Document Detail


A genetic defect resulting in mild low-renin hypertension.
MedLine Citation:
PMID:  9707624     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Severe low-renin hypertension has few known causes. Apparent mineralocorticoid excess (AME) is a genetic disorder that results in severe juvenile low-renin hypertension, hyporeninemia, hypoaldosteronemia, hypokalemic alkalosis, low birth weight, failure to thrive, poor growth, and in many cases nephrocalcinosis. In 1995, it was shown that mutations in the gene (HSD11B2) encoding the 11beta-hydroxysteroid dehydrogenase type 2 enzyme (11beta-HSD2) cause AME. Typical patients with AME have defective 11beta-HSD2 activity, as evidenced by an abnormal ratio of cortisol to cortisone metabolites and by an exceedingly diminished ability to convert [11-3H]cortisol to cortisone. Recently, we have studied an unusual patient with mild low-renin hypertension and a homozygous mutation in the HSD11B2 gene. The patient came from an inbred Mennonite family, and though the mutation identified her as a patient with AME, she did not demonstrate the typical features of AME. Biochemical analysis in this patient revealed a moderately elevated cortisol to cortisone metabolite ratio. The conversion of cortisol to cortisone was 58% compared with 0-6% in typical patients with AME whereas the normal conversion is 90-95%. Molecular analysis of the HSD11B2 gene of this patient showed a homozygous C-->T transition in the second nucleotide of codon 227, resulting in a substitution of proline with leucine (P227L). The parents and sibs were heterozygous for this mutation. In vitro expression studies showed an increase in the Km (300 nM) over normal (54 nM). Because approximately 40% of patients with essential hypertension demonstrate low renin, we suggest that such patients should undergo genetic analysis of the HSD11B2 gene.
Authors:
R C Wilson; S Dave-Sharma; J Q Wei; V R Obeyesekere; K Li; P Ferrari; Z S Krozowski; C H Shackleton; L Bradlow; T Wiens; M I New
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Publication Detail:
Type:  Case Reports; Journal Article; Research Support, U.S. Gov't, P.H.S.; Review    
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  95     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  1998 Aug 
Date Detail:
Created Date:  1998-09-17     Completed Date:  1998-09-17     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  10200-5     Citation Subset:  IM    
Affiliation:
Pediatric Endocrinology, The New York Hospital-Cornell Medical Center, 525 East 68th Street, New York, NY 10021, USA.
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MeSH Terms
Descriptor/Qualifier:
11-beta-Hydroxysteroid Dehydrogenases
Adolescent
Base Sequence
Child
Child, Preschool
Consanguinity
Cortisone / metabolism
DNA Mutational Analysis
DNA Primers / genetics
Female
Homozygote
Humans
Hydrocortisone / metabolism
Hydroxysteroid Dehydrogenases / genetics
Hypertension / etiology,  genetics*,  metabolism*
Infant
Male
Metabolism, Inborn Errors / complications,  genetics*,  metabolism*
Mineralocorticoids / metabolism*
Pedigree
Point Mutation
Renin / deficiency*
Grant Support
ID/Acronym/Agency:
HD00072/HD/NICHD NIH HHS; RR 06020/RR/NCRR NIH HHS
Chemical
Reg. No./Substance:
0/DNA Primers; 0/Mineralocorticoids; 50-23-7/Hydrocortisone; 53-06-5/Cortisone; EC 1.1.-/Hydroxysteroid Dehydrogenases; EC 1.1.1.146/11-beta-Hydroxysteroid Dehydrogenases; EC 3.4.23.15/Renin
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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