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| Content Provider | Springer Nature Link |
|---|---|
| Author | McKee, Bruce D. Hong, Chia sin Das, Suchita |
| Copyright Year | 2000 |
| Abstract | Mapping of pairing sites involved in meiotic homolog disjunction in Drosophilahas led to conflicting hypotheses about the nature of such sites and the role of heterochromatin in meiotic pairing. In the female-specific distributive system, pairing regions appear to be exclusively heterochromatic and map to broad regions encompassing many different sequences. In male meiosis, autosomal pairing sites appear to be distributed broadly within euchromatin but to be absent from heterochromatin, whereas the X-pairing site maps in the centric heterochromatin. The X site has been shown to coincide with the intergenic spacer (IGS) repeats within the rDNA arrays shared between the X and Y. It has not been clear whether the heterochromatic location of this pairing site has any significance. A novel assay for genic modifiers of X–Y chromosome pairing was developed based on the intermediate nondisjunction levels observed in males whose X chromosome lacks the native pairing site but contains two transgenic insertions of single rDNA genes. This assay was used to test several mutations in Su(var)(Suppressor of position effect variegation), PcG(Polycomb-Group) recombination defective, and repair-defective genes. No strong effects on disjunction were seen. However, the tests did uncover several mutations that suppress or enhance the meiotic drive (distorted X-Y recovery ratio) that accompanies X–Y pairing failure. |
| Starting Page | 77 |
| Ending Page | 93 |
| Page Count | 17 |
| File Format | |
| ISSN | 00166707 |
| Journal | Genetica |
| Volume Number | 109 |
| Issue Number | 1-2 |
| e-ISSN | 15736857 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 2000-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Human Genetics Plant Genetics & Genomics Animal Genetics and Genomics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Plant Science Medicine Animal Science and Zoology Insect Science |
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