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Transcript of Albinism
What is it ???
Defect of melanin production that results in little or no pigment in skin, hair, and eyes.
Involves the eyes, hair and skin.
Genes for OCA are located on the autosomal chromosomes.
Since albinism is a recessive trait, if only one of the 2 copies of OCA is functional, a person can make pigment but will carry "albinism trait"
Both parents must carry defective OCA gene in order to have a child with albinism
If both parents carry defective gene and neither have albinism, there's 1/4 chance baby will be born with albinism.
Involved primarily the eyes.
Gene is on "x" chromosome
Males need to inherit one defective copy of "x" chromosomes from the mother (carrier) in order to have albinism.
Produced by cells called melanocites.
Determines the color of your hair, skin and eyes.
Plays a role in the development of certain optical nerves.
2 Types of Albinism
Body Parts Affected
The most recognizable form of albinism results in milky white skin.
For some people, melanin production may begin or increase during childhood and adolescence, resulting in slight changes in pigmentation.
Exposure to the sun can result in freckles, Moles, or lentigines for some people.
People with Albino have a greater chance of sun burn and skin cancer.
Hair color can range from very white to brown.
People of African or Asian descent who have albinism may have hair color that is yellow, reddish or brown.
Almost all people with Albinism have low vision that cannot be curable with glasses.
Many are legally blind, some have sufficient vision enough to drive a car.
Vision problems occur from abnormal development of retina and abnormal patterns of nerve connection between the brain and eye.
An eye examination is used to detect albinism because the presence of eye problems defines the diagnosis of albinism.
Consists of visual rehabilitation and optical aids.
Tinted sunglasses are used outdoors because they are sensitive to glare.
Some use bifocals, prescription reading glasses, or hand held magnifiers to increase their vision.
Back in medieval times, people would often kill albinos because they were known to take part in witchcraft.
Most children born with albinism are born to parents with normal hair or eye color for their ethnic background.
Albinism affects people from all races and cannot be prevented because it is a genetic disorder.
Primary determinant of skin color.
Found in hair and pigmented tissue underlying iris of the eye.
Produced by melanocytes which are found in basal layer of the epidermis.
Melanocytes express the melanin producing genes
When there is little or no melanin in body, that's known as albinism.
Albinism does not affect the life span of a person
The growth and development of a person with Albinism is the same as a normal person.
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