RsaI repetitive DNA in Buffalo Bubalus bubalis representing retrotransposons, conserved in bovids, are part of the functional genes

BMC Genomics

Research Article

Deepali Pathak¹  Sher Ali¹ 

[1] Molecular Genetics Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, 067, New Delhi -110, India;

关键词: Long Terminal Repeat;    Bovine Genome;    Sine Element;    Sheep Genome;    RsaI Enzyme;   

DOI  :  10.1186/1471-2164-12-338

 received in 2011-04-06, accepted in 2011-07-01,  发布年份 2011

来源: Springer

【 摘 要 】

BackgroundRepetitive sequences are the major components of the eukaryotic genomes. Association of these repeats with transcribing sequences and their regulation in buffalo Bubalus bubalis has remained largely unresolved.ResultsWe cloned and sequenced RsaI repeat fragments pDp1, pDp2, pDp3, pDp4 of 1331, 651, 603 and 339 base pairs, respectively from the buffalo, Bubalus bubalis. Upon characterization, these fragments were found to represent retrotransposons and part of some functional genes. The resultant clones showed cross hybridization only with buffalo, cattle, goat and sheep genomic DNA. Real Time PCR, detected ~2 × 104 copies of pDp1, ~ 3000 copies of pDp2 and pDp3 and ~ 1000 of pDp4 in buffalo, cattle, goat and sheep genomes, respectively. RsaI repeats are transcriptionally active in somatic tissues and spermatozoa. Accordingly, pDp1 showed maximum expression in lung, pDp2 and pDp3 both in Kidney, and pDp4 in ovary. Fluorescence in situ hybridization showed repeats to be distributed all across the chromosomes.ConclusionsThe data suggest that RsaI repeats have been incorporated into the exonic regions of various transcribing genes, possibly contributing towards the architecture and evolution of the buffalo and related genomes. Prospects of our present work in the context of comparative and functional genomics are highlighted.

【 授权许可】

CC BY   
© Pathak and Ali; licensee BioMed Central Ltd. 2011