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Certain ethnicities have higher incidences of different forms. For example, the most common type, called oculocutaneous albinism type 2 OCA2 , is especially frequent among people of black African descent.

It is an autosomal recessive disorder characterized by a congenital reduction or absence of melanin pigment in the skin, hair, and eyes.

The estimated frequency of OCA2 among African-Americans is 1 in 10,, which contrasts with a frequency of 1 in 36, in white Americans. People with this IB variant of the disorder commonly have white hair and skin at birth, but rapidly develop normal skin pigmentation in infancy.

Ocular albinism affects not only eye pigmentation but visual acuity, as well. In addition, two forms of albinism, with approximately 1 in most prevalent among people of Puerto Rican origin, are associated with mortality beyond melanoma-related deaths.

The connection between albinism and deafness is well known, though poorly understood. In his treatise On the Origin of Species , Charles Darwin observed that "cats which are entirely white and have blue eyes are generally deaf".

Similar patterns of albinism and deafness have been found in other mammals, including dogs and rodents. However, a lack of melanin per se does not appear to be directly responsible for deafness associated with hypopigmentation, as most individuals lacking the enzymes required to synthesize melanin have normal auditory function.

In Parkinson's disease, a disorder that affects neuromotor functioning, there is decreased neuromelanin in the substantia nigra and locus coeruleus as consequence of specific dropping out of dopaminergic and noradrenergic pigmented neurons.

This results in diminished dopamine and norepinephrine synthesis. While no correlation between race and the level of neuromelanin in the substantia nigra has been reported, the significantly lower incidence of Parkinson's in blacks than in whites has "prompt[ed] some to suggest that cutaneous melanin might somehow serve to protect the neuromelanin in substantia nigra from external toxins.

In addition to melanin deficiency, the molecular weight of the melanin polymer may be decreased by various factors such as oxidative stress, exposure to light, perturbation in its association with melanosomal matrix proteins , changes in pH , or in local concentrations of metal ions.

A decreased molecular weight or a decrease in the degree of polymerization of ocular melanin has been proposed to turn the normally anti-oxidant polymer into a pro-oxidant.

In its pro-oxidant state, melanin has been suggested to be involved in the causation and progression of macular degeneration and melanoma.

Higher eumelanin levels also can be a disadvantage, however, beyond a higher disposition toward vitamin D deficiency.

Dark skin is a complicating factor in the laser removal of port-wine stains. Effective in treating white skin, in general, lasers are less successful in removing port-wine stains in people of Asian or African descent.

Higher concentrations of melanin in darker-skinned individuals simply diffuse and absorb the laser radiation, inhibiting light absorption by the targeted tissue.

In similar manner, melanin can complicate laser treatment of other dermatological conditions in people with darker skin.

Freckles and moles are formed where there is a localized concentration of melanin in the skin. They are highly associated with pale skin.

Nicotine has an affinity for melanin-containing tissues because of its precursor function in melanin synthesis or its irreversible binding of melanin.

This has been suggested to underlie the increased nicotine dependence and lower smoking cessation rates in darker pigmented individuals.

Melanocytes insert granules of melanin into specialized cellular vesicles called melanosomes. These are then transferred into the keratinocyte cells of the human epidermis.

The melanosomes in each recipient cell accumulate atop the cell nucleus , where they protect the nuclear DNA from mutations caused by the ionizing radiation of the sun's ultraviolet rays.

In general, people whose ancestors lived for long periods in the regions of the globe near the equator have larger quantities of eumelanin in their skins.

This makes their skins brown or black and protects them against high levels of exposure to the sun, which more frequently result in melanomas in lighter-skinned people.

Not all the effects of pigmentation are advantageous. In cold climates dark skin entails more heat loss by radiation.

Pigmentation also hinders synthesis of vitamin D , so that in areas of poor nutrition darker skinned children are more liable to rickets than lighter skinned children.

Since pigmentation appears to be not entirely advantageous to life in the tropics, other hypotheses about its biological significance have been advanced, for example a secondary phenomenon induced by adaptation to parasites and tropical diseases.

