Chromosome cohesion - rings, knots, orcs and fellowship.
Sister-chromatid cohesion is essential for accurate chromosome segregation. A key discovery towards our understanding of sister-chromatid cohesion was made 10 years ago with the identification of cohesins. Since then, cohesins have been shown to be involved in cohesion in numerous organisms, from yeast to mammals. Studies of the composition, regulation and structure of the cohesin complex led to a model in which cohesin loading during S-phase establishes cohesion, and cohesin cleavage at the onset of anaphase allows sister-chromatid separation. However, recent studies have revealed activities that provide cohesion in the absence of cohesin. Here we review these advances and propose an integrative model in which chromatid cohesion is a result of the combined activities of multiple cohesion mechanisms.
Department of Pharmacology, UT-Southwestern Medical Center, 6001 Forest Park Rd, Dallas, TX75390, USA. Laura.Diaz-Martinez@UTSouthwestern.edu
Laura A
LA
Díaz-Martínez
Juan F
JF
Giménez-Abián
Duncan J
DJ
Clarke
D000818:Animals; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics / Q000378:metabolism*; D020090:Chromosome Segregation; D002875:Chromosomes / Q000235:genetics / Q000378:metabolism*; D004261:DNA Replication; D006801:Humans; D008540:Meiosis / Q000502:physiology; D049469:Meiotic Prophase I / Q000502:physiology; D008957:Models, Genetic; D051738:Origin Recognition Complex / Q000378:metabolism*; D016196:S Phase / Q000502:physiology; D012441:Saccharomyces cerevisiae; D012854:Sister Chromatid Exchange; D000097722:Cohesins
D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; D051738:Origin Recognition Complex; D000097722:Cohesins