Format

Send to

Choose Destination
See comment in PubMed Commons below
Genomics. 2004 May;83(5):852-72.

Extensive duplications of phototransduction genes in early vertebrate evolution correlate with block (chromosome) duplications.

Author information

1
Department of Neuroscience, Unit of Pharmacology, Uppsala University, Box 593, SE-751 24 Uppsala, Sweden.

Abstract

Many gene families in mammals have members that are expressed more or less uniquely in the retina or differentially in specific retinal cell types. We describe here analyses of nine such gene families with regard to phylogenetic relationships and chromosomal location. The families are opsins, G proteins (alpha, beta, and gamma subunits), phosphodiesterases type 6, cyclic nucleotide-gated channels, G-protein-coupled receptor kinases, arrestins, and recoverins. The results suggest that multiple new gene copies arose in all of these families very early in vertebrate evolution during a period with extensive gene duplications. Many of the new genes arose through duplications of large chromosome regions (blocks of genes) or even entire chromosomes, as shown by linkage with other gene families. Some of the phototransduction families belong to the same duplicated regions and were thus duplicated simultaneously. We conclude that gene duplications in early vertebrate evolution probably helped facilitate the specialization of the retina and the subspecialization of different retinal cell types.

PMID:
15081115
DOI:
10.1016/j.ygeno.2003.11.008
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Support Center