- Oculocutaneous albinism
Oculocutaneous albinism Classification and external resources ICD-10 E70.3 ICD-9 270.2 MeSH D016115
Common Albinism requires genes from both parents, while Oculocutaneous albinism only need a gene directly from a mother to her son.
Name OMIM Gene Description OCA1 203100 TYR OCA1 is caused by an alteration of the tyrosinase gene, and can occur in two variations. The first is OCA1a, and means that the organism cannot develop pigment at all. The hair is usually white (often translucent) and the skin very pale. Vision usually ranges from 20/200 to 20/400. The second is OCA1b, which has several subtypes itself. Some individuals with OCA1b can tan and also develop pigment in the hair.[verification needed] One subtype of OCA1b is called OCA1b TS (temperature sensitive), where the tyrosinase can only function below a certain temperature, which causes the body hair in cooler body regions to develop pigment (i.e. get darker). (An equivalent mutation produces the coat pattern in Siamese cats.) Another variant of OCA1b, called Albinism, yellow mutant type (OMIM: 606952) is more common among the Amish than in other populations, and results in blonde hair and the eventual development of skin pigmentation during infancy, though at birth is difficult to distinguish from other types. About 1 in 40,000 people have some form of OCA1. OCA2 203200 OCA2 The most common type of albinism, is caused by mutation of the P gene. People with OCA2 generally have more pigment and better vision than those with OCA1, but cannot tan like some with OCA1b. A little pigment can develop in freckles or moles. People with OCA2 usually have fair skin but often not as pale as OCA1, and pale blonde to golden, reddish-blonde, or even brown hair, and most commonly blue eyes. Affected people of African descent usually have a different phenotype (appearance): yellow hair, pale skin, and blue, gray or hazel eyes. About 1 in 15,000 people have OCA2. The gene MC1R doesn't cause OCA2, but does affect its presentation. OCA3 203290 TYRP1 Has only been partially researched and documented. It is caused by mutation of the tyrosinase-related protein-1 (Tyrp1) gene. Cases have been reported in Africa and New Guinea. Affected individuals typically have red hair, reddish-brown skin and blue or gray eyes. Variants may include rufous oculocutaneous albinism (ROCA or xanthism) (OMIM: 278400). The incidence rate of OCA3 is unknown. OCA4 606574 SLC45A2 Is very rare outside of Japan, where OCA4 accounts for 24% of albinism cases. OCA4 can only be distinguished from OCA2 through genetic testing, and is caused by mutation of the membrane-associated transporter protein (MATP) gene. Several German patients were identified in 2004.
- GeneReviews/NCBI/NIH/UW entry on Oculocutaneous Albinism Type 1
- GeneReviews/NCBI/NIH/UW entry on Oculocutaneous Albinism Type 2
- GeneReviews/NCBI/NIH/UW entry on Oculocutaneous Albinism Type 4
- ^ a b "Oculocutaneous albinism - Genetics Home Reference". http://ghr.nlm.nih.gov/condition=oculocutaneousalbinism.
- ^ Grønskov K, Ek J, Brondum-Nielsen K (2007). "Oculocutaneous albinism". Orphanet Journal of Rare Diseases 2: 43. doi:10.1186/1750-1172-2-43. PMC 2211462. PMID 17980020. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2211462.
- ^ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
- ^ "Abino People - Albinism in Humans". Philippine General Hospital. http://www.albinopeople.org/. Retrieved September 2011.
- ^ a b "Facts about Albinism", by Dr. Richard King et al.
- ^ Giebel LB, Tripathi RK, King RA, Spritz RA (March 1991). "A tyrosinase gene missense mutation in temperature-sensitive type I oculocutaneous albinism. A human homologue to the Siamese cat and the Himalayan mouse". The Journal of Clinical Investigation 87 (3): 1119–22. doi:10.1172/JCI115075. PMC 329910. PMID 1900309. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=329910.
- ^ a b c d e Online Mendelian Inheritance in Man Database, at Johns Hopkins University (see also Mendelian Inheritance in Man for more information about this source).
