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Related Concept Videos

Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Changes in Skin Color: Clinical Perspectives01:14

Changes in Skin Color: Clinical Perspectives

The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Epistasis01:39

Epistasis

In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
Pleiotropy01:33

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...

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Related Experiment Video

Updated: Jun 15, 2026

Reverse Genetic Approach to Identify Regulators of Pigmentation using Zebrafish
07:16

Reverse Genetic Approach to Identify Regulators of Pigmentation using Zebrafish

Published on: March 1, 2022

Recent progresses in understanding pigmentation.

M G Kosmadaki1, A Naif, Park Hee-Young

  • 1Department of Dermatology, Boston University School of Medicine, MA 02118, USA.

Giornale Italiano Di Dermatologia E Venereologia : Organo Ufficiale, Societa Italiana Di Dermatologia E Sifilografia
|March 4, 2010
PubMed
Summary

Human pigmentation involves melanin production by melanocytes and melanosome transfer. Recent advances in molecular biology offer new insights into regulating pigmentation and treating pigmentary disorders.

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Area of Science:

  • Cell Biology
  • Genetics
  • Dermatology

Background:

  • Human pigmentation is a complex process involving melanin synthesis and transfer from melanocytes to keratinocytes.
  • Melanin production, or melanogenesis, begins with the amino acid L-tyrosine within specialized organelles called melanosomes.
  • Variations in melanocyte activity and melanosome transfer contribute to diverse pigmentary phenotypes.

Purpose of the Study:

  • To review recent advancements in understanding the molecular and cellular mechanisms of human pigmentation.
  • To explore the implications of these advances for treating pigmentary disorders.

Main Methods:

  • Review of modern molecular biology techniques.
  • Analysis of findings from transgenic animal models.
  • Examination of current literature on pigmentation regulation.

Main Results:

  • Significant progress has been made in elucidating the molecular regulation of human pigmentation.
  • Understanding of melanosome formation, melanin synthesis, and melanosome transfer has been enhanced.
  • New therapeutic targets for pigmentary disorders are emerging from these research advances.

Conclusions:

  • Recent molecular and cellular biology research has greatly improved our understanding of human pigmentation.
  • These discoveries hold promise for developing novel treatments for various pigmentary disorders.