Application of Gene Detection in Rare Diseases
Clinical and gene methylation analysis of type 1b pseudohypoparathyroidism
Ma Yujin, Liu Peng, Yuan Yuan, Lu Haibo, Zhang Wenbo, Fu Liujun, Li Liping, Liu Jie, Zhang Yingyu, Peng Huifang, Jiang Hongwei
Published 2019-12-25
Cite as Chin J Endocrinol Metab, 2019,35(12): 1001-1005. DOI: 10.3760/cma.j.issn.1000-6699.2019.12.002
Abstract
ObjectiveThis study was carried out to analyze the clinical characteristics of pseudohypopara-thyroidism(PHP) type 1b, and to improve the understanding and diagnosis of the disease.
MethodsFive patients with molecular diagnosis of pseudohypoparathyroidism type 1b in our hospital during 2018 were enrolled, their clinical data, biochemical indicators, imaging, and gene detection results were analyzed.
ResultsThere were 4 females and 1 male, with low calcium, high phosphorus and high PTH serum concentrations. The onset age span was large and the onset symptoms were different. Family history may not be obvious. There was abnormal methylation of GNAS gene or deletion of exon STX16 in methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA) detection while gene sequencing result was negative.
ConclusionMS-MLPA detection was still needed in patients with suspected PHP but negative gene sequencing result. Different methylation abnormalities and copy number variations might be correlated with the onset symptoms and familial of type 1b PHP.
Key words:
Pseudohypoparathyroidism, type 1b; GNAS; Methylation
Contributor Information
Ma Yujin
Luoyang City Clinical Research for Endocrinology and Metabolism, Department of Endocrinology and Metabolism, the First Affiliated Hospital of Henan University of Science and Technology, Luoyang 471003, China
Liu Peng
Yuan Yuan
Lu Haibo
Zhang Wenbo
Fu Liujun
Li Liping
Liu Jie
Zhang Yingyu
Peng Huifang
Jiang Hongwei