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Autoimmune-polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED, PGD type I) is an autosomal recessive disease enriched in the Finnish population. Previously, we have assigned APECED to a 2.6-cM interval on chromosome 21q22.3 by linkage analysis in 14 Finnish families. This subtelomeric region of 21q22.3 seems to have sequence features resulting in its under-representation in large insert genomic libraries, and only a few large insert clones have been available for positional cloning to date. Here, we report the refined localization of the APECED gene and a visual physical map of 800 kb covering the critical chromosomal region for the gene. In the construction of the physical map, the recently developed fiber FISH techniques were essential for the orientation of the cosmid PI, PAC, and BAC clones in relation to each other. We also localized two cDNAs within this genomic region by fiber FISH combined with the highly sensitive tyramide-based detection method. These data will facilitate the final cloning of the APECED gene and any other novel gene in this complex genomic region.

genome research

High-Resolution Physical and Transcriptional Mapping of the Autoimmune Polyendocrinopathy–Candidiasis–Ectodermal Dystrophy Locus on Chromosome 21q22.3 by FISH