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Multiple reorganizations of the lateral elements of the synaptonemal complex facilitate homolog segregation in Bombyx mori oocytes.
Xiang, Youbin; Tsuchiya, Dai; Yu, Zulin; Zhao, Xia; McKinney, Sean; Unruh, Jay; Slaughter, Brian; Lake, Cathleen M; Hawley, R Scott.
Afiliação
  • Xiang Y; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA.
  • Tsuchiya D; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA.
  • Yu Z; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA.
  • Zhao X; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA.
  • McKinney S; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA.
  • Unruh J; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA.
  • Slaughter B; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA.
  • Lake CM; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA.
  • Hawley RS; Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO 64110, USA; Department of Molecular and Integrative Physiology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, MO 66160, USA. Electronic address: rsh@stowers.org.
Curr Biol ; 34(2): 352-360.e4, 2024 01 22.
Article em En | MEDLINE | ID: mdl-38176417
ABSTRACT
Although Lepidopteran females build a synaptonemal complex (SC) in pachytene, homologs do not crossover, necessitating an alternative method of homolog conjunction. In Bombyx mori oocytes, the SC breaks down at the end of pachytene, and homolog associations are maintained by a large oocyte-specific structure, which we call the bivalent bridge (BB), connecting paired homologs. The BB is derived from at least some components of the SC lateral elements (LEs). It contains the HORMAD protein HOP1 and the LE protein SYCP2 and is formed by the fusion of the two LE derivatives. As diplotene progresses, the BB increases in width and acquires a layered structure with a thick band of HOP1 separating two layers of SYCP2. The HOP1 interacting protein, PCH2, joins the BB in mid-diplotene, and by late-diplotene, it lies in the middle of the HOP1 filament. This structure is maintained through metaphase I. SYCP2 and PCH2 are lost at anaphase I, and the BB no longer connects the separating homologs. However, a key component of the BB, HOP1, remains at the metaphase I plate. These changes in organization of the BB occur simultaneously with the movement of the kinetochore protein, DSN1, from within the BB at mid-diplotene to the edge of the homologs facing the poles by metaphase I. We view these data in context of models in which SC components and regulators can be repurposed to achieve different functions, a fascinating example of evolution achieving homolog conjunction in an alternative way with recycling of SC proteins.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Bombyx / Complexo Sinaptonêmico Limite: Animals Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Bombyx / Complexo Sinaptonêmico Limite: Animals Idioma: En Ano de publicação: 2024 Tipo de documento: Article