title: Investigating the Interplay between Sister Chromatid Cohesion and Homolog Pairing in Drosophila Nuclei.
abstract: Following DNA replication, sister chromatids must stay connected for the remainder of the cell cycle in order to ensure accurate segregation in the subsequent cell division. This important function involves an evolutionarily conserved protein complex known as cohesin; any loss of cohesin causes premature sister chromatid separation in mitosis. Here, we examined the role of cohesin in sister chromatid cohesion prior to mitosis, using fluorescence in situ hybridization (FISH) to assay the alignment of sister chromatids in interphase Drosophila cells. Surprisingly, we found that sister chromatid cohesion can be maintained in G2 with little to no cohesin. This capacity to maintain cohesion is widespread in Drosophila, unlike in other systems where a reduced dependence on cohesin for sister chromatid segregation has been observed only at specific chromosomal regions, such as the rDNA locus in budding yeast. Additionally, we show that condensin II antagonizes the alignment of sister chromatids in interphase, supporting a model wherein cohesin and condensin II oppose each other's functions in the alignment of sister chromatids. Finally, because the maternal and paternal homologs are paired in the somatic cells of Drosophila, and because condensin II has been shown to antagonize this pairing, we consider the possibility that condensin II-regulated mechanisms for aligning homologous chromosomes may also contribute to sister chromatid cohesion.
authors.affiliation: Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America.
authors.forename: T Niroshini
authors.initials: TN
authors.lastname: Senaratne
authors.affiliation: Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America.
authors.forename: Eric F
authors.initials: EF
authors.lastname: Joyce
authors.affiliation: Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America.
authors.forename: Son C
authors.identifier: 0000-0003-2187-1027
authors.initials: SC
authors.lastname: Nguyen
authors.affiliation: Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America.
authors.forename: C-Ting
authors.initials: CT
authors.lastname: Wu
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics*; D000818:Animals; D002467:Cell Nucleus / Q000235:genetics*; D002842:Chromatids / Q000235:genetics; D020090:Chromosome Segregation / Q000235:genetics; D002875:Chromosomes / Q000235:genetics*; D004261:DNA Replication / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D004331:Drosophila melanogaster / Q000235:genetics; D017404:In Situ Hybridization, Fluorescence; D008677:Metaphase / Q000235:genetics; D008938:Mitosis / Q000235:genetics; D046912:Multiprotein Complexes / Q000235:genetics*; D034622:RNA Interference; D012854:Sister Chromatid Exchange / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; D046912:Multiprotein Complexes; C108312:condensin complexes; D000251:Adenosine Triphosphatases