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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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Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Unrenewable Cells00:50

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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Related Experiment Video

Updated: Sep 8, 2025

Electroretinogram Recording for Infants and Children under Anesthesia to Achieve Optimal Dark Adaptation and International Standards
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Leber Congenital Amaurosis.

Stephen H Tsang1, Tarun Sharma2

  • 1Department of Ophthalmology, Columbia University, New York, NY, USA. sht2@cumc.columbia.edu.

Advances in Experimental Medicine and Biology
|July 30, 2025
PubMed
Summary

Genetic mutations in CEP290 or ICQB1 necessitate renal and neurological assessments. Early evaluation aids in diagnosing Joubert syndrome or Senior Loken syndrome.

Area of Science:

  • Genetics and Molecular Biology
  • Pediatric Neurology
  • Nephrology

Background:

  • CEP290 and ICQB1 gene mutations are associated with rare genetic disorders.
  • Joubert syndrome and Senior Loken syndrome are ciliopathies with significant clinical heterogeneity.

Purpose of the Study:

  • To highlight the importance of specific genetic mutations in identifying at-risk individuals.
  • To recommend timely diagnostic evaluations for suspected cases.

Main Methods:

  • Retrospective analysis of genetic testing results.
  • Review of clinical data for patients with CEP290 or ICQB1 mutations.

Main Results:

  • Patients with CEP290 or ICQB1 mutations presented with symptoms indicative of Joubert syndrome or Senior Loken syndrome.
Keywords:
Autosomal recessiveLeber congenital amaurosis

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  • Early identification of these mutations correlated with the need for comprehensive evaluations.

    • Conclusions:

    • Genetic testing for CEP290 and ICQB1 mutations is crucial for early diagnosis.
    • Renal and neurological evaluations are essential for managing patients with these mutations to detect Joubert syndrome or Senior Loken syndrome.