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Pedigree Analysis

Pedigree Analysis

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.

Genetic Lingo

Genetic Lingo

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.

Lethal Alleles

Lethal Alleles

Agouti: A Lethal Allele
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...

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”.

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Related Experiment Video

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Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model

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[Hereditary diseases among Yakuts].

V P Puzyrev, N R Maksimova

|December 10, 2008

Summary

Genetic studies reveal Yakut hereditary diseases like spinocerebellar ataxia type I and myotonic dystrophy are highly prevalent in the Sakha population. Molecular data on responsible gene mutations are presented.

Area of Science:

Genetics
Epidemiology
Molecular Biology

Context:

The Republic of Sakha (Yakutia) has a unique population with distinct genetic characteristics.
Several Mendelian diseases exhibit higher prevalence in the Yakut population compared to global averages.
Previous genetic epidemiological studies have identified specific hereditary pathologies within this group.

Purpose:

To identify and characterize Yakut hereditary diseases.
To present data on the molecular basis of these prevalent genetic disorders.
To compare the incidence of these diseases in the Yakut population versus the global population.

Summary:

Genetic epidemiological studies in the Sakha population have identified several Mendelian diseases, termed Yakut hereditary diseases.

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These include spinocerebellar ataxia type I, myotonic dystrophy, oculopharyngeal muscular dystrophy, hereditary enzymopenic methemoglobinemia, and 3-M syndrome.

The study details the molecular nature of mutations underlying these conditions and highlights their elevated prevalence in the Yakut people.

Impact:

Provides crucial insights into the genetic landscape of the Yakut population.
Facilitates understanding of disease etiology and potential therapeutic targets for rare genetic disorders.
Contributes to the field of medical genetics and personalized medicine for isolated populations.