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We describe a mild form of disproportionate dwarfism in Labrador Retrievers, which is not associated with any obvious health problems such as secondary arthrosis. We designate this phenotype as skeletal dysplasia 2 (SD2). It is inherited as a monogenic autosomal recessive trait with incomplete penetrance primarily in working lines of the Labrador Retriever breed. Using 23 cases and 37 controls we mapped the causative mutation by genome-wide association and homozygosity mapping to a 4.44 Mb interval on chromosome 12. We re-sequenced the genome of one affected dog at 30x coverage and detected 92 non-synonymous variants in the critical interval. Only two of these variants, located in the lymphotoxin A ( LTA ) and collagen alpha-2(XI) chain gene ( COL11A2 ), respectively, were perfectly associated with the trait. Previously described  COL11A2  variants in humans or mice lead to skeletal dysplasias and/or deafness. The dog variant associated with disproportionate dwarfism,  COL11A2:c.143G>C  or p.R48P, probably has only a minor effect on collagen XI function, which might explain the comparatively mild phenotype seen in our study. The identification of this candidate causative mutation thus widens the known phenotypic spectrum of  COL11A2  mutations. We speculate that non-pathogenic  COL11A2  variants might even contribute to the heritable variation in height.

A COL11A2 Mutation in Labrador Retrievers with Mild Disproportionate Dwarfism