Early humans evolved to have dark skin color around 1. Before the development of hairlessness, early humans had reasonably light skin underneath their fur, similar to that found in other primates.

As some of these original people migrated and settled in areas of Asia and Europe , the selective pressure for eumelanin production decreased in climates where radiation from the sun was less intense.

This eventually produced the current range of human skin color. Of the two common gene variants known to be associated with pale human skin, Mc1r does not appear to have undergone positive selection, [49] while SLC24A5 has undergone positive selection.

As with peoples having migrated northward, those with light skin migrating toward the equator acclimatize to the much stronger solar radiation.

Nature selects for less melanin when ultraviolet radiation is weak. Most people's skin darkens when exposed to UV light, giving them more protection when it is needed.

This is the physiological purpose of sun tanning. Dark-skinned people, who produce more skin-protecting eumelanin, have a greater protection against sunburn and the development of melanoma, a potentially deadly form of skin cancer, as well as other health problems related to exposure to strong solar radiation , including the photodegradation of certain vitamins such as riboflavins , carotenoids , tocopherol , and folate.

Their skin burns and peels rather than tans. This is due to the fact that they produce a defective form of a skin protein Mc1r melanocortin-1 receptor which is necessary for the production of melanin.

They are at a distinct disadvantage in tropical and subtropical environments. Not only do they suffer the discomfort of readily burning, but they are at a much higher risk for skin cancer; the same is true of albinos.

Melanin in the eyes, in the iris and choroid , helps protect them from ultraviolet and high-frequency visible light ; people with gray, blue, and green eyes are more at risk of sun-related eye problems.

Further, the ocular lens yellows with age, providing added protection. However, the lens also becomes more rigid with age, losing most of its accommodation — the ability to change shape to focus from far to near — a detriment due probably to protein crosslinking caused by UV exposure.

Recent research suggests that melanin may serve a protective role other than photoprotection. Thus, it may serve to sequester potentially toxic metal ions, protecting the rest of the cell.

This hypothesis is supported by the fact that the loss of neuromelanin observed in Parkinson's disease is accompanied by an increase in iron levels in the brain.

Evidence exists in support of a highly cross-linked heteropolymer bound covalently to matrix scaffolding melanoproteins. This phenomenon has been attributed in part to foveal sparing in macular degeneration.

From Wikipedia, the free encyclopedia. Group of natural pigments found in most organisms. Not to be confused with Melamine or Melatonin.

CAS Number. PubChem CID. Chemical formula. This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources.

Unsourced material may be challenged and removed. March Learn how and when to remove this template message. Main article: Neuromelanin.

Neural Regeneration Research. Photochemistry and Photobiology. New Journal of Science. Advances in Dermatology and Allergology.

Genetics Home Reference. Retrieved Pigment Cell Research. December Physiological Reviews. Melanin , a dark biological pigment biochrome found in skin, hair, feathers, scales, eyes, and some internal membranes; it is also found in the peritoneum of many animals e.

Formed as an end product during metabolism of the amino acid tyrosine , melanins are conspicuous in dark skin moles of humans; in the black dermal melanocytes pigment cells of most dark-skinned peoples; and as brown, diffuse spots in the epidermis.

Melanism refers to the deposition of melanin in the tissues of living animals. The chemistry of the process depends on the metabolism of the amino acid tyrosine, the absence of which results in albinism , or lack of pigmentation.

Melanism can also occur pathologically, as in a malignant melanoma , a cancerous tumour composed of melanin-pigmented cells.

Melanic pigmentation is advantageous in many ways: 1 It is a barrier against the effects of the ultraviolet rays of sunlight.

On exposure to sunlight, for example, the human epidermis undergoes gradual tanning as a result of an increase in melanin pigment. Many desert-dwelling birds, for example, have black plumage as an adaptation to their abrasive habitat.

This is a striking example of rapid evolutionary change; it has taken place in less than years. It occurs in moth species that depend for their survival by day on blending into specialized backgrounds, such as lichened tree trunks and boughs.

Industrial pollution, in the form of soot, kills lichens and blackens the trees and ground, thus destroying the protective backgrounds of light-coloured moths, which are rapidly picked off and eaten by birds.

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