ATXN3 and Spinocerebellar ataxia type 3: To simplify the identification of informative markers for linked haplotype analysis in prospective couples who wish to undergo PGT-M for SCA3/MJD, we have also developed a novel single-tube hexadecaplex PCR assay for the simultaneous genotyping of 16 highly polymorphic microsatellite markers flanking the ATXN3 CAG repeat.