Related Experiment Video
Updated: Jul 23, 2026
07:32
Surgical Method for Virally Mediated Gene Delivery to the Mouse Inner Ear through the Round Window Membrane
Published on: March 16, 2015
Modifier genes of hereditary hearing loss.
T Friedman1, J Battey, B Kachar
1Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, Rockville, Maryland 20850, USA. friedman@nihcd.nih.gov
Current Opinion in Neurobiology
|September 12, 2000
Summary
Modifier genes influence how diseases manifest, even with identical disease alleles. Understanding these genetic modifiers is crucial for developing targeted therapies for conditions like hearing loss.
Area of Science:
- Genetics
- Molecular Biology
- Otolaryngology
Background:
- Phenotypic variation in diseases can arise from genetic factors beyond the primary disease-causing alleles.
- Modifier genes, located at different genetic loci, can significantly influence the expression of disease phenotypes.
- Understanding these genetic interactions is key to unraveling complex diseases.
Purpose of the Study:
- To explore the role of modifier genes in the context of hearing loss.
- To investigate how genetic variations at modifier loci contribute to phenotypic diversity in hearing impairment.
- To lay the groundwork for developing targeted medical therapies for hearing loss based on genetic insights.
Main Methods:
- Functional studies investigating the impact of specific genetic variations on hearing processes.
- Analysis of genotype-phenotype correlations in individuals with hearing loss.
- Comparative genomics to identify potential modifier gene candidates.
Main Results:
- Functional studies are beginning to elucidate the mechanisms by which modifier genes affect hearing.
- Evidence suggests that genetic variations in modifier genes contribute to the spectrum of hearing loss phenotypes.
- These findings highlight the complexity of the genetic architecture of hearing loss.
Conclusions:
- Modifier genes play a significant role in the phenotypic variability observed in hearing loss.
- Further research into these genetic modifiers will enhance our understanding of auditory system function.
- Identifying and characterizing modifier genes will facilitate the rational design of novel therapeutic strategies for hearing loss.
Related Concept Videos
01:11Genetic Lingo
Overview
01:33Pleiotropy
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
01:16In-vitro Mutagenesis
To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
02:30Genomic Imprinting and Inheritance
Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
01:43Incomplete 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.
02:41Lethal 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...
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...