The Genetics Behind Eye Color - rs12913832
Updated: Aug 17
The rs12913832 eye color variant is one of the strongest and most well-studied genetic markers influencing human eye color. Located within the HERC2 gene, this SNP acts as a regulatory switch that controls the activity of the nearby OCA2 gene, which plays a central role in pigmentation [R, R].
How rs12913832 Influences Eye Color
Rather than changing a pigment directly, rs12913832 influences eye color by regulating gene expression [R, R]:
The variant sits in a regulatory region of HERC2
This region controls how strongly OCA2 is expressed in iris cells
OCA2 activity determines how much melanin is produced in the eye
Lower melanin leads to lighter eye colors; higher melanin leads to darker eyes
Why rs12913832 Is Scientifically Important
The rs12913832 eye color variant is widely used in:
Human genetics research
Population genetics and ancestry inference
Forensic DNA phenotyping
Studies of gene regulation and expression
It is often cited as one of the clearest examples of how non-coding DNA can have a powerful biological effect.
Explore Your Trait Genetics
Eye color is one of many visible traits influenced by genetics. Variants like rs12913832 highlight how small regulatory changes can lead to noticeable differences in appearance.
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