Drosophila Fragile X protein controls cellular proliferation by regulating cbl levels in the ovary

Dev Biol. 2009 Jun 1;330(1):83-92. doi: 10.1016/j.ydbio.2009.03.011. Epub 2009 Mar 21.

Abstract

FMRP is an RNA binding protein linked to the most common form of inherited mental retardation, Fragile X syndrome (FraX). In addition to severe cognitive deficits, FraX etiology includes postpubescent macroorchidism, which is thought to result from overproliferation. Using a Drosophila FraX model, we show that FMRP controls germline proliferation during oogenesis. dFmr1 null ovaries contain egg chambers with both fewer and supranumerary germ cells. The mutant germaria contain a significantly increased number of cyclin E and PhosphoHistone H3 positive cells, suggesting that loss of FMRP leads to defects in cell cycle progression. BrdU incorporation and flow cytometry data suggest that, in addition to proliferation, germline endoreplication and ploidy are also affected by the loss of FMRP during ovary development. Here we report that FMRP controls the levels of cbl mRNA in the ovary and that reducing cbl gene dosage by half rescues the dFmr1 oogenesis phenotypes. These data support a model whereby FMRP controls germline proliferation by regulating the expression of cbl in the developing ovary.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Cell Proliferation*
  • Cyclin E
  • Drosophila / embryology*
  • Drosophila / metabolism
  • Drosophila Proteins / genetics
  • Drosophila Proteins / metabolism*
  • Embryo, Nonmammalian / metabolism
  • Female
  • Flow Cytometry
  • Fragile X Mental Retardation Protein / genetics
  • Fragile X Mental Retardation Protein / metabolism*
  • Immunohistochemistry
  • Oogenesis
  • Ovary / metabolism*
  • Phenotype
  • Proto-Oncogene Proteins c-cbl / genetics*
  • Proto-Oncogene Proteins c-cbl / metabolism
  • RNA, Messenger / metabolism

Substances

  • Cyclin E
  • Drosophila Proteins
  • FMR1 protein, Drosophila
  • RNA, Messenger
  • Fragile X Mental Retardation Protein
  • Proto-Oncogene Proteins c-cbl
  • Cbl protein, Drosophila