1
|
Tan J, Song GD, Song JS, Ren SH, Li CL, Zheng ZY, Zhao WD. Locating a modifier gene of Ovum mutant through crosses between DDK and C57BL/6J inbred strains in mice. J Genet 2016; 95:297-302. [PMID: 27350672 DOI: 10.1007/s12041-016-0633-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A striking infertile phenotype has been discovered in the DDK strain of mouse. The DDK females are usually infertile when crossed with males of other inbred strains, whereas DDK males exhibit normal fertility in reciprocal crosses. This phenomenon is caused by mutation in the ovum (Om) locus on chromosome 11 and known as the DDK syndrome. Previously, some research groups reported that the embryonic mortality deviated from the semilethal rate in backcrosses between heterozygous (Om/+) females and males of other strains. This embryonic mortality exhibited an aggravated trend with increasing background genes of other strains. These results indicated that some modifier genes of Om were present in other strains. In the present study, a population of N₂2 (Om/+) females from the backcrosses between C57BL/6J (B6) and F₁ (B6♀ × DDK♂) was used to map potential modifier genes of Om. Quantitative trait locus showed that a major locus, namely Amom1 (aggravate modifier gene of Om 1), was located at the middle part of chromosome 9 in mice. The Amom1 could increase the expressivity of Om gene, thereby aggravating embryonic lethality when heterozygous (Om/+) females mated with males of B6 strain. Further, the 1.5 LOD-drop analysis indicated that the confidence interval was between 37.54 and 44.46 cM, ~6.92 cM. Amom1 is the first modifier gene of Om in the B6 background.
Collapse
Affiliation(s)
- Jing Tan
- Engineering College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, Henan, People's Republic of
| | | | | | | | | | | | | |
Collapse
|
2
|
Liu W, Wang L, Zhao W, Song G, Xu R, Wang G, Wang F, Li W, Lian J, Tian H, Wang X, Sun F. Phosphorylation of CDK2 at threonine 160 regulates meiotic pachytene and diplotene progression in mice. Dev Biol 2014; 392:108-16. [PMID: 24797635 DOI: 10.1016/j.ydbio.2014.04.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 03/31/2014] [Accepted: 04/26/2014] [Indexed: 12/20/2022]
Abstract
Telomere clustering is a widespread phenomenon among eukaryotes. However, the molecular mechanisms that regulate formation of telomere clustering in mammalian meiotic prophase I, are still largely unknown. Here, we show that CDK2, especially p39(cdk2), as a potential meiosis-specific connector interaction with SUN1 mediates formation of telomere clustering during mouse meiosis. The transition from CDK2 to p-CDK2 also regulates the progression from homologous recombination to desynapsis by interacting with MLH1. In addition, disappearance of CDK2 on the telomeres and of p-CDK2 on recombination sites, were observed in Sun1(-/-) mice and in pachytene-arrested hybrid sterile mice (pwk×C57BL/6 F1), respectively. These results suggest that transition from CDK2 to p-CDK2 plays a critical role for regulating meiosis progression.
Collapse
Affiliation(s)
- Wenjing Liu
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; College of Life Science and Technology, Southwest University of Science and Technology, Mianyang, Sichuan 621000, China
| | - Lu Wang
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Weidong Zhao
- Engineering College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou, Henan 450002, China
| | - Gendi Song
- Engineering College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou, Henan 450002, China
| | - Rener Xu
- Institute of Developmental Biology and Molecular Medicine and School of Life Science, Fudan University, Shanghai 200433, China
| | - Guishuan Wang
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Fei Wang
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Wenqing Li
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jie Lian
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Hui Tian
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaorong Wang
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Fei Sun
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China.
| |
Collapse
|