BIME2, a novel gene required for interhomolog meiotic recombination in the protist model organism Tetrahymena.

ABSTRACT: Meiotic recombination is initiated by DNA double-strand breaks (DSBs). Most DSBs are converted into nonreciprocal exchanges (gene conversions) or crossovers (COs) between sister chromatids. Only a minority of DSBs are processed toward interhomolog COs, the precursors of the chiasmata that connect homologous chromosomes. Dmc1, the meiosis-specific paralog of the universal recombination protein Rad51, is required for interhomolog COs; in its absence, univalents are primarily formed. Here, we report a ciliate-specific novel meiotic gene, BIME2, which also promotes interhomolog crossing over. In the bime2Δ mutant, DSBs are formed and repaired normally, but bivalent formation is strongly reduced. Bime2 protein forms foci on chromatin during meiotic prophase, and chromatin localization of Bime2

SUBMITTER: Shodhan A 

PROVIDER: S-EPMC5662671 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature