Cited by 193melanin and skin pigmentationCalcium signaling and nucleotide metabolismGenetic and rare skin diseases.

The Mouse p (pink‐eyed dilution) and Human P Genes, Oculocutaneous Albinism Type 2 (OCA2), and Melanosomal pH

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H. BRILLIANT, MURRAY·2001·Pigment Cell Research

Abstract

Recessive mutations of the mouse p (pink-eyed dilution) gene lead to hypopigmentation of the eyes, skin, and fur. Mice lacking a functional p protein have pink eyes and light gray fur (if non-agouti) or cream-colored fur (if agouti). The human orthologue is the P protein. Humans lacking a functional P protein have oculocutaneous albinism type 2 (OCA2). Melanocytes from p-deficient mice or OCA2 individuals contain small, minimally pigmented melanosomes. The mouse and human proteins are predicted to have 12 membrane spanning domains and possess significant sequence homology to a number of membrane transport proteins, some of which are involved in the transport of anions. The p protein has been localized to the melanosome membrane. Recently, it has been shown that melanosomes from p protein-deficient melanocytes have an abnormal pH. Melanosomes in cultured melanocytes derived from wild-type mice are typically acidic, whereas melanosomes from p protein-deficient mice are non-acidic. Melanosomes and related endosome-derived organelles (i.e., lysosomes) are thought to have an adenosine triphosphate (ATP)-driven proton pump that helps to generate an acidic lumen. To compensate for the charge of these protons, anions must also be transported to the lumen of the melanosome. In light of these observations, a model of p protein function is presented in which the p protein, together with the ATP-driven proton pump, regulates the pH of the melanosome.

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Crossref · 10.1034/j.1600-0749.2001.140203.x

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Authors
H. BRILLIANT, M.
Venue
Pigment Cell Research
Publisher
Wiley
Published
2001-04
Volume
14
Issue
2
Pages
86-93
ISSN
  • 0893-5785 (ISSN-L)
  • 1600-0749
OpenAlex
W2082571338
Cited by
193
References
87
Citations by year
2026: 4 · 2025: 7 · 2024: 8 · 2023: 3 · 2022: 7 · 2021: 8 · 2020: 12 · 2019: 7 · 2018: 4 · 2017: 6 · 2016: 4 · 2015: 7 · 2014: 10 · 2013: 13 · 2012: 7
FWCI
0.56
Type
journal article
Language
en
Open access
Locations
  • Pigment Cell Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ar045496-04)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01 AR45496)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and rare skin diseases.
Keywords
P protein, OCA2, oculocutaneous albinism type 2, melanocytes, hypopigmentation, anion transport, membrane transporters, lysosomes, endosomes
MeSH terms
Animals, Carrier Proteins, Humans, Hydrogen-Ion Concentration, Melanocytes, Membrane Proteins, Pigmentation, Pigmentation Disorders, Prader-Willi Syndrome, Albinism, Oculocutaneous, Angelman Syndrome, Membrane Transport Proteins, Mice

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