Absence of D147E mutation of CYP11B2 gene in hypertensive patients with increased corticosterone and aldosterone production.
OBJECTIVE
11beta-Hydroxylase and aldosterone synthase are two highly homologous genes involved in different forms of human hypertension and in different animal models of hypertension. It has been shown that the conservative substitution D147E in the human CYP11B2 gene results in an increased production of corticosterone and aldosterone in vitro. A gene conversion between the CYP11B1 and CYP11B2 genes could be responsible for such a substitution.


METHODS
In this study we investigated the presence of the mutation D147E of CYP11B2 in a group of 128 patients with primary aldosteronism, 68 patients with essential hypertension and increased corticosterone production and in 48 normal volunteers.


CONCLUSIONS
We did not identify any patient carrying this mutation, indicating that if it exists it is very rare and so has no relevance in determining the increased steroid excretion seen in some subtypes of human hypertension.
Department of Medicine and Experimental Oncology, Hypertension Unit, University of Torino, Italy. mulatero@tin.it
P
P
Mulatero
N
N
Glorioso
F
F
Fallo
A
A
Soro
S
S
Morra di Cella
R
R
Carra
F
F
Filigheddu
F
F
Veglio
D000368:Aged; D000450:Aldosterone / Q000096:biosynthesis* / Q000097:blood; D003345:Corticosterone / Q000096:biosynthesis* / Q000097:blood; D019405:Cytochrome P-450 CYP11B2 / Q000235:genetics*; D005091:Exons / Q000235:genetics; D005260:Female; D005838:Genotype; D006801:Humans; D006973:Hypertension / Q000097:blood* / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D012083:Renin / Q000097:blood; D020133:Reverse Transcriptase Polymerase Chain Reaction
D000450:Aldosterone; D019405:Cytochrome P-450 CYP11B2; D012083:Renin; D003345:Corticosterone