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Journal Article
Research Support, Non-U.S. Gov't
Adrenocorticotropin receptor gene mutations in familial glucocorticoid deficiency: relationships with clinical features in four families.
Journal of Clinical Endocrinology and Metabolism 1995 January
Familial glucocorticoid deficiency is an autosomal recessive syndrome of adrenal unresponsiveness to ACTH characterized by glucocorticoid deficiency, high plasma ACTH levels, and a normal renin-aldosterone axis. Defects of the ACTH receptor have been suggested as a possible cause, and we have previously reported a number of novel mutations of the ACTH receptor gene in some, but not all, cases, suggesting that familial glucocorticoid deficiency may have a heterogeneous molecular etiology. Here we report the clinical features and ACTH receptor gene analysis in four patients from different families. We found that two patients were compound heterozygotes for the S74I and R128C mutations (patient A) and I44M and L192fs frame shift mutations (patient B). The other two patients (C and D) were of different ethnic ancestry, but were both homozygous for a R146H mutation. Segregation studies within families revealed heterozygosity in the parents and several other family members. Human CRH tests in the parents of patients A and B showed normal cortisol and ACTH responses in the S74I, R128C, and I44M heterozygotes and exaggerated cortisol and ACTH responses in the L192fs heterozygote, suggesting that the physiological ACTH increment induced in this test did not reveal evidence of subclinical ACTH resistance, and that this test may not be of value in ascertaining heterozygosity.
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