TY - JOUR
T1 - Body mass index differences in pseudohypoparathyroidism type 1a versus pseudopseudohypoparathyroidism may implicate paternal imprinting of Gαs in the development of human obesity
AU - Long, Dominique N.
AU - McGuire, Sarah
AU - Levine, Michael A.
AU - Weinstein, Lee S.
AU - Germain-Lee, Emily L.
N1 - Funding Information:
This work was supported by U.S. Food and Drug Administration Orphan Products Development Grant R01 FD-R-002658 (to E.L.G.-L.), Thrasher Research Foundation Grant 02818-8 (to E.L.G.-L.), National Institutes of Health Grant T32 DK007751 (to D.N.L.), and National Institutes of Health/National Center for Research Resources Grant M01 RR00052 (to the Johns Hopkins University School of Medicine General Clinical Research Center). L.S.W. is supported by the Intramural Research Program of the National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health.
PY - 2007/3
Y1 - 2007/3
N2 - Context: Obesity is a prominent feature of Albright hereditary osteodystrophy (AHO), a disorder caused by heterozygous GNAS mutations that disrupt the stimulatory G protein α-subunit Gαs. Because Gαs is paternally imprinted in certain hormone target tissues, maternal inheritance of AHO leads to multihormone resistance [pseudohypoparathyroidism type 1a (PHP1a)], whereas paternal inheritance leads to AHO alone [pseudopseudohypoparathyroidism (pseudoPHP)]. Classically, the obesity in AHO is described as occurring similarly in both conditions. Setting: This observational study was conducted at the General Clinical Research Center, Johns Hopkins University School of Medicine; National Institutes of Health. Patients: Fifty-three patients with AHO (40 with PHP1a and 13 with pseudoPHP) and two with progressive osseous heteroplasia were studied. Main Outcome Measures: Main outcome measures were weight and height SD score (SDS), body mass index (BMI) percentiles, and BMI z-scores. Results: Patients with PHP1a had significantly greater mean weight SDS, BMI percentages, and BMI z-scores compared with patients with pseudoPHP. These differences in BMI were secondary to adipose content based on dual energy x-ray absorptiometry analysis. The mean BMI z-score ± SEM for PHP1a was 2.31 ± 0.18 compared with 0.65 ± 0.31 in pseudoPHP (P = 0.000032). Twenty-five of 40 (62.5%) patients with PHP1a had mean BMI z-scores greater than two SDS above the mean, whereas no patients with pseudoPHP had BMI z-scores in this range. Conclusions: Although the AHO phenotype for PHP1a and pseudoPHP has been thought to be similar, we have found that obesity is a more prominent feature in PHP1a than in pseudoPHP and that severe obesity is characteristic of PHP1a specifically. These findings may implicate paternal imprinting of Gαs in the development of human obesity.
AB - Context: Obesity is a prominent feature of Albright hereditary osteodystrophy (AHO), a disorder caused by heterozygous GNAS mutations that disrupt the stimulatory G protein α-subunit Gαs. Because Gαs is paternally imprinted in certain hormone target tissues, maternal inheritance of AHO leads to multihormone resistance [pseudohypoparathyroidism type 1a (PHP1a)], whereas paternal inheritance leads to AHO alone [pseudopseudohypoparathyroidism (pseudoPHP)]. Classically, the obesity in AHO is described as occurring similarly in both conditions. Setting: This observational study was conducted at the General Clinical Research Center, Johns Hopkins University School of Medicine; National Institutes of Health. Patients: Fifty-three patients with AHO (40 with PHP1a and 13 with pseudoPHP) and two with progressive osseous heteroplasia were studied. Main Outcome Measures: Main outcome measures were weight and height SD score (SDS), body mass index (BMI) percentiles, and BMI z-scores. Results: Patients with PHP1a had significantly greater mean weight SDS, BMI percentages, and BMI z-scores compared with patients with pseudoPHP. These differences in BMI were secondary to adipose content based on dual energy x-ray absorptiometry analysis. The mean BMI z-score ± SEM for PHP1a was 2.31 ± 0.18 compared with 0.65 ± 0.31 in pseudoPHP (P = 0.000032). Twenty-five of 40 (62.5%) patients with PHP1a had mean BMI z-scores greater than two SDS above the mean, whereas no patients with pseudoPHP had BMI z-scores in this range. Conclusions: Although the AHO phenotype for PHP1a and pseudoPHP has been thought to be similar, we have found that obesity is a more prominent feature in PHP1a than in pseudoPHP and that severe obesity is characteristic of PHP1a specifically. These findings may implicate paternal imprinting of Gαs in the development of human obesity.
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U2 - 10.1210/jc.2006-1497
DO - 10.1210/jc.2006-1497
M3 - Article
C2 - 17164301
AN - SCOPUS:33947520961
SN - 0021-972X
VL - 92
SP - 1073
EP - 1079
JO - Journal of Clinical Endocrinology and Metabolism
JF - Journal of Clinical Endocrinology and Metabolism
IS - 3
ER -