PLA2G6 mutations in PARK14-linked young-onset parkinsonism and sporadic Parkinson's disease

Authors

  • Chin-Song Lu,

    1. Division of Movement Disorders, Department of Neurology, Chang Gung Memorial Hospital at Linkou Medical Center and Chang Gung University, Taoyuan, Taiwan
    2. Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou Medical Center, Taoyuan, Taiwan
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  • Szu-Chia Lai,

    1. Division of Movement Disorders, Department of Neurology, Chang Gung Memorial Hospital at Linkou Medical Center and Chang Gung University, Taoyuan, Taiwan
    2. Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou Medical Center, Taoyuan, Taiwan
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  • Ruey-Meei Wu,

    1. Department of Neurology, National Taiwan University Hospital, Taipei, Taiwan
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  • Yi-Hsin Weng,

    1. Division of Movement Disorders, Department of Neurology, Chang Gung Memorial Hospital at Linkou Medical Center and Chang Gung University, Taoyuan, Taiwan
    2. Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou Medical Center, Taoyuan, Taiwan
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  • Chia-Ling Huang,

    1. Department of Neurology, Saint Paul's Hospital, Taoyuan, Taiwan
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  • Rou-Shayn Chen,

    1. Division of Movement Disorders, Department of Neurology, Chang Gung Memorial Hospital at Linkou Medical Center and Chang Gung University, Taoyuan, Taiwan
    2. Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou Medical Center, Taoyuan, Taiwan
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  • Hsiu-Chen Chang,

    1. Division of Movement Disorders, Department of Neurology, Chang Gung Memorial Hospital at Linkou Medical Center and Chang Gung University, Taoyuan, Taiwan
    2. Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou Medical Center, Taoyuan, Taiwan
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  • Yah-Huei Wu-Chou,

    Corresponding author
    1. Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou Medical Center, Taoyuan, Taiwan
    2. Human Molecular Genetics Laboratory, Chang Gung Memorial Hospital at Linkou Medical Center, and Chang Gung University, Taoyuan, Taiwan
    • Human Molecular Genetics Laboratory, Chang Gung Memorial Hospital at Linkou Medical Center and Chang Gung University, Taoyuan, Taiwan.
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  • Tu-Hsueh Yeh

    Corresponding author
    1. Division of Movement Disorders, Department of Neurology, Chang Gung Memorial Hospital at Linkou Medical Center and Chang Gung University, Taoyuan, Taiwan
    2. Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou Medical Center, Taoyuan, Taiwan
    • Department of Neurology, Chang Gung Memorial Hospital 199, Tung-Hwa North Road, Taipei 10591 Taiwan.
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  • How to Cite this Article: Lu C-S, Lai S-C, Wu R-M, Weng Y-H, Huang C-L, Chen R-S, Chang H-C, Wu-Chou Y-H, Yeh T-H. 2012. PLA2G6 mutations in PARK14-linked young-onset parkinsonism and sporadic Parkinson's disease. Am J Med Genet Part B 159B:183–191.

Abstract

Mutations of PLA2G6 gene have been lately proposed to be the causative gene for PARK14 in patients with autosomal recessive young-onset parkinsonism (YOPD). The role of PLA2G6 mutations as a risk factor for Parkinson's disease is not clear. To study the PLA2G6 mutations in PARK14-linked patients and its association with the onset of sporadic Parkinson's disease (sPD), sequencing and gene dosage analyses were carried out in 25 patients (onset age ≦30 years) then the identified variants were assessed in 956 sporadic PD (sPD) patients and 802 age-matched healthy controls. Four genetic variants were identified; one patient had homozygous c.991G > T (p.Asp331Tyr) mutation, two had compound heterozygous c.991G > T/c.1077G > A (p.Met358IlefsX) mutation, one had single c.1976A > G (p.Asn659Ser) mutation, and one patient had an exon 1 hetero-deletion. The c.1077G > A mutation resulted in a 4-bp deletion in leukocyte mRNA by activating a cryptic splice site in exon 7. Only p.Asp331Tyr was identified in four sPD patients and four controls. The onset age for PLA2G6 mutation carriers was younger than that for sPD (29.86 ± 8.59 vs. 56.84 ± 11.33 years, P= 0.0002). The analysis of previously reported PARK14 patients revealed that those who carried a truncated mutation tended to have a complicated phenotype and atrophies of cortex and cerebellum. In conclusion, PLA2G6 mutation was the second common genetic cause after PRKN mutation in our YOPD patients and might be a risk factor for early-onset PD in Han Chinese. Additionally, mutation data should be interpreted carefully because even a synonymous mutation could cause abnormal mRNA splicing. © 2011 Wiley Periodicals, Inc.

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