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Author: Vanessa Ngan, Staff Writer, 2002. Updated by Dr Harriet Cheng, June 2014.
Albinism is a condition in which people have little or no melanin pigment (compound that creates colour) in their eyes, skin or hair. Because of this people with albinism look a little different from other members of their family without albinism. They have very fair skin, which is prone to sunburn, their hair is white or a very light colour, and they may squint a lot as their eyes are sensitive to sunlight.
There are two main categories of albinism:
Oculocutaneous albinism (OCA) make up a group of different types of albinism based on the specific albinism gene involved. Oculocutaneous albinism type 1 and type 2 are the most common types of oculocutaneous albinism.
|Subtype||Gene defect||Clinical features|
|OCA 1A||Absent tyrosinase activity||
|OCA 1B||Reduced tyrosinase activity||
|OCA 2||OCA 2 mutation (previously P gene)||
|OCA 3||TYRP 1 mutation||
|OCA 4||SLC45A2 mutation (previously MAPT)||
Prenatal testing for OCA is available in some centres.
Other less common types:
Albinism is mostly a recessively inherited disease, which means two albinism genes are inherited (one from each parent). If the patient's parents are only carriers of albinism (each having one albinism gene and one normal gene), they will have enough genetic information to make normal pigment and will not show any signs of albinism.
Albinism occurs worldwide and affects people of all races. Males and females alike can have the condition although ocular albinism occurs primarily in males.
About 1 in 70 people have a gene for albinism. Couples whom are each carriers of the recessive albinism gene have a 1 in 4 chance of producing a child with albinism.
The main problems of albinism are caused by the inability of the body to produce melanin pigment (whose major role in the skin is to absorb UV light from the sun so skin is not sun-damaged). It also has a role in the development of normal vision of the eye. Having white or light coloured hair due to lack of melanin is no cause for concern, however, lack of melanin in the skin and eyes can cause the following problems:
Other less common types of albinism may also involve problems with blood clotting, immune deficiency or problems with hearing.
One concern that should not be overlooked is the risk of isolation in people with albinism. People with albinism, especially children need to be treated normally and included in all activities. They develop normally and have normal intelligence, it is a myth that people with albinism are mentally impaired or intellectually-challenged.
It is important for people with albinism to protect themselves from UV exposure and thus prevent the damaging effects it can have on the skin.
Because the patient has no, or little, pigmentation, skin cancers will often have no or little pigmentation. Patients with albinism should promptly report suspicious spots or growths to a doctor.
Specialist eye doctors cannot cure eye problems but can help with various optical aids to improve vision for people with albinism.
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