Conventional methods of long range restriction mapping for analysis of the genomic DNA structure failed in Yql 1, because single-copy DNA probes for blot hybridization analyses are rare and the rate of DNA methylation is high in this Y region. Numerous repetitive sequence blocks of unknown extensions are scattered throughout Yql 1 and a patchwork of X-Y homologous DNA blocks were found by different investigators. Therefore, our approach towards a molecular analysis of this Y region reduced this complexity by performing first its molecular analysis in YAC clones mapping to Yq11. YACs contain only a part of the whole Yq11 DNA structure. In this paper, we present our first results of this approach based on quantitative blot analysis of 51 DNA loci in 67 YAC clones. The YACs were isolated from the three CEPH libraries and mapped to a contig of 13 Mb from proximal to distal Yq11 with aid of a detailed interval map. In distal Yq11, our analysis revealed the presence of local amplification events of different DNA domains. A model of their possible arrangement is presented.

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