TDP1 and cerebellar ataxia: Comparison of the TDP1 exon sequences in HAP1 cells with the human reference genome revealed a unique SNV of TDP1 c.400G > A (TDP1 p.Ala134Thr; Supplementary Figure S1A) reported to be associated with spinocerebellar ataxia, autosomal recessive, with axonal neuropathy 1 (SCAN1; RCV000282718.5 on ClinVar).