Structure of the Y chromosomal Su(ste) locus in Drosophila melanogaster and evidence for localized recombination among repeats

Article Abstract:

Restriction analysis of both native and cloned genomic DNA was used to study the structure of the Suppressor of Stellate (SuSte) locus on the Y chromosome of Drosophila melanogaster. The locus is composed of short subarrays of tandem repeats and the variants measured between 2.8 and 2.5 kb. Moreover, the restriction variants tended to cluster together in random order. The findings suggest that the recombination among tandem (SuSte) repeats tends to occur mostly between close neighbors. In addition, gene conversion seemed to be the primary recombinational mechanism among the repeats.

Genetic recombination

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Evidence that intergenic spacer repeats of Drosophila melanogaster rRNA genes function as X-Y pairing sites in male meiosis, and a general model for achiasmatic pairing

Article Abstract:

The pairing of the X and the Y chromosomes of Drosophila melanogaster males during the metaphase stage of the first reduction division is mediated by nucleolus organizers in the heterochromatin region of the X chromosome and near the centromere of the Y chromosome. Genetic studies of the region revealed that the sequences responsible for the pairing are intergenic spacer elements. The spacer elements are repeats measuring 240 base pairs. Pairing ability of the non-homologous X and Y chromosomes was found to be proportional to the length of this spacer element.

Sex chromosomes

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The Y chromosome of Drosophila melanogaster contains a distinctive subclass of Het-A related repeats

Article Abstract:

Non-telomeric sequences were compared with Het-A elements known to be on the telomeres of other chromosomes. The Y-associated sequences 356 and 665 were used. Differences were noted in the structure although identity of between-cluster sequences for both were greater than 80%. Translocation analysis showed that repeat clusters near the ends of the arms of the Y chromosomes were similar to those of other Drosophila stocks studied. It is possible that Het-A sequences take part in heterochromatin formation.

Telomeres

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