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 N2 (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.
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This work was supported by National Natural Science Foundation of China (no. 30570267).
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[Tan J., Song G. D., Song J. S., Ren S. H., Li C. L., Zheng Z. Y. and Zhao W. D. 2016 Locating a modifier gene of Ovum mutant through crosses between DDK and C57BL/6J inbred strains in mice. J. Genet. 95, xx–xx]
Jing Tan and Gendi Song contributed equally to this work.
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TAN, J., SONG, G.D., SONG, J.S. et al. Locating a modifier gene of Ovum mutant through crosses between DDK and C57BL/6J inbred strains in mice. J Genet 95, 297–302 (2016). https://doi.org/10.1007/s12041-016-0633-2
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DOI: https://doi.org/10.1007/s12041-016-0633-2