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Genetic Lingo

Genetic Lingo

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X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

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Related Experiment Video

Updated: Sep 8, 2025

Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography

Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography

Published on: August 11, 2016

X-Linked Ocular Albinism.

Benjamin Kuang-Chien Chiang¹, Stephen H Tsang², Tarun Sharma³

¹School of Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.

Advances in Experimental Medicine and Biology

|July 30, 2025

Summary

X-linked ocular albinism (XLOA) affects 1 in 60,000 males, causing permanent vision reduction, photophobia, and nystagmus. This nonprogressive genetic disorder impacts only the eyes, leaving skin and hair color normal.

Keywords:

Albinism Ocular Oculocutaneous X-linked

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Last Updated: Sep 8, 2025

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Area of Science:

Ophthalmology
Genetics
Medical Science

Background:

X-linked ocular albinism (XLOA) is a rare genetic disorder affecting males, with an estimated prevalence of 1 in 60,000.
The condition primarily impacts ocular structures, leading to characteristic visual impairments.
Unlike some other forms of albinism, XLOA does not affect skin or hair pigmentation.

Purpose of the Study:

To summarize the key clinical features and prevalence of X-linked ocular albinism.
To highlight the diagnostic presentation and long-term prognosis of the disorder.

Main Methods:

Literature review of existing studies on X-linked ocular albinism.
Analysis of reported prevalence data and clinical manifestations.

Main Results:

XLOA presents with reduced visual acuity, photophobia, nystagmus, and strabismus.
Impaired stereoscopic vision is common among affected individuals.
Visual impairment is permanent but the condition is nonprogressive, with stable visual acuity over time.

Conclusions:

X-linked ocular albinism is a distinct genetic condition characterized by specific ocular findings.
Early identification and understanding of its nonprogressive nature are crucial for patient management.