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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,...

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).

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

Point and Frameshift Mutations

Point and Frameshift Mutations

Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...

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Yeast As a Chassis for Developing Functional Assays to Study Human P53

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Analysis of mutation effects on PIDDosome core complex.

Tae-Ho Jang¹, En Kyung Seo, Hyun Ho Park

¹School of Biotechnology and Graduate School of Biochemistry at Yeungnam University, Gyeongsan, South Korea.

Applied Biochemistry and Biotechnology

|March 16, 2013

Summary

Researchers identified dominant-negative mutations in RAIDD DD, a component of the PIDDosome complex. These findings may offer new therapeutic strategies for diseases linked to apoptosis.

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In Vivo Modeling of the Morbid Human Genome using Danio rerio

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Published on: August 24, 2013

Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

The PIDDosome is a molecular complex that activates caspase-2, initiating apoptosis in response to genotoxic stress.
It comprises three key proteins: PIDD (Platform for Interaction and Degradation Domain), RAIDD (RIP-Associated Ich1/Caspase Inhibitor Domain), and caspase-2.
The structural assembly involves the interaction of death domains (DD) from RAIDD and PIDD.

Purpose of the Study:

To investigate the functional impact of specific mutations within the RAIDD death domain (RAIDD DD) of the PIDDosome complex.
To identify dominant-negative mutants that could provide insights into PIDDosome regulation and disease mechanisms.

Main Methods:

Structural-based mutagenesis was employed to generate mutations in the RAIDD DD.
The functional effects of these mutations were assessed, focusing on their ability to inhibit PIDDosome activity.

Main Results:

Two specific mutations, Q169E and R170A, within the RAIDD DD were identified as dominant-negative.
These dominant-negative mutants interfere with the normal function of the PIDDosome complex.

Conclusions:

The identification of dominant-negative mutants in RAIDD DD offers a novel tool for studying PIDDosome function.
These findings have potential implications for understanding diseases associated with dysregulated apoptosis and for developing targeted therapeutic interventions.