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Sex-linked Disorders

Sex-linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.

X-linked Traits

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”.

Pedigree Analysis

Pedigree Analysis

Incomplete Dominance

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.

Epistasis

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...

Genetic Lingo

Genetic Lingo

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Related Experiment Video

Updated: May 14, 2025

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

Published on: August 15, 2019

X-linked competition - implications for human development and disease.

Philip M Boone^1,2,3,4, Teresa Buenaventura^5,6, James W D King^5,6

¹Cornelia de Lange Syndrome and Related Disorders Clinic, Boston Children's Hospital, Boston, MA, USA.

Nature Reviews. Genetics

|May 12, 2025

Summary

This summary is machine-generated.

X chromosome inactivation in female mammals creates cell diversity. Differences in X chromosome sequences can cause X-linked competition, impacting development and disease manifestation.

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Area of Science:

Genetics
Developmental Biology
Cell Biology

Background:

X chromosome inactivation (XCI) is a crucial process in early mammalian female development, leading to random silencing of one X chromosome.
This epigenetic silencing is stably maintained through cell divisions, resulting in mosaicism where individual cells express either the maternal or paternal X chromosome.
Recent research has identified X-linked competition, a phenomenon where variations in X chromosome content between cell clones influence organismal development.

Purpose of the Study:

To review current knowledge on X-linked competition.
To identify knowledge gaps and future research directions in X-linked competition.
To explore the implications of X-linked competition for human X-linked diseases.

Main Methods:

Review of existing literature on X chromosome inactivation and cell competition.
Analysis of the mechanisms underlying X-linked competition.
Discussion of phenotypic consequences of skewed X-linked variant representation.

Main Results:

X-linked competition arises from differences in X chromosome sequence content between clones.
This competition can lead to skewed representation of X-linked variants in a cell-type-specific manner.
Skewed representation impacts organismal development and the phenotypic expression of X-linked traits and diseases.

Conclusions:

X-linked competition is a significant factor influencing the manifestation of X-linked diseases in females.
Further research is needed to fully understand the mechanisms and consequences of X-linked competition.
Understanding X-linked competition is critical for predicting and potentially mitigating the impact of X-linked genetic variants.