title: Systematic reduction of cohesin differentially affects chromosome segregation, condensation, and DNA repair.
abstract: Cohesin's complex distribution on chromosomes and its implication in numerous cellular processes makes it an excellent paradigm for studying the relationship between the in vivo concentration of a protein and its in vivo function. Here, we report a method to generate systematic quantized reductions (QR) in the in vivo concentration of any yeast protein. With QR, we generate strains with 13% and 30% of wild-type levels of the limiting subunit of cohesin, Mcd1p/Scc1p/Rad21p. Reducing cohesin levels reveals a preferential binding of cohesin to pericentric regions over cohesin-associated regions (CAR) on chromosome arms. Chromosome condensation, repetitive DNA stability, and DNA repair are compromised by decreasing cohesin levels to 30% of wild-type levels. In contrast, sister-chromatid cohesion and chromosome segregation are unaffected even when cohesin levels are reduced to 13% of wild-type levels. The requirement for different in vivo cohesin concentrations to achieve distinct cohesin functions provides an explanation for how cohesin mutations can specifically lead to adult disorders such as Cornelia de Lange Syndrome and Roberts Syndrome without compromising the cell divisions needed for development and maturation. Our successful application of QR to cohesin suggests that QR is a powerful tool to study other proteins/pathways with multiple functions.
authors.affiliation: Howard Hughes Medical Institute, 3520 San Martin Drive, Baltimore, MD 21218, USA.
authors.forename: Jill M
authors.initials: JM
authors.lastname: Heidinger-Pauli
authors.forename: Ozlem
authors.initials: O
authors.lastname: Mert
authors.forename: Carol
authors.initials: C
authors.lastname: Davenport
authors.forename: Vincent
authors.initials: V
authors.lastname: Guacci
authors.forename: Douglas
authors.initials: D
authors.lastname: Koshland
mesh_terms: D000328:Adult; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002455:Cell Division / Q000502:physiology; D002503:Centromere / Q000378:metabolism; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics / Q000378:metabolism*; D020090:Chromosome Segregation; D002875:Chromosomes / Q000378:metabolism*; D004260:DNA Repair; D003635:De Lange Syndrome / Q000235:genetics; D006801:Humans; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D000097722:Cohesins
chemical_list: D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; D029701:Saccharomyces cerevisiae Proteins; D000097722:Cohesins
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