Premium
Steroid 21‐hydroxylase deficiency: Mutational spectrum in Denmark, three novel mutations, and in vitro expression analysis
Author(s) -
Ohlsson Gita,
Müller Jørn,
Skakkebæk Niels Erik,
Schwartz Marianne
Publication year - 1999
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/(sici)1098-1004(1999)13:6<482::aid-humu8>3.0.co;2-0
Subject(s) - biology , exon , mutagenesis , microbiology and biotechnology , intron , genetics , mutation , splice , 21 hydroxylase , rna splicing , gene , exon skipping , complementary dna , allele , splice site mutation , alternative splicing , rna
We have investigated 68 unrelated 21‐hydroxylase deficient Danish patients, representing 136 alleles, and determined the mutational spectrum of the CYP21 gene. The most frequent mutations detected were deletion of CYP21 and the splice mutation in intron 2 (I2‐splice). Segregation analysis showed evidence of a de novo mutation in each of two patients. Three novel mutations were detected: G64E in exon 1, Q262X in exon 7, and A362V in exon 8. G64E and A362V were introduced in the CYP21 cDNA by in vitro site‐directed mutagenesis, and the two corresponding proteins were transiently expressed in COS‐7 cells. The activity of 21‐hydroxylase was determined using the two hormone substrates 17‐hydroxyprogesterone and progesterone. The analysis showed no enzyme activity for any of the substrates, a result that correlates well with the severity of the patients' disease. Hum Mutat 13:482–486, 1999. © 1999 Wiley‐Liss, Inc.