Properties of overlapping genes are conserved across microbial genomes.

Abstract:

:There are numerous examples from the genomes of viruses, mitochondria, and chromosomes that adjacent genes can overlap, sharing at least one nucleotide. Overlaps have been hypothesized to be involved in genome size minimization and as a regulatory mechanism of gene expression. Here we show that overlapping genes are a consistent feature (approximately one-third of all genes) across all microbial genomes sequenced to date, have homologs in more microbes than do non-overlapping genes, and are therefore likely more conserved. In addition, the size, phase (reading frame offset), and distribution, among other characteristics, of overlapping genes are most consistent with the hypothesis that overlaps function in the regulation of gene expression. The upstream sequences and conservation of overlapping orthologs of two model organisms from the genus Prochlorococcus that have significantly different GC-content, and therefore different nucleotide sequences for orthologs, are also consistent with small overlapping sequence regions and programmed shifts in reading frame as a common mechanism in the regulation of microbial gene expression.

journal_name

Genome Res

journal_title

Genome research

authors

Johnson ZI,Chisholm SW

doi

10.1101/gr.2433104

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

2268-72

issue

11

eissn

1088-9051

issn

1549-5469

pii

14/11/2268

journal_volume

14

pub_type

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