Causes of genetic mutations

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Types of Genetic Mutations and Their Causes

Genetic mutations are changes in the DNA sequence that can occur at different levels. These include single gene mutations (point mutations), chromosomal mutations (involving large segments or entire chromosomes), and deep intronic mutations (changes deep within non-coding regions of genes) Evans1988Bhoumik2021Samir2023+1 MORE. Mutations can be inherited from parents or arise spontaneously as de novo mutations during gamete formation or early development Acuna-Hidalgo2016Veltman2012.

Spontaneous vs. Induced Mutations

Mutations can develop spontaneously, without any external trigger, due to errors in DNA replication or repair. Alternatively, they can be induced by external factors known as mutagens, such as ionizing radiation, ultraviolet (UV) light, and certain chemicals Evans1988Bhoumik2021Samir2023. Both spontaneous and induced mutations contribute to genetic diversity and disease risk Shendure2015Banoon2021.

Environmental and Biological Factors

Environmental mutagens, including radiation and chemicals, can damage DNA and increase mutation rates. Endogenous factors, such as reactive metabolites produced within the body, can also cause DNA damage Evans1988Samir2023. Age is another important factor; for example, the number of de novo mutations in offspring increases with advanced paternal age Acuna-Hidalgo2016Francioli2015.

Mechanisms and Patterns of Mutation

Mutations can occur in various forms, such as point mutations (single nucleotide changes), deletions, duplications, inversions, and nonsense mutations (which introduce premature stop codons) Samir2023Mort2008. Some mutations, like those at CpG dinucleotides, are more frequent due to specific chemical processes such as methylation-mediated deamination . Deep intronic mutations can disrupt normal gene splicing and regulatory elements, leading to disease even when exonic regions appear normal .

Consequences of Genetic Mutations

Genetic mutations are a major cause of inherited diseases, including single-gene disorders, chromosomal disorders, and multifactorial diseases Evans1988Bhoumik2021Samir2023+1 MORE. De novo mutations are especially important in severe early-onset disorders like intellectual disability and autism, explaining why these conditions persist in the population despite reducing reproductive fitness Acuna-Hidalgo2016Veltman2012. Somatic mutations, which occur in non-reproductive cells, are a primary cause of cancer and may contribute to other diseases as well Evans1988Shendure2015Samir2023.

Conclusion

Genetic mutations arise from a combination of spontaneous errors, environmental exposures, and biological processes. They can affect single genes, large chromosomal regions, or non-coding DNA, and their frequency is influenced by factors such as age and exposure to mutagens. These mutations are central to genetic diversity, evolution, and the development of many human diseases Evans1988Shendure2015Bhoumik2021+7 MORE.

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Most relevant research papers on this topic

Mutation as a cause of genetic disease.

Gene and chromosomal mutations contribute to inherited and acquired diseases, with exposure to physical or chemical mutagens increasing the incidence of these mutations in cells.

1988·

11citations

·H. Evans

Philosophical transactions of the Royal Society of London. Series B, Biological sciences·

DOI

The origins, determinants, and consequences of human mutations

Recent insights into the rates, spectrum, and determinants of genomic mutations inform our understanding of both Mendelian and complex human diseases, and future research should focus on developing new technologies to access and quantify mutations.

Highly Cited

2015·

154citations

·J. Shendure et al.

Science·

DOI

Genes in Genetic Disease

Gene mutations cause various genetic diseases, with disease susceptibility depending on an individual's genomic confirmation and external exposure.

2021·

0citations

·S. Bhoumik et al.

Biotechnology in the Modern Medicinal System·

DOI

Human DNA Mutations and their Impact on Genetic Disorders.

DNA mutations are common and can cause genetic illnesses like cancer or help humans adapt to their environment, with some common conditions being Alzheimer's, cancer, cystic fibrosis, Down syndrome, and sickle cell disease.

2023·

15citations

·Safia Samir

Recent patents on biotechnology·

DOI

New insights into the generation and role of de novo mutations in health and disease

De novo mutations, predominantly of paternal origin, are a major cause of severe early-onset genetic disorders like intellectual disability and autism spectrum disorder, with their number increasing with advanced paternal age.

Literature ReviewRigorous JournalHighly Cited

2016·

400citations

·R. Acuna-Hidalgo et al.

Genome Biology·

DOI

Genome-wide patterns and properties of de novo mutations in humans

De novo mutations in humans are more frequent in early-replicating genic regions and associated with CpG dinucleotides, transcription-coupled repair, and regional variation in human-chimpanzee divergence.

Rigorous JournalHighly Cited

2015·

387citations

·L. Francioli et al.

Nature genetics·

DOI

Genetic Mutations and Major Human Disorders: A Review

Genetic mutations can cause various human disorders and evolution, with most of these repairs occurring during replication.

2021·

6citations

·S. Banoon et al.

Egyptian Journal of Chemistry·

DOI

Deep intronic mutations and human disease

Deep intronic mutations can cause monogenic disorders and hereditary cancer syndromes, highlighting the importance of studying these sequences for accurate diagnosis.

Literature ReviewRigorous JournalHighly Cited

2017·

399citations

·Rita Vaz-Drago et al.

Human Genetics·

DOI

De novo mutations in human genetic disease

De novo mutations play a prominent role in rare and common neurodevelopmental diseases, contributing to heritability for complex genetic diseases that is not detectable by genome-wide association studies.

Highly Cited

2012·

800citations

·J. Veltman et al.

Nature Reviews Genetics·

DOI

A meta‐analysis of nonsense mutations causing human genetic disease

Nonsense mutations account for 11% of human genetic diseases, with tumor suppressor genes showing a higher proportion of these mutations, and those causing nonsense-mediated mRNA decay are more likely to be clinically relevant.

Meta-AnalysisRigorous JournalHighly Cited

2008·

444citations

·M. Mort et al.

Human Mutation·

DOI

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