miRNA regulation of Sdf1 chemokine signaling provides genetic robustness to germ cell migration.

Abstract:

:microRNAs (miRNAs) function as genetic rheostats to control gene output. Based on their role as modulators, it has been postulated that miRNAs canalize development and provide genetic robustness. Here, we uncover a previously unidentified regulatory layer of chemokine signaling by miRNAs that confers genetic robustness on primordial germ cell (PGC) migration. In zebrafish, PGCs are guided to the gonad by the ligand Sdf1a, which is regulated by the sequestration receptor Cxcr7b. We find that miR-430 regulates sdf1a and cxcr7 mRNAs. Using target protectors, we demonstrate that miR-430-mediated regulation of endogenous sdf1a (also known as cxcl12a) and cxcr7b (i) facilitates dynamic expression of sdf1a by clearing its mRNA from previous expression domains, (ii) modulates the levels of the decoy receptor Cxcr7b to avoid excessive depletion of Sdf1a and (iii) buffers against variation in gene dosage of chemokine signaling components to ensure accurate PGC migration. Our results indicate that losing miRNA-mediated regulation can expose otherwise buffered genetic lesions leading to developmental defects.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Staton AA,Knaut H,Giraldez AJ

doi

10.1038/ng.758

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

204-11

issue

3

eissn

1061-4036

issn

1546-1718

pii

ng.758

journal_volume

43

pub_type

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