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Huntington’s Disease: Relationship Between Phenotype and Genotype

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Abstract

Huntington’s disease (HD) is an autosomal dominant inherited neurodegenerative disease with the typical manifestations of involuntary movements, psychiatric and behavior disorders, and cognitive impairment. It is caused by the dynamic mutation in CAG triplet repeat number in exon 1 of huntingtin (HTT) gene. The symptoms of HD especially the age at onset are related to the genetic characteristics, both the CAG triplet repeat and the modified factors. Here, we reviewed the recent advancement on the genotype-phenotype relationship of HD, mainly focus on the characteristics of different expanded CAG repeat number, genetic modifiers, and CCG repeat number in the 3′ end of CAG triplet repeat and their effects on the phenotype. We also reviewed the special forms of HD (juvenile HD, atypical onset HD, and homozygous HD) and their phenotype-genotype correlations. The review will aid clinicians to predict the onset age and disease course of HD, give the genetic counseling, and accelerate research into the HD mechanism.

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Acknowledgments

This work was supported by the grant from the National Natural Science Foundation to Zhi-Ying Wu (81125009, Beijing).

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Authors and Affiliations

  1. Department of Neurology and Institute of Neurology, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China

    Yi-Min Sun

  2. Department of Neurology and Research Center of Neurology in Second Affiliated Hospital, and the Collaborative Innovation Center for Brain Science, Zhejiang University School of Medicine, Hangzhou, China

    Yan-Bin Zhang & Zhi-Ying Wu

  3. Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, China

    Yan-Bin Zhang

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  1. Yi-Min Sun
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  2. Yan-Bin Zhang
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  3. Zhi-Ying Wu
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Correspondence to Zhi-Ying Wu.

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Sun, YM., Zhang, YB. & Wu, ZY. Huntington’s Disease: Relationship Between Phenotype and Genotype. Mol Neurobiol 54, 342–348 (2017). https://doi.org/10.1007/s12035-015-9662-8

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