Origin of a novel protein-coding gene family with similar signal sequence in Schistosoma japonicum.

Abstract:

BACKGROUND:Evolution of novel protein-coding genes is the bedrock of adaptive evolution. Recently, we identified six protein-coding genes with similar signal sequence from Schistosoma japonicum egg stage mRNA using signal sequence trap (SST). To find the mechanism underlying the origination of these genes with similar core promoter regions and signal sequence, we adopted an integrated approach utilizing whole genome, transcriptome and proteome database BLAST queries, other bioinformatics tools, and molecular analyses. RESULTS:Our data, in combination with database analyses showed evidences of expression of these genes both at the mRNA and protein levels exclusively in all developmental stages of S. japonicum. The signal sequence motif was identified in 27 distinct S. japonicum UniGene entries with multiple mRNA transcripts, and in 34 genome contigs distributed within 18 scaffolds with evidence of genome-wide dispersion. No homolog of these genes or similar domain was found in deposited data from any other organism. We observed preponderance of flanking repetitive elements (REs), albeit partial copies, especially of the RTE-like and Perere class at either side of the duplication source locus. The role of REs as major mediators of DNA-level recombination leading to dispersive duplication is discussed with evidence from our analyses. We also identified a stepwise pathway towards functional selection in evolving genes by alternative splicing. Equally, the possible transcription models of some protein-coding representatives of the duplicons are presented with evidence of expression in vitro. CONCLUSION:Our findings contribute to the accumulating evidence of the role of REs in the generation of evolutionary novelties in organisms' genomes.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Mbanefo EC,Chuanxin Y,Kikuchi M,Shuaibu MN,Boamah D,Kirinoki M,Hayashi N,Chigusa Y,Osada Y,Hamano S,Hirayama K

doi

10.1186/1471-2164-13-260

subject

Has Abstract

pub_date

2012-06-20 00:00:00

pages

260

issn

1471-2164

pii

1471-2164-13-260

journal_volume

13

pub_type

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