Open Access Research article

Expansion of the Bactericidal/Permeability Increasing-like (BPI-like) protein locus in cattle

Thomas T Wheeler1*, Kylie A Hood12, Nauman J Maqbool3, John C McEwan4, Colin D Bingle5 and Shaying Zhao6

Author Affiliations

1 Dairy Science and Technology Section, AgResearch Ruakura, Private Bag 3123, Hamilton, New Zealand

2 Wakefield Gastroenterology Centre, Wakefield Hospital, Private Bag 7909 Wellington, New Zealand

3 Bioinformatics, Mathematics & Statistics Section, Invermay, Private Bag 50034, Mosgiel, New Zealand

4 Animal Genomics Section, AgResearch, Invermay, Private Bag 50034, Mosgiel, New Zealand

5 Academic Unit of Respiratory Medicine, Division of Genomic Medicine, The University of Sheffield Medical School, M117, Royal Hallamshire Hospital Sheffield S10 2JF, UK

6 Department of Biochemistry and Molecular Biology, Institute of Bioinformatics, University of Georgia, Athens, Georgia, USA

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BMC Genomics 2007, 8:75  doi:10.1186/1471-2164-8-75

Published: 15 March 2007

Abstract

Background

Cattle and other ruminants have evolved the ability to derive most of their metabolic energy requirement from otherwise indigestible plant matter through a symbiotic relationship with plant fibre degrading microbes within a specialised fermentation chamber, the rumen. The genetic changes underlying the evolution of the ruminant lifestyle are poorly understood. The BPI-like locus encodes several putative innate immune proteins, expressed predominantly in the oral cavity and airways, which are structurally related to Bactericidal/Permeability Increasing protein (BPI). We have previously reported the expression of variant BPI-like proteins in cattle (Biochim Biophys Acta 2002, 1579, 92–100). Characterisation of the BPI-like locus in cattle would lead to a better understanding of the role of the BPI-like proteins in cattle physiology

Results

We have sequenced and characterised a 722 kbp segment of BTA13 containing the bovine BPI-like protein locus. Nine of the 13 contiguous BPI-like genes in the locus in cattle are orthologous to genes in the human and mouse locus, and are thought to play a role in host defence. Phylogenetic analysis indicates the remaining four genes, which we have named BSP30A, BSP30B, BSP30C and BSP30D, appear to have arisen in cattle through a series of duplications. The transcripts of the four BSP30 genes are most abundant in tissues associated with the oral cavity and airways. BSP30C transcripts are also found in the abomasum. This, as well as the ratios of non-synonymous to synonymous differences between pairs of the BSP30 genes, is consistent with at least BSP30C having acquired a distinct function from the other BSP30 proteins and from its paralog in human and mouse, parotid secretory protein (PSP).

Conclusion

The BPI-like locus in mammals appears to have evolved rapidly through multiple gene duplication events, and is thus a hot spot for genome evolution. It is possible that BSP30 gene duplication is a characteristic feature of ruminants and that the BSP30 proteins contribute to an aspect of ruminant-specific physiology.