In other species: domestic cat , cattle , chicken , dog , turkey , domestic guinea pig , goat , guanaco , Arabian camel , Western roe deer , horse , springbok , rock pigeon , sheep

Possibly relevant human trait(s) and/or gene(s) (MIM number): 174500

Mendelian trait/disorder: no

Considered a defect: yes

Key variant known: no

Cross-species summary: Often called preaxial polydactyly (PPD)

Inheritance: Gorbach et al. (2010) provided convincing data that this disorder is inherited but could find no evidence of a single gene of large effect. A whole-genome scan with a SNP chip identified a 25 Mb region on chromosome SSC5 that appears to play some role in the development of this disorder.