Role of the ABC transporter Mdr49 in Hedgehog signaling and germ cell migration.

TitleRole of the ABC transporter Mdr49 in Hedgehog signaling and germ cell migration.
Publication TypeJournal Article
Year of Publication2016
AuthorsDeshpande, G, Manry, D, Jourjine, N, Mogila, V, Mozes, H, Bialistoky, T, Gerlitz, O, Schedl, P
Date Published2016 Jun 15
KeywordsAlleles, Animals, ATP Binding Cassette Transporter, Subfamily B, Cell Movement, Cholesterol, Drosophila melanogaster, Drosophila Proteins, Embryo, Nonmammalian, Epidermal Cells, Epidermis, Epistasis, Genetic, Feeding Behavior, Gene Duplication, Gene Expression Regulation, Developmental, Germ Cells, Hedgehog Proteins, Homozygote, Ligands, Mutation, Signal Transduction, Wings, Animal, Zygote

<p>Coalescence of the embryonic gonad in Drosophila melanogaster requires directed migration of primordial germ cells (PGCs) towards somatic gonadal precursor cells (SGPs). It was recently proposed that the ATP-binding cassette (ABC) transporter Mdr49 functions in the embryonic mesoderm to facilitate the transmission of the PGC attractant from the SGPs; however, the precise molecular identity of the Mdr49-dependent guidance signal remained elusive. Employing the loss- and gain-of-function strategies, we show that Mdr49 is a component of the Hedgehog (hh) pathway and it potentiates the signaling activity. This function is direct because in Mdr49 mutant embryos the Hh ligand is inappropriately sequestered in the hh-expressing cells. Our data also suggest that the role of Mdr49 is to provide cholesterol for the correct processing of the Hh precursor protein. Supporting this conclusion, PGC migration defects in Mdr49 embryos are substantially ameliorated by a cholesterol-rich diet.</p>

Alternate JournalDevelopment
PubMed ID27122170
PubMed Central IDPMC4920174
Grant ListR01 GM110015 / GM / NIGMS NIH HHS / United States