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Mol Reprod Dev. 2014 Sep;81(9):778-93. doi: 10.1002/mrd.22357. Epub 2014 Aug 22.

Transport in technicolor: mapping ATP-binding cassette transporters in sea urchin embryos.

Author information

1
Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California.

Abstract

One quarter of eukaryotic genes encode membrane proteins. These include nearly 1,000 transporters that translocate nutrients, signaling molecules, and xenobiotics across membranes. While it is well appreciated that membrane transport is critical for development, the specific roles of many transporters have remained cryptic, in part because of their abundance and the diversity of their substrates. Multidrug resistance ATP-binding cassette (ABC) efflux transporters are one example of cryptic membrane proteins. Although most organisms utilize these ABC transporters during embryonic development, many of these transporters have broad substrate specificity, and their developmental functions remain incompletely understood. Here, we review advances in our understanding of ABC transporters in sea urchin embryos, and methods developed to spatially and temporally map these proteins. These studies reveal that multifunctional transporters are required for signaling, homeostasis, and protection of the embryo, and shed light on how they are integrated into ancestral developmental pathways recapitulated in disease.

PMID:
25156004
PMCID:
PMC4162837
DOI:
10.1002/mrd.22357
[Indexed for MEDLINE]
Free PMC Article

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