- ^ "Ocular Manifestations of Albinism", by Dr. Mohammed O. Peracha, at eMedicine, 13 September 2005; retrieved 31 March 2007
- ^ a b c d "Albinism", by Dr. Raymond E. Boissy, Dr. James J. Nordlund, et al., at eMedicine, 22 August 2005; retrieved 31 March 2007
- ^ Rundshagen U, Zühlke C, Opitz S, Schwinger E, Käsmann-Kellner B (February 2004). "Mutations in the MATP gene in five German patients affected by oculocutaneous albinism type 4". Human Mutation 23 (2): 106–10. doi:10.1002/humu.10311. PMID 14722913.
Inborn error of amino acid metabolism (E70–E72, 270) K→acetyl-CoALysine/straight chainHypertryptophanemia GG→pyruvate→citrateG→glutamate→
IE of RTT
Other Pigmentation disorders/Dyschromia (L80–L81, 709.0) Hypo-/
leucismLoss of melanocytesLoss of melanin/
amelanismCross syndrome · ABCD syndrome · Albinism–deafness syndrome · Idiopathic guttate hypomelanosis · Phylloid hypomelanosis · Progressive macular hypomelanosisLeukoderma w/o
hypomelanosisVasospastic macule · Woronoff's ring · Nevus anemicusUngrouped
Hyper-ReticulatedDermatopathia pigmentosa reticularis · Pigmentatio reticularis faciei et colli · Reticulate acropigmentation of Kitamura · Reticular pigmented anomaly of the flexures · Naegeli–Franceschetti–Jadassohn syndrome · Dyskeratosis congenita · X-linked reticulate pigmentary disorder · Galli–Galli disease · Revesz syndromeDiffuse/
Lentigo/Lentiginosis: Lentigo simplex · Liver spot · Centrofacial lentiginosis · Generalized lentiginosis · Inherited patterned lentiginosis in black persons · Ink spot lentigo · Lentigo maligna · Mucosal lentigines · Partial unilateral lentiginosis · PUVA lentiginesMelasma · Erythema dyschromicum perstans · Lichen planus pigmentosus · Café au lait spot · Poikiloderma (Poikiloderma of Civatte · Poikiloderma vasculare atrophicans) · Riehl melanosisLinearOther/ungroupedAcanthosis nigricans (Acral acanthotic anomaly) · Freckle · Familial progressive hyperpigmentation · Pallister–Killian syndrome · Periorbital hyperpigmentation · Photoleukomelanodermatitis of Kobori · Postinflammatory hyperpigmentation · Transient neonatal pustular melanosisOther
pigmentsiron: Hemochromatosis · Iron metallic discoloration · Pigmented purpuric dermatosis (Schamberg disease, Majocchi's disease, Gougerot–Blum syndrome, Doucas and Kapetanakis pigmented purpura/Eczematid-like purpura of Doucas and Kapetanakis, Lichen aureus, Angioma serpiginosum) · Hemosiderin hyperpigmentationother metals: Argyria · Chrysiasis · Arsenic poisoning · Lead poisoning · Titanium metallic discoloration
DyschromatosesDyschromatosis symmetrica hereditaria · Dyschromatosis universalis hereditaria
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oculocutaneous albinism — (OCA) albinism characterized by partial or total absence of melanin from the melanocytes of the skin, hair, and eyes, with additional ocular defects including hypoplastic fovea, photophobia, nystagmus, and decreased visual acuity. There are a… … Medical dictionary
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temperature-sensitive oculocutaneous albinism — a phenotypic variant of oculocutaneous albinism type 1b in which activity of the abnormal tyrosinase ceases above 35°C, so that the hair on warmer areas of the body is light and becomes progressively darker on the cooler areas (the extremities) … Medical dictionary
tyrosinase-positive oculocutaneous albinism — oculocutaneous a. type 2 … Medical dictionary
yellow mutant oculocutaneous albinism — oculocutaneous a. type 1b … Medical dictionary
tyrosinase-negative oculocutaneous albinism — (ATN) oculocutaneous a. type 1a … Medical dictionary
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