Equine Dwarfism

Dwarfism (DWF)

Gene or region: ACAN, B4GALT7

Reference allele: various

Mutant allele: various

Affected Breeds: Many


Research Confidence:                        High confidence, findings reproduced multiple studies


What it does:

What it does: 


Congenital dwarfism is characterized by abnormal growth, leading to either a disproportionate body type or overall smaller body size. Although there are many variants for Dwarfism, there are also emerging "breed-specific" variants. Specifically in the Friesian, the limbs and ribs are mainly affected, leading to a normal sized head, disproportionate back, and abnormally short legs. Research has indicated that it is inherited in an autosomal recessive manner. A recent study also indicated that horses with one variant may be 20% smaller than their ACAN negative relatives.



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