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Skeletal Dysplasia 2 (Mild Disproportionate Dwarfism) Overview

Skeletal Dysplasia 2 (Mild Disproportionate Dwarfism)
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Category: Musculoskeletal - Associated with muscles, bones and associated structures

Gene: Collagen alpha-2(XI) chain gene (COL11A2) on chromosome 12

Variant Detected: Base Substitution c.143G>C p.Arg48Pro

Severity: Moderate. This disease can cause significant signs of discomfort and/or dysfunction in affected animals. It may involve relatively high treatment/management costs, and can sometimes reduce life expectancy.

Mode of Inheritance: Autosomal Recessive with Incomplete Penetrance

Test Overview: Skeletal Dysplasia 2 is a form a dwarfism an inherited Musculoskeletal disease affecting Labrador Retrievers. Affected dogs develop a mild form of “disproportionate dwarfism” consisting of short legs with normal body length and width. The leg bones are shorter, thicker, and slightly curved and the front legs are frequently more affected than rear legs. Joints and eyes are not typically affected with this disease. The height of affected dogs is variable, making diagnosis based on physical characteristics alone challenging in some individuals. Mildly affected dogs from bloodlines known to produce large dogs may still fall within their breed standard for height. The causal variant shows Incomplete Penetrance meaning that not all dogs inheriting two copies (one from each parent) will display obvious physical characteristics of dwarfism.

Research Citation(s): Frischknecht et al. A COL11A2 Mutation in Labrador Retrievers with Mild Disproportionate Dwarfism. (2013) PLoS one 8(3)e60149.

Associated Breed(s): Labrador Retriever,  Golden Retriever,  Australian Cobberdog,  Australian Labradoodle ,  Labradoodle ,  Mixed Breed,  Labradoodle Retrodoodle ,