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Protein Cell. 2016 Apr;7(4):236-249. doi: 10.1007/s13238-016-0254-9. Epub 2016 Mar 23.

The key role of CYC2 during meiosis in Tetrahymena thermophila.

Xu Q1,2,3, Wang R3, Ghanam AR3,4, Yan G5,6, Miao W5, Song X7,8,9.

Author information

1
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China.
2
CAS Center for Excellence in Molecular Cell Science, Shanghai, 200031, China.
3
School of Life Sciences, University of Science and Technology of China, Hefei, 230071, China.
4
Anatomy and Embryology Department, Suez Canal University, Ismailia, 41522, Egypt.
5
Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
6
University of Chinese Academy of Sciences, Beijing, 100049, China.
7
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China. songxy5@ustc.edu.cn.
8
CAS Center for Excellence in Molecular Cell Science, Shanghai, 200031, China. songxy5@ustc.edu.cn.
9
School of Life Sciences, University of Science and Technology of China, Hefei, 230071, China. songxy5@ustc.edu.cn.

Abstract

Meiotic recombination is carried out through a specialized pathway for the formation and repair of DNA double-strand breaks (DSBs) made by the Spo11 protein. The present study shed light on the functional role of cyclin, CYC2, in Tetrahymena thermophila which has transcriptionally high expression level during meiosis process. Knocking out the CYC2 gene results in arrest of meiotic conjugation process at 2.5-3.5 h after conjugation initiation, before the meiosis division starts, and in company with the absence of DSBs. To investigate the underlying mechanism of this phenomenon, a complete transcriptome profile was performed between wild-type strain and CYC2 knock-out strain. Functional analysis of RNA-Seq results identifies related differentially expressed genes (DEGs) including SPO11 and these DEGs are enriched in DNA repair/mismatch repair (MMR) terms in homologous recombination (HR), which indicates that CYC2 could play a crucial role in meiosis by regulating SPO11 and participating in HR.

KEYWORDS:

RNA-Seq; Tetrahymena thermophila; cyclin; homologous recombination; meiosis

PMID:
27008457
PMCID:
PMC4818844
DOI:
10.1007/s13238-016-0254-9
[Indexed for MEDLINE]
Free PMC Article

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