Abstract
TMEM151A, located at 11q13.2 and encoding transmembrane protein 151A, was recently reported as causative for autosomal dominant paroxysmal kinesigenic dyskinesia (PKD). Here, through comprehensive analysis of sporadic and familial cases, we expand the clinical and mutation spectrum of PKD. In doing so, we clarify the clinical and genetic features of Chinese PKD patients harboring TMEM151A variants and further explore the relationship between TMEM151A mutations and PKD. Whole exome sequencing was performed on 26 sporadic PKD patients and nine familial PKD pedigrees without PRRT2 variants. Quantitative real-time PCR was used to assess the gene expression of frameshift mutant TMEM151A in a PKD patient. TMEM151A variants reported to date were reviewed. Four TMEM151A variants were detected in four unrelated families with 12 individuals, including a frameshift mutation [c.606_607insA (p.Val203fs)], two missense mutations [c.166G > A (p.Gly56Arg) and c.791T > C (p.Val264Ala)], and a non-pathogenic variant [c.994G > A (p.Gly332Arg)]. The monoallelic frameshift mutation [c.606_607insA (p.Val203fs)] may cause TMEM151A mRNA decay, suggesting a potential pathogenic mechanism of haploinsufficiency. Patients with TMEM151A variants had short-duration attacks and presented with dystonia. Our study provides a detailed clinical description of PKD patients with TMEM151A mutations and reports a new disease-causing mutation, expanding the known phenotypes caused by TMEM151A mutations and providing further detail about the pathoetiology of PKD.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We would like to acknowledge all of the patients and their families for their participation in our study.
Funding
This study was funded by the National Natural Science Foundation of China (NO.81801295 and 81501248), the Wisdom Accumulation and Talent Cultivation Project of the Third xiangya hospital of Central South University (YX202205), the Science and Technology Innovation Program of Hunan Province (2021RC3031), the Natural Foundation of **njiang Uygur Autonomous Region (No.2018D01C225), the Scientific Research Program of Hunan Provincial Health Commission (20220503347), and the Open Research Program of Key Laboratory of Regenerative Biology of Chinese Academy of Sciences (KLRB202010).
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QXZ, CYM, and DL contributed to conception and design of the study. QX Z and HL H wrote the first draft of the manuscript. HL H revised the manuscript, while QX Z and FH assisted in the preparation of the figures. FH carried out the experimental design and data analysis later. QXZ, CYM collected the clinical data. XYL, BX and GLL supervised the study. FH wrote and revised the final version of the paper. HLH, ZS and DL revised the manuscript and gave final approval of the version to be published. All authors contributed to revising the manuscript and read through and approved the submitted version.
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Huang, H.l., Zhang, Q.x., Huang, F. et al. TMEM151A variants associated with paroxysmal kinesigenic dyskinesia. Hum. Genet. 142, 1017–1028 (2023). https://doi.org/10.1007/s00439-023-02535-3
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DOI: https://doi.org/10.1007/s00439-023-02535-3