#tyrp1

[amber-tortoiseshell]

Do humans have the same gene mutation that causes brown/chocolate/liver/etc in so many animals? is that what makes hair brown with black colored hair being default? if not, how would it effect someone do you think?

General human hair color is too polygenic for statements like that, however yes, there are several identified TYRP1 mutations in humans: most cause type III oculocutaneous albinism, but melanesian blond is also here.

1, 2

[genegeter]

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[worldtreats]

Inhabitants of Solomon Islands in the Pacific have darkest skin among people living outside the African continent. At the same time, ratio of natural blondes among these people is also much more than any other non-European populations, and scientists have discovered that the reason for this is a single gene... It was found that mutation in single gene tyrosinase-related protein 1 (TYRP1), localized in chromosome 9, explains the variation of hair color in the people on Solomon Islands. This gene encodes the enzyme, responsible for formation of human skin and hair pigmentation....

http://www.youthgoogly.com/blonde-hair-in-black-population-polynesian-is-due-to-genetic-mutation-study/857

http://www.youthgoogly.com/blonde-hair-in-black-population-polynesian-is-due-to-genetic-mutation-study/857

[worldtreats]

...In fact, the blonde Melanesians have blonde that is unique solely to them. According to the study in which scientists compared 43 blonde hair islanders to 42 dark hair islanders, blonde Melanesians have a variant of a native gene called TYRP1 that plays an important role in the melanin biosynthetic pathway. This variant is completely separate from what causes blonde hair in Europeans, and doesn’t even exist in the European genetic set.... 

http://blackgirllonghair.com/2012/05/black-people-with-naturally-blonde-hair/