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A common flanking variant is associated with enhanced meiotic stability of the FGF14 -SCA27B locus

David Pellerin et al. bioRxiv. .

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  • A common flanking variant is associated with enhanced stability of the FGF14-SCA27B repeat locus.
    Pellerin D, Del Gobbo GF, Couse M, Dolzhenko E, Nageshwaran SK, Cheung WA, Xu IRL, Dicaire MJ, Spurdens G, Matos-Rodrigues G, Stevanovski I, Scriba CK, Rebelo A, Roth V, Wandzel M, Bonnet C, Ashton C, Agarwal A, Peter C, Hasson D, Tsankova NM, Dewar K, Lamont PJ, Laing NG, Renaud M, Houlden H, Synofzik M, Usdin K, Nussenzweig A, Napierala M, Chen Z, Jiang H, Deveson IW, Ravenscroft G, Akbarian S, Eberle MA, Boycott KM, Pastinen T; All of Us Research Program Long Read Working Group; Brais B, Zuchner S, Danzi MC. Pellerin D, et al. Nat Genet. 2024 Jul;56(7):1366-1370. doi: 10.1038/s41588-024-01808-5. Epub 2024 Jun 27. Nat Genet. 2024. PMID: 38937606 Free PMC article.

Abstract

The factors driving initiation of pathological expansion of tandem repeats remain largely unknown. Here, we assessed the FGF14 -SCA27B (GAA)•(TTC) repeat locus in 2,530 individuals by long-read and Sanger sequencing and identified a 5'-flanking 17-bp deletion-insertion in 70.34% of alleles (3,463/4,923). This common sequence variation was present nearly exclusively on alleles with fewer than 30 GAA-pure repeats and was associated with enhanced meiotic stability of the repeat locus.

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