An ALS case with 38 (G4C2)-repeats in the C9orf72 gene shows TDP-43 and sparse dipeptide repeat protein pathology
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The (G4C2)-hexanucleotide repeat expansion in chromosome 9 open reading frame 72 (C9orf72) is the most common mutation linked to amyotrophic lateral sclerosis (ALS), as it accounts for 51.6% of the familial ALS cases and 9.6% of the sporadic ALS cases [1, 2]. This repeat expansion also underlies approximately 25% of the familial frontotemporal lobar degeneration (FTLD) cases [12]. The pathogenic (G4C2)-repeat length is estimated to range from hundreds to thousands of repeat units, whereas neurologically healthy controls usually show a repeat length of only 2–30 (G4C2)-repeats [3]. However, the threshold for the repeat length to drive or aggravate ALS pathology is still under debate. Some ALS or FTLD cases show an intermediate (G4C2)-repeat length of 30–90 (G4C2)-repeats in peripheral blood DNA [4, 5, 7, 11], while, in contrast, some 30–70 repeat carriers did not develop symptomatic disease [6, 8]. Several cases with this so-called intermediate repeat length in peripheral blood DNA...
Keywords
Amyotrophic lateral sclerosis C9orf72 repeat expansion Dipeptide repeat proteins Transactive response DNA-binding protein 43 kDaNotes
Acknowledgements
LD is funded by a PhD Fellowship of the Research Foundation–Flanders (FWO-Vlaanderen) (1165119N). EVS is funded by an SB PhD Fellowship of FWO-Vlaanderen (1S46219N). PVD holds a senior clinical investigatorship of FWO-Vlaanderen and is supported by the ALS Liga Belgium and the KU Leuven ALS funds ‘Een hart voor ALS’ and ‘Laeversfonds voor ALS onderzoek’. PVD and DRT received C1-internal funds from KU Leuven (C14-17–107). DRT and RV received funding from FWO-Odysseus Grant no. G0F8516N and Vlaamse Impulsfinanciering voor Netwerken voor Dementie Onderzoek (VIND, IWT 135043). We thank Bruno Van Keirsbilck, Alicja Ronisz, Simona Ospitalieri, Petra Weckx and Marta Koper for technical support.
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References
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