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- W2416155146 abstract "Background Mutations in CYP21A2, the gene encoding 21-hydroxylase, are identified in >80% of individuals with congenital adrenal hyperplasia (CAH). CYP21A2 and its highly homologous pseudogene, CYP21A1P , reside in close proximity; as a result >90% of CYP21A2 mutation-containing alleles are caused by gene conversion from CYP21A1P or CYP21A2 deletions arising from non-allelic homologous recombination. Further, CYP21A2 duplications exist and provide a source of false negative and false positive results as carriers of a CYP21A2 deletion may be masked by a CYP21A2 duplication on the opposite allele (2+0 configuration) or carriers of a point mutation may also carry a second non-mutated CYP21A2 in cis. Objectives The purpose of this study was to investigate the distribution of CYP21A2 mutations identified from molecular genetic tested CAH individuals and determine the frequency of 2+0 carriers in a control population. Methods A total of 469 CAH individuals were screened for CYP21A2 mutation by MLPA and common mutation and/or sequencing analysis. A PCR-based assay was developed and to detect 2+0 CYP21A2 deletion carriers. Results The p. V282L, c.293–13A/C >G, and CYP21A2 gene deletion were the most frequent mutations identified in CAH. Cases with two independent mutations in cis and mutation-containing CYP21A2 duplications were observed. No silent 2+0 CYP21A2 deletion carriers were identified in our control population. Conclusions Segregation and copy number analysis are critical in CYP21A2 testing. A PCR-based assay can be used to detect CYP21A2 duplications, although the 2+0 silent carrier frequency is rare." @default.
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- W2416155146 date "2015-11-01" @default.
- W2416155146 modified "2023-09-27" @default.
- W2416155146 title "MG-125 CYP21A2 mutation spectrum in congenital adrenal hyperplasia identified from molecular genetic testing" @default.
- W2416155146 doi "https://doi.org/10.1136/jmedgenet-2015-103578.25" @default.
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