RRC ID 33070
Author Bartoletti M, Rubin T, Chalvet F, Netter S, Dos Santos N, Poisot E, Paces-Fessy M, Cumenal D, Peronnet F, Pret AM, Théodore L.
Title Genetic basis for developmental homeostasis of germline stem cell niche number: a network of Tramtrack-Group nuclear BTB factors.
Journal PLoS One
Abstract The potential to produce new cells during adult life depends on the number of stem cell niches and the capacity of stem cells to divide, and is therefore under the control of programs ensuring developmental homeostasis. However, it remains generally unknown how the number of stem cell niches is controlled. In the insect ovary, each germline stem cell (GSC) niche is embedded in a functional unit called an ovariole. The number of ovarioles, and thus the number of GSC niches, varies widely among species. In Drosophila, morphogenesis of ovarioles starts in larvae with the formation of terminal filaments (TFs), each made of 8-10 cells that pile up and sort in stacks. TFs constitute organizers of individual germline stem cell niches during larval and early pupal development. In the Drosophila melanogaster subgroup, the number of ovarioles varies interspecifically from 8 to 20. Here we show that pipsqueak, Trithorax-like, batman and the bric-à-brac (bab) locus, all encoding nuclear BTB/POZ factors of the Tramtrack Group, are involved in limiting the number of ovarioles in D. melanogaster. At least two different processes are differentially perturbed by reducing the function of these genes. We found that when the bab dose is reduced, sorting of TF cells into TFs was affected such that each TF contains fewer cells and more TFs are formed. In contrast, psq mutants exhibited a greater number of TF cells per ovary, with a normal number of cells per TF, thereby leading to formation of more TFs per ovary than in the wild type. Our results indicate that two parallel genetic pathways under the control of a network of nuclear BTB factors are combined in order to negatively control the number of germline stem cell niches.
Volume 7(11)
Pages e49958
Published 2012-11-21
DOI 10.1371/journal.pone.0049958
PII PONE-D-12-25517
PMID 23185495
PMC PMC3503823
MeSH Animals DNA-Binding Proteins* / genetics DNA-Binding Proteins* / metabolism Drosophila Proteins* / genetics Drosophila Proteins* / metabolism Drosophila melanogaster / genetics Drosophila melanogaster / growth & development Female Gene Dosage / genetics Gene Expression Regulation, Developmental Germ Cells / cytology Germ Cells / growth & development Homeostasis / genetics Homeostasis / physiology Morphogenesis Nuclear Proteins* / genetics Nuclear Proteins* / metabolism Ovary / cytology Ovary / growth & development Stem Cell Niche / genetics* Stem Cell Niche / physiology Transcription Factors* / genetics Transcription Factors* / metabolism
IF 2.74
Times Cited 12
Drosophila 2368R-1