Impact of trisomy on fertility and meiosis in male mice
| Autor: | E. Akeson, M. T. Davisson, J. Farley, C. Schmidt, B. Harris, Mary Ann Handel |
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| Rok vydání: | 2006 |
| Předmět: |
Male
Sterility Gene Dosage Aneuploidy Trisomy Breeding Biology Mice Prophase Meiosis Semen Copulation Testis medicine Animals Infertility Male Genetics Sperm Count Synaptonemal Complex Rehabilitation Obstetrics and Gynecology Chromosome medicine.disease Chromosomes Mammalian Spermatozoa Synaptonemal complex Fertility Reproductive Medicine Vagina Sperm Motility Chromosome abnormality Female |
| Zdroj: | Human Reproduction. 22:468-476 |
| ISSN: | 1460-2350 0268-1161 |
| DOI: | 10.1093/humrep/del397 |
| Popis: | Background Chromosomal abnormalities frequently are associated with impairment or arrest of spermatogenesis in mammals but are compatible with fertility in female carriers of the same anomaly. In the case of trisomy, mice have extra genomic DNA as well as the chromosomal abnormality, usually present as an extra, unpaired chromosome. Thus, impairment of spermatogenesis in trisomic males could be due to the presence of extra genomic material (i.e. triplicated genes) or due to the chromosomal abnormality and presence of an unpaired chromosome in meiosis. Methods In this study, fertility and chromosomal pairing configurations during meiotic prophase were analysed in male mice trisomic for different segments of the genome. Four have an extra segmental or tertiary trisomic chromosome--Ts(17(16))65Dn, Ts(10(16))232Dn, Ts(12(17))4Rk and Ts(4(17))2Lws--and one has the triplicated segment attached to another chromosome--Ts(16C-tel)1Cje. Ts(17(16))65Dn and Ts(16C-tel)1Cje have similar gene content triplication and differ primarily in whether the extra DNA is in an extra chromosome or not. Results The presence of an intact extra chromosome, rather than trisomy per se, is associated with male sterility. Additionally, sterility is correlated with a high frequency of association of the unpaired chromosome with the XY body, which contains the largely unpaired X and Y chromosomes. Conclusions Intact extra chromosomes disrupt spermatogenesis, and unpaired chromosomes establish a unique chromatin territory within meiotic nuclei. |
| Databáze: | OpenAIRE |
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