Genetic defects in DNA repair are increasingly recognized as being able to cause degenerative ataxia syndromes. It remains a mystery, however, why disruption of a process fundamental to proliferating cells can be selectively toxic to postmitotic neurons. Recent studies now reveal that an ataxia gene, tyrosyl phosphodiesterase 1 (TDP1), repairs single-stranded DNA breaks in nondividing cells. Here we review the implications of this and other findings for a growing list of hereditary ataxias.
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