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Assessment of Molecular Subtypes in Thyrotoxic Periodic Paralysis and Graves Disease Among Chinese Han Adults: A Population-Based Genome-Wide Association Study.


ABSTRACT:

Importance

Thyrotoxic periodic paralysis (TPP) is a potentially lethal complication of hyperthyroidism. However, only 1 specific susceptibility locus for TPP has been identified. Additional genetic determinants should be detected so that a prediction model can be constructed.

Objective

To investigate the genetic architecture of TPP and distinguish TPP from Graves disease cohorts.

Design, setting, and participants

This population-based case-control study used a 2-stage genome-wide association study to investigate the risk loci of TPP and weighted genetic risk score to construct a TPP prediction model with data from a Chinese Han population recruited in hospitals in China from March 2003 to December 2015. The analysis was conducted from November 2014 to August 2016.

Main outcomes and measures

Loci specifically associated with TPP risk and those shared with Graves disease and prediction model of joint effects of TPP-specific loci.

Results

A total of 537 patients with TPP (mean [SD] age, 35 [11] years; 458 male) 1519 patients with Graves disease and no history of TPP (mean [SD] age, 38 [13] years; 366 male), and 3249 healthy participants (mean [SD] age, 46 [10] years; 1648 male) were recruited from the Han population by hospitals throughout China. Two new TPP-specific susceptibility loci were identified: DCHS2 on 4q31.3 (rs1352714: odds ratio [OR], 1.58; 95% CI, 1.35-1.85; P = 1.24 × 10-8) and C11orf67 on 11q14.1 (rs2186564: OR, 1.50; 95% CI, 1.29-1.74; P = 2.80 × 10-7). One previously reported specific locus was confirmed on 17q24.3 near KCNJ2 (rs312729: OR, 2.08; 95% CI, 1.83-2.38; P = 8.02 × 10-29). Meanwhile, 2 risk loci (MHC and Xq21.1) were shared by Graves disease and TPP. After 2 years of treatment, the ratio of persistent thyrotropin receptor antibody positivity was higher in patients with TPP than in patients with Graves disease and no history of TPP (OR, 3.82; 95% CI, 2.04-7.16; P = 7.05 × 10-6). The prediction model using a weighted genetic risk score and 11 candidate TPP-specific single-nucleotide polymorphisms had an area under the curve of 0.80.

Conclusions and relevance

These findings provide evidence that TPP is a novel molecular subtype of Graves disease. The newly identified loci, along with other previously reported loci, demonstrate the growing complexity of the heritable contribution to TPP pathogenesis. A complete genetic architecture will be helpful to understand the pathophysiology of TPP, and a useful prediction model could prevent the onset of TPP.

SUBMITTER: Zhao SX 

PROVIDER: S-EPMC6503496 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Publications

Assessment of Molecular Subtypes in Thyrotoxic Periodic Paralysis and Graves Disease Among Chinese Han Adults: A Population-Based Genome-Wide Association Study.

Zhao Shuang-Xia SX   Liu Wei W   Liang Jun J   Gao Guan-Qi GQ   Zhang Xiao-Mei XM   Yao Yu Y   Wang Hai-Ning HN   Yuan Fei-Fei FF   Xue Li-Qiong LQ   Ma Yu-Ru YR   Zhang Le-Le LL   Ye Xiao-Ping XP   Zhang Qian-Yue QY   Sun Feng F   Zhang Rui-Jia RJ   Yang Shao-Ying SY   Zhan Ming M   Du Wen-Hua WH   Liu Bing-Li BL   Chen Xia X   Song Zhi-Yi ZY   Li Xue-Song XS   Li Ping P   Ru Ying Y   Zuo Chun-Lin CL   Li Sheng-Xian SX   Han Bing B   Zhu Hui H   Qiao Jie J   Xuan Miao M   Su Bin B   Sun Fei F   Ma Jun-Hua JH   Chen Jia-Lun JL   Tian Hao-Ming HM   Chen Sai-Juan SJ   Song Huai-Dong HD  

JAMA network open 20190503 5


<h4>Importance</h4>Thyrotoxic periodic paralysis (TPP) is a potentially lethal complication of hyperthyroidism. However, only 1 specific susceptibility locus for TPP has been identified. Additional genetic determinants should be detected so that a prediction model can be constructed.<h4>Objective</h4>To investigate the genetic architecture of TPP and distinguish TPP from Graves disease cohorts.<h4>Design, setting, and participants</h4>This population-based case-control study used a 2-stage genom  ...[more]

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