Rs28935199

Colorblindness is typically caused by rearrangements in the region of the X chromosome harboring the green and red opsin genes. In a small number of cases, SNPs in opsin genes can also lead to colorblindness.

rs28935199 is an example of such a SNP. One Japanese male homozygous for the [[rs28935199] (A) allele, which causes a change from an arginine to a glutamine in the green opsin protein at position 330, has been observed to be colorblind..