However, the GCR of DMGDH, CD36 and GJB2, the variants on which were linked to diseases Dimethylglycine dehydrogenase deficiency, Platelet glycoprotein IV deficiency, and Deafness (autosomal recessive 1A), respectively, exhibited substantial variations across ethnic groups. This evidence concerns the gene DMGDH and dimethylglycine dehydrogenase deficiency.