CIN4 — Brachypodium distachyon

Summary

Brachypodium distachyon gene CIN4 (BRADI_1G39270V3) encodes a ubiquitin-conjugating enzyme with histone H2B deubiquitinase, metallopeptidase, and ubiquitin-protein transferase activities, and is associated with the COP9 signalosome, proteasome, and Cul4-RING E3 ubiquitin ligase complexes. The gene is linked to DNA damage tolerance, protein polyubiquitination, endosomal transport, and regulation of photomorphogenesis and circadian clock entrainment. It is associated with abscisic acid and anthocyanin metabolism, strigolactone signaling, and shoot gravitropism. Associations include boron and zinc sensitivity, UV light sensitivity, photoperiod-sensitive flowering time, drought stress response, seed dormancy, leaf senescence, and floral transition. Studies of related genes in other species link the family to cold and salt stress tolerance, cell cycle progression, and grain dormancy, while wheat studies connect it to grain protein content and grain weight.