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Complete, precise, and innocuous loss of multiple introns in the currently intronless, active cathepsin L-like genes, and inference from this event.

Abstract：

:Retrotransposition typically generates pseudogenes. Here we demonstrate a different fate of the retro-processed genes through a novel mechanism in which the retro-processed genes still maintain their sequence intactness and the original functions. We show that the shrimp cathepsin L (CatL) gene MeCatL has lost all of its five introns. Also, ProEPB, the ancestor of the CatL-like barley EPBs and rice REP1, has lost all of its three introns. The multiple introns in a gene might have been eliminated simultaneously and precisely at the original locus for the CatL-like genes of shrimp, barley, rice, Drosophila, and Theileria. We reason that retrotransposition is not responsible for the generation of a processed active intronless (PAI) gene when the gene product retains its sequence intactness and its original function. We propose that double-strand-break repair (DSBR) machinery might play a role in cDNA-mediated homologous recombination (cDMHR) that causes the loss of introns. The cDMHR/DSBR pathway is probably a fundamental mechanism for intron loss in PAI genes and in some asymmetric-intron genes.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Hu KJ,Leung PC

doi

10.1016/j.ympev.2005.09.005

keywords:

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

685-96

issue

3

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(05)00291-5

journal_volume

38

pub_type

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