TY - JOUR
T1 - Functional analysis of four CYP21 mutations from Spanish patients with congenital adrenal hyperplasia
AU - Nunez, B. Scott
AU - Lobato, M. Natividad
AU - White, Perrin C.
AU - Meseguer, Anna
N1 - Funding Information:
We thank James Dennis for CHOP cells and Sergei Usonov for CYP21 antiserum. M.N.L. is a predoctoral fellow from the Basque Government (BFI 93064:1993-97). This work was supported by grants R37 DK37867 from the National Institutes of Health (P.C.W. and B.S.N.) and Fiss 94/1473 (M.N.L. and A.M.).
PY - 1999/9/7
Y1 - 1999/9/7
N2 - Deleterious mutations in the CYP21 (steroid 21-hydroxylase) gene cause congenital adrenal hyperplasia (CAH). These mutations usually result from recombinations between CYP21 and an adjacent pseudogene, CYP21P, including deletions and transfers of deleterious mutations from CYP21P to CYP21 (gene conversions). Additional rare mutations that are not gene conversions account for 5-10% of 21-hydroxylase deficiency alleles. Recently, four novel CYP21 point mutations leading to amino acid changes were identified in a population of 57 Spanish families with CAH. A nonsense mutation, K74X, was also identified. The enzymatic activities of 21-hydroxylase mutants G90V, G178A, G291C, and R354H were examined in transiently transfected CHOP cells using progesterone and 17α-hydroxyprogesterone as substrates. The G90V, G291C, and R354H mutations effectively eliminated 21-hydroxylase activity. However, the G178A mutant retained significant activity when 17α-hydroxyprogesterone was the substrate. These results correlate well with the identification of G90V, G291C, and R354H in patients with severe 'salt-wasting' disease and G178A in a patient with the milder simple virilizing form.
AB - Deleterious mutations in the CYP21 (steroid 21-hydroxylase) gene cause congenital adrenal hyperplasia (CAH). These mutations usually result from recombinations between CYP21 and an adjacent pseudogene, CYP21P, including deletions and transfers of deleterious mutations from CYP21P to CYP21 (gene conversions). Additional rare mutations that are not gene conversions account for 5-10% of 21-hydroxylase deficiency alleles. Recently, four novel CYP21 point mutations leading to amino acid changes were identified in a population of 57 Spanish families with CAH. A nonsense mutation, K74X, was also identified. The enzymatic activities of 21-hydroxylase mutants G90V, G178A, G291C, and R354H were examined in transiently transfected CHOP cells using progesterone and 17α-hydroxyprogesterone as substrates. The G90V, G291C, and R354H mutations effectively eliminated 21-hydroxylase activity. However, the G178A mutant retained significant activity when 17α-hydroxyprogesterone was the substrate. These results correlate well with the identification of G90V, G291C, and R354H in patients with severe 'salt-wasting' disease and G178A in a patient with the milder simple virilizing form.
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U2 - 10.1006/bbrc.1999.1271
DO - 10.1006/bbrc.1999.1271
M3 - Article
C2 - 10471376
AN - SCOPUS:0033533579
SN - 0006-291X
VL - 262
SP - 635
EP - 637
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
IS - 3
ER -