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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/214830
Genome-wide meta-analysis of short-tandem repeats for Parkinson's disease risk using genotype imputation
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Idiopathic Parkinson's disease is determined by a combination of genetic and environmental factors. Recently, the first genome-wide association study on short-tandem repeats in Parkinson's disease reported on eight suggestive short-tandem repeat-based risk loci (alpha = 5.3 x 10-6), of which four were novel, i.e. they had not been implicated in Parkinson's disease risk by genome-wide association analyses of single-nucleotide polymorphisms before. Here, we tested these eight candidate short-tandem repeats in a large, independent Parkinson's disease case-control dataset (n = 4757). Furthermore, we combined the results from both studies by meta-analysis resulting in the largest Parkinson's disease genome-wide association study of short-tandem repeats to date (n = 43 844). Lastly, we investigated whether leading short-tandem repeat risk variants exert functional effects on gene expression regulation based on methylation quantitative trait locus data in human 'post-mortem' brain (n = 142). None of the eight previously reported short-tandem repeats were significantly associated with Parkinson's disease in our independent dataset after multiple testing correction (alpha = 6.25 x 10-3). However, we observed modest support for short-tandem repeats near CCAR2 and NCOR1 in the updated meta-analyses of all available data. While the genome-wide meta-analysis did not reveal additional study-wide significant (alpha = 6.3 x 10-7) short-tandem repeat signals, we identified seven novel suggestive Parkinson's disease short-tandem repeat risk loci (alpha = 5.3 x 10-6). Of these, especially a short-tandem repeat near MEIOSIN showed consistent evidence for association across datasets. CCAR2, NCOR1 and one novel suggestive locus identified here (LINC01012) emerged from colocalization analyses showing evidence for a shared causal short-tandem repeat variant affecting both Parkinson's disease risk and cis DNA methylation in brain. Larger studies, ideally using short-tandem repeats called from whole-sequencing data, are needed to more fully investigate their role in Parkinson's disease. Ohlei et al.'s updated genome-wide association study on short-tandem repeats (STRs) in 43 844 Parkinson's disease cases and controls supported two (CCAR2 and NCOR1) of eight previously reported risk STRs. Seven novel suggestive risk loci were identified, including a STR near MEIOSIN. Several STRs may act via DNA methylation changes. Graphical Abstract
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OHLEI, Olena, et al. Genome-wide meta-analysis of short-tandem repeats for Parkinson's disease risk using genotype imputation. Brain Communications. 2024. Vol. 6, num. 3. ISSN 2632-1297. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/214830