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Journal of Clinical Endocrinology & Metabolism, Vol 77, 687-691, Copyright © 1993 by Endocrine Society
ARTICLES |
H Nikkila, GM Tannin, MI New, NF Taylor, G Kalaitzoglou, C Monder and PC White
Division of Pediatric Endocrinology, Cornell University Medical College, New York, New York 10021.
The syndrome of apparent mineralocorticoid excess (AME) is a form of low renin hypertension that is thought to be caused by congenital deficiency of 11 beta-hydroxysteroid dehydrogenase (11HSD) activity. This enzyme converts cortisol to cortisone and apparently prevents cortisol from acting as a ligand for the mineralocorticoid (type I) receptor. It also catalyzes the reverse oxoreductase (cortisone to cortisol) reaction. Four patients with AME and the parents of the first patient described (now decreased) were analyzed for mutations in the cloned HSD11 gene encoding an 11HSD enzyme. A patient with suspected cortisone reductase deficiency was also studied. No gross deletions or rearrangements in the HSD11 gene were apparent on hybridizations of blots of genomic DNA. Direct sequencing of polymerase chain reaction- amplified fragments corresponding to the coding sequences, intronexon junctions, and proximal untranslated regions of this gene revealed no mutations. AME may involve mutations in a gene for another enzyme with 11HSD activity or perhaps another cortisol-metabolizing enzyme.
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