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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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,...
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Changes in Skin Color: Clinical Perspectives01:14

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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Related Experiment Video

Updated: Sep 18, 2025

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
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Human melanopsin (OPN4) gene polymorphisms: a systematic review.

Kevin R Lucio-Enríquez1, Mariazel Rubio-Valles2, Arnulfo Ramos-Jiménez3

  • 1Chemical Biological Sciences PhD Graduate Program, Department of Chemical Sciences, Biomedical Sciences Institute, Ciudad Juarez Autonomous University, Chihuahua, Mexico.

Frontiers in Neuroscience
|June 25, 2025
PubMed
Summary

Specific OPN4 gene variants are linked to sleep disorders and mood. Further research is needed to understand how these single-nucleotide polymorphisms (SNPs) affect health.

Keywords:
circadian rhythmshumanmelanopsinnon-visual functionpolymorphisms

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Area of Science:

  • Genetics and Ophthalmology
  • Chronobiology
  • Molecular Biology

Background:

  • The melanopsin (OPN4) gene plays a vital role in both visual and non-visual light perception.
  • Single-nucleotide polymorphisms (SNPs) in OPN4 are associated with altered light sensitivity, sleep disturbances, and metabolic issues, indicating a systemic impact of light exposure.

Purpose of the Study:

  • To systematically review existing literature on OPN4 gene variants and their association with health-related conditions.
  • To identify specific OPN4 SNPs linked to various health outcomes and explore potential mechanisms.

Main Methods:

  • A comprehensive literature search was performed in PubMed and ScienceDirect databases.
  • Included studies published between January 1998 and February 2025, using keywords like "Melanopsin," "OPN4," "Polymorphism," and "SNP."
  • Nine studies were selected based on PRISMA guidelines after screening 763 identified publications.

Main Results:

  • Several OPN4 SNPs, including P10L, I394T, and R168C, show associations with affective states, chronotype, and sleep disorders.
  • The P10L variant is linked to seasonal affective disorder (SAD), chronotype, and chronic insomnia.
  • The I394T variant is associated with pupillary light response (PLR) and sleep/wake timing, while R168C is linked to delayed sleep-wake phase disorder (DSWPD).

Conclusions:

  • Specific OPN4 gene SNPs are associated with significant health conditions, particularly sleep and mood disorders.
  • The molecular mechanisms underlying these associations remain largely unexplored.
  • Further research is recommended to investigate the functional impact of these OPN4 variants and identify novel associations.