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Mutations in Microorganisms

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...

Mutations

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

Mutations

Mutations

Mutations

Mutations

Spontaneous and Induced Mutations

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

Mismatch Repair

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...

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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

The Human Gene Mutation Database: 2008 update.

Peter D Stenson¹, Matthew Mort, Edward V Ball

¹Institute of Medical Genetics, Cardiff University, Heath Park, Cardiff CF14 4XN, UK.

Genome Medicine

|April 8, 2009

Summary

This summary is machine-generated.

The Human Gene Mutation Database (HGMD) archives germline mutations linked to inherited diseases. It provides a vital resource for researchers and clinicians studying genetic disorders and developing personalized genomics solutions.

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Area of Science:

Genetics
Bioinformatics
Medical Research

Background:

The Human Gene Mutation Database (HGMD) is a key resource for human inherited disease germline mutations.
It has evolved from a scientific study tool to a broadly utilized resource.

Purpose of the Study:

To summarize the history and current resources of the HGMD.
To highlight its expanding utility for diverse scientific and clinical applications.

Main Methods:

Database compilation and curation of germline mutations.
Tracking the accumulation rate of new genetic lesions.

Main Results:

As of December 2008, HGMD contained over 85,000 mutations across 3,253 genes.
New entries were accumulating at over 9,000 per year.

Conclusions:

HGMD serves as an essential, comprehensive database for genetic mutation research.
Its accessibility and ongoing development support advancements in personalized genomics and clinical genetics.