Analysis of a hypomorphic mei-P26 mutation reveals coordination between developmental programming of germ cells and meiotic chromosome dynamics

Description

Terry and colleagues used a weakened fruit fly gene in 2026 to study how germ cell development and meiosis, the division that halves chromosome number for eggs and sperm, stay in step. Full loss of the gene mei-P26 causes tumor-like ovaries, but the weakened version left flies fertile enough to inspect chromosome behavior.

In mutants, about 60 percent of cell clusters carried markers of two stages at once, a sign that the switch out of ordinary division ran late. The protein scaffold that aligns chromosomes in meiosis rarely formed full tracks, appearing broken or in dots. Crossovers, the swaps that shuffle genes, still formed but landed in the wrong places, near chromosome centers rather than arms, and their spacing control weakened while their guarantee held. The authors propose that late exit from division lets dividing signals leak into meiosis and scramble its patterning.

Catalog record

Source: https://europepmc.org/article/MED/PMC13431882