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Characterizing the regulation and function of Zip1 in Saccharomyces cerevisiae meiosis

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posted on 2023-06-09, 01:10 authored by Dijue Sun
Meiosis is characterized by one round of DNA replication followed by two successive rounds of cell division, resulting in a halving of the genome. During meiotic prophase I, many events occur to allow faithful chromosome segregation. At the chromosomal level, homologs align and become closely juxtaposed along their entire lengths via a proteinaceous structure called the synaptonemal complex (SC). DNA double-strand breaks are induced during prophase I, resulting in the formation of crossover between homologs, which leads to the correct segregation during meiosis I. A well-characterized protein, termed Zip1, is the major component of the SC. Zip1 is known to involve in several different processes of meiosis. Firstly, Zip1 is involved during non- homologous centromere coupling. Secondly, Zip1 synapse homologs together. Thirdly, Zip1 promotes crossing over during prophase I as well as required for interference. The work described in this thesis has characterized the functions and regulation of several Zip1-phospho mutants during meiosis. In particular, Zip1-T114 was shown to involve partially during non-homologous centromere coupling. Zip1-S144 is a putative consensus site for Cdc5 phosphorylation and was found to have a role in SC disassembly. Zip1 has also been known to involve in non-exchange chromosome segregation (NECS). The work described here used time lapse imaging to further study the characteristics of NECS. This study has generated another homeologous chromosome in SK1 strain background. This homeologous chromosome diploid contains one chromosome III from Saccharomyces cerevisiae and one chromosome III from Saccharomyces paradoxus. Both species share 85% homology. Using live cell imaging has revealed that the NECS is very dynamic. This dynamic movement distinguishes from exchange chromosome segregation where stable centromere pairing between homologs was observed. Therefore a model has proposed for NECS, whereby non-exchange centromeres constant been associate and dissociate from prophase until anaphase segregation during meiosis I.

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  • Published version

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302.0

Department affiliated with

  • Biochemistry Theses

Qualification level

  • doctoral

Qualification name

  • phd

Language

  • eng

Institution

University of Sussex

Full text available

  • Yes

Legacy Posted Date

2016-06-02

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