Abstract:
:Cyanobacteria are among the most ancient organisms known to have circadian rhythms. The cpmA gene is involved in controlling the circadian output signal. We studied polymorphism and divergence of this gene in six populations of a stress-tolerant cyanobacterium, Chroococcidiopsis sp., sampled in extreme habitats across the globe. Despite high haplotype diversity (0.774), nucleotide diversity of cpmA is very low (π = 0.0034): the gene appears to be even more conserved than housekeeping genes. Even though the populations were sampled thousands kilometers apart, they manifested virtually no genetic differentiation at this locus (F(ST) = 0.0228). Using various tests for neutrality, we determined that evolution of cpmA significantly departures from the neutral model and is governed by episodic positive selection.
journal_name
Mol Biol Evoljournal_title
Molecular biology and evolutionauthors
Dvornyk V,Jahan ASdoi
10.1093/molbev/mss191subject
Has Abstractpub_date
2012-12-01 00:00:00pages
3899-907issue
12eissn
0737-4038issn
1537-1719pii
mss191journal_volume
29pub_type
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