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Related Concept Videos

Genetic Lingo01:11

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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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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...
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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.
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[Hereditary pigmentary disorders].

K Giehl1, M Braun-Falco

  • 1Klinik und Poliklinik für Dermatologie und Allergologie, Ludwig-Maximilians-Universität München, Frauenlobstr. 9-11, 80337, München, Deutschland. kathrin.giehl@med.uni-muenchen.de

Der Hautarzt; Zeitschrift Fur Dermatologie, Venerologie, Und Verwandte Gebiete
|June 18, 2010
PubMed
Summary
This summary is machine-generated.

Genetic pigmentary disorders arise from alterations in over 100 genes affecting skin pigmentation. Understanding these genetic factors is key to diagnosing and potentially treating rare conditions impacting melanin production and melanosome transfer.

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Area of Science:

  • Human genetics
  • Dermatology
  • Molecular biology

Context:

  • Human skin pigmentation is a complex trait influenced by over 100 genes.
  • Genetic pigmentary disorders are rare conditions with diverse molecular bases.
  • These disorders involve anomalies in melanocyte number, melanin synthesis, or melanosome dynamics.

Purpose:

  • To elucidate the genetic underpinnings of pigmentary disorders.
  • To categorize pigmentary disorders based on their molecular pathogenesis and clinical presentation.
  • To differentiate genetic pigmentary disorders from other conditions with similar symptoms.

Summary:

  • Pigmentary disorders result from genetic variations affecting melanin production, melanocyte function, or melanosome transport.
  • Disorders are classified as hyperpigmentation (diffuse, reticular, localized) or hypopigmentation (diffuse, localized).
  • Examples of hypopigmentation include albinism and Griscelli syndrome; hyperpigmentation requires differentiation from endocrinopathies.

Impact:

  • Advances understanding of the genetic basis of skin pigmentation.
  • Aids in the diagnosis and classification of rare genetic pigmentary disorders.
  • Provides a framework for distinguishing pigmentary disorders from other systemic conditions.