Osawa M, Horiuchi H, Tian W, Kaneko M. Divergent evolution of the prolactin-inducible protein gene and related genes in the mouse genome.
Gene 2004;
325:179-86. [PMID:
14697523 DOI:
10.1016/j.gene.2003.10.013]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The prolactin-inducible protein (PIP/GCDFP15) family consists of small secretory polypeptides that are found in various body fluids. In order to study evolutionary events to this family, we cloned member genes and analyzed their sequences. A database search revealed the presence of a novel paralogous gene on mouse chromosome 6q34 and a nonprocessed pseudogene adjacent to PIP on human chromosome 7q34. The mouse PIP and four related genes displayed higher nonsynonymous and synonymous substitution ratios in comparison to other mammalian PIP orthologues; furthermore, these genes exhibited distinct distributions among tissues such as seminal vesicle, colon, and mammary gland. A pair of duplicated genes could have existed prior to radiation to the human and rodents. While only PIP is active in the human lineage, species-specific gene duplications have given rise to functional variants in rodents. Adaptive evolution potentially has occurred among the PIP and its related genes in the mouse genome.
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