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Circadian rhythms in Mexican blind cavefish Astyanax mexicanus in the lab and in the field.

Abstract：

:Biological clocks have evolved as an adaptation to life on a rhythmic planet, synchronising physiological processes to the environmental light-dark cycle. Here we examine circadian clock function in Mexican blind cavefish Astyanax mexicanus and its surface counterpart. In the lab, adult surface fish show robust circadian rhythms in per1, which are retained in cave populations, but with substantial alterations. These changes may be due to increased levels of light-inducible genes in cavefish, including clock repressor per2. From a molecular standpoint, cavefish appear as if they experience 'constant light' rather than perpetual darkness. Micos River samples show similar per1 oscillations to those in the lab. However, data from Chica Cave shows complete repression of clock function, while expression of several light-responsive genes is raised, including DNA repair genes. We propose that altered expression of light-inducible genes provides a selective advantage to cavefish at the expense of a damped circadian oscillator.

journal_name

Nat Commun

journal_title

Nature communications

authors

Beale A,Guibal C,Tamai TK,Klotz L,Cowen S,Peyric E,Reynoso VH,Yamamoto Y,Whitmore D

doi

10.1038/ncomms3769

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

2769

issn

2041-1723

pii

ncomms3769

journal_volume

4

pub_type

杂志文章

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