Abstract：
BACKGROUND:A prerequisite for a duplication to spread through and persist in a given population is retaining expression of both gene copies. Yet changing a gene's dosage is frequently detrimental to fitness. Consequently, dosage-sensitive genes are less likely to duplicate. However, in cases where the level of gene product is controlled, via negative feedback, by its own abundance, an increase in gene copy number can in principle be decoupled from an increase in protein while both copies remain expressed. Using data from the transcriptional networks of E. coli and S. cerevisiae, we test the hypothesis that genes under negative auto-regulation show enhanced duplicability. RESULTS:Controlling for several known correlates of duplicability, we find no statistically significant support in either E. coli or S. cerevisiae that transcription factors under negative auto-regulation hold a duplicability advantage over transcription factors with no auto-regulation. CONCLUSION:Based on the analysis of transcriptional networks in E. coli and S. cerevisiae, there is no evidence that negative auto-regulation has contributed, on a genome-wide scale, to the variability in gene family sizes in these species.
journal_name
BMC Evol Bioljournal_title
BMC evolutionary biologyauthors
Warnecke T,Wang GZ,Lercher MJ,Hurst LDdoi
10.1186/1471-2148-9-193subject
Has Abstractpub_date
2009-08-07 00:00:00pages
193issn
1471-2148pii
1471-2148-9-193journal_volume
9pub_type
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