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- W2088237310 abstract "Most cases of congenital adrenal hyperplasia, the inherited inability to synthesize cortisol, are caused by mutations in the steroid 21-hydroxylase gene (CYP21). Steroid 21-hydroxylase deficiency is unusual among genetic diseases in that approximately 95% of the mutant alleles have apparently been generated by recombination between a normally active gene (CYP21) and a linked pseudogene (CYP21P). Approximately 20% of mutant alleles carry DNA deletions of 30 kb that have presumably been generated by unequal meiotic crossing-over, whereas 75% carry one or more mutations in CYP21 that are normally found in the CYP21P pseudogene. These latter mutations are termed gene conversions, although the mechanism by which they are generated is not well understood. To assess the frequency at which these different recombination events occur, we have used PCR to detect de novo deletions and gene conversions in matched sperm and peripheral blood leukocyte DNA samples from normal individuals. Deletions with breakpoints in a 100-bp region in intron 2 and exon 3 were detected in sperm DNA samples with frequencies of approximately 1 in 10(5)-10(6) genomes but were never detected in the matching leukocyte DNA. Gene conversions in the same region occur in approximately 1 in 10(3)-10(5) genomes in both sperm and leukocyte DNA. These data suggest that whereas deletions occur exclusively in meiosis, gene conversions occur during both meiosis and mitosis, or perhaps only during mitosis. Thus, gene conversions must occur by a mechanism distinct from unequal crossing-over." @default.
- W2088237310 created "2016-06-24" @default.
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- W2088237310 date "1995-11-07" @default.
- W2088237310 modified "2023-10-13" @default.
- W2088237310 title "Gene conversions and unequal crossovers between CYP21 (steroid 21-hydroxylase gene) and CYP21P involve different mechanisms." @default.
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- W2088237310 doi "https://doi.org/10.1073/pnas.92.23.10796" @default.
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