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Open Access Highly Accessed Research article

Genome-level identification, gene expression, and comparative analysis of porcine β-defensin genes

Min-Kyeung Choi1, Minh Thong Le1, Dinh Truong Nguyen1, Hojun Choi1, Won Kim1, Jin-Hoi Kim1, Jungwan Chun2, Jiyeon Hyeon2, Kunho Seo2 and Chankyu Park1*

Author Affiliations

1 Department of Animal Biotechnology, Konkuk University, Hwayang-dong,, Kwangjin-gu, Seoul, 143-701, South Korea

2 College of Veterinary Medicine, Konkuk University, Seoul, South Korea

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BMC Genetics 2012, 13:98  doi:10.1186/1471-2156-13-98

Published: 15 November 2012

Abstract

Background

Beta-defensins (β-defensins) are innate immune peptides with evolutionary conservation across a wide range of species and has been suggested to play important roles in innate immune reactions against pathogens. However, the complete β-defensin repertoire in the pig has not been fully addressed.

Result

A BLAST analysis was performed against the available pig genomic sequence in the NCBI database to identify β-defensin-related sequences using previously reported β-defensin sequences of pigs, humans, and cattle. The porcine β-defensin gene clusters were mapped to chromosomes 7, 14, 15 and 17. The gene expression analysis of 17 newly annotated porcine β-defensin genes across 15 tissues using semi-quantitative reverse transcription polymerase chain reaction (RT-PCR) showed differences in their tissue distribution, with the kidney and testis having the largest pBD expression repertoire. We also analyzed single nucleotide polymorphisms (SNPs) in the mature peptide region of pBD genes from 35 pigs of 7 breeds. We found 8 cSNPs in 7 pBDs.

Conclusion

We identified 29 porcine β-defensin (pBD) gene-like sequences, including 17 unreported pBDs in the porcine genome. Comparative analysis of β-defensin genes in the pig genome with those in human and cattle genomes showed structural conservation of β-defensin syntenic regions among these species.

Keywords:
Antimicrobial peptide; β-defensins; Pigs; pBD; Pig genome; SNP