate. Molecular phylogenetic analyses reveal that amphioxus also possesses a type II keratin, and that the genes encoding short-rod IF proteins underwent different patterns of duplication in vertebrates and their closest relatives, the cephalochordates. Extensive IF gene duplication and divergence may have facilitated the origin of new specialised cell types in vertebrates.

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