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BclI polymorphism of the glucocorticoid receptor and adrenal crisis in primary adrenal insufficiency.

BclI polymorphism of the glucocorticoid receptor and adrenal crisis in primary adrenal insufficiency.
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Zopf K, Frey K, Kienitz T, Ventz M, Bauer B, Quinkler M,


Zopf K, Frey K, Kienitz T, Ventz M, Bauer B, Quinkler M, (click to view)

Zopf K, Frey K, Kienitz T, Ventz M, Bauer B, Quinkler M,

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Endocrine connections 2017 09 27() pii EC-17-0269
Abstract
CONTEXT
Patients with primary adrenal insufficiency (PAI) or congenital adrenal hyperplasia (CAH) are at high risk of adrenal crisis (AC). Glucocorticoid sensitivity is at least partially genetically determined by polymorphisms of the glucocorticoid receptor (GR).

OBJECTIVES
To determine if number of intercurrent illnesses and AC are associated with the GR gene polymorphism BclI in patients with PAI and CAH.

DESIGN AND PATIENTS
This prospective, longitudinal study over 37.7±10.1 months included 47 PAI and 25 CAH patients. During the study period intercurrent illness episodes and AC were documented.

RESULTS
The study period covered 223 patient years, in which 21 AC occurred (9.4 AC/100 pat years). There were no significant differences between BclI polymorphisms (CC (n=29), CG (n=34), GG (n=9)) regarding BMI, hydrocortisone equivalent daily dose, and blood pressure. We did not find a difference in number of intercurrent illnesses/patient year between BclI polymorphisms (CC (1.5±1.4/pat year), CG (1.2±1.2/pat year), GG (1.6±2.2/pat year)). The occurrence of AC was not significantly different between the homozygous (GG) genotype (32.5 AC/100 pat years), the CC (6.7 AC/100 pat years) and the CG genotype (4.9 AC/100 pat years). Concomitant hypothyroidism was highest in the GG genotype group (5/9), compared to the others (CC (11/29), CG (11/34)).

CONCLUSIONS
Although sample sizes were relatively small and results should be interpreted with caution, this study suggests that the GR gene polymorphism BclI may not be associated with the frequency of intercurrent illnesses and of AC.

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