Positive selection on transposase genes of insertion sequences in the Crocosphaera watsonii genome.

ABSTRACT: Insertion sequences (ISs) are mobile elements that are commonly found in bacterial genomes. Here, the structural and functional diversity of these mobile elements in the genome of the cyanobacterium Crocosphaera watsonii WH8501 is analyzed. The number, distribution, and diversity of nucleotide and amino acid stretches with similarity to the transposase gene of this IS family suggested that this genome harbors many functional as well as truncated IS fragments. The selection pressure acting on full-length transposase open reading frames of these ISs suggested (i) the occurrence of positive selection and (ii) the presence of one or more positively selected codons. These results were obtained using three data sets of transposase genes from the same IS family that were collected based on the le

SUBMITTER: Mes TH 

PROVIDER: S-EPMC1636226 | biostudies-literature | 2006 Oct

REPOSITORIES: biostudies-literature