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Related Concept Videos

Mutations01:39

Mutations

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Overview
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Mutations01:35

Mutations

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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...
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Viral Mutations00:36

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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Mutations in Microorganisms01:18

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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,...
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Point and Frameshift Mutations01:30

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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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Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
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STAT1 and STAT3 mutations: important lessons for clinical immunologists.

Peter Olbrich1,2, Alexandra F Freeman3

  • 1a Sección de Infectología, Reumatologíe e Inmunología Pediátrica (SIRIP) , Hospital Infantil Universitario Virgen del Rocío , Seville , Spain.

Expert Review of Clinical Immunology
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PubMed
Summary

Germline mutations in signal transducer and activator of transcription (STAT) 1 and STAT3 cause complex diseases affecting both immune and nonimmune functions. Understanding these STAT mutations aids in diagnosing and managing rare patient conditions.

Keywords:
Gain of function (GOF) STAT1Job’s syndromeLOF STAT3chronic mucocutaneous candidiasisgain of function (GOF) STAT3hyper IgE syndromeloss of function (LOF) STAT1

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Area of Science:

  • Molecular Biology
  • Immunology
  • Genetics

Background:

  • Signal transducer and activator of transcription (STAT) 1 and STAT3 are crucial for immune and nonimmune cellular functions.
  • Germline mutations leading to STAT1/STAT3 loss-of-function (LOF) or gain-of-function (GOF) result in complex clinical presentations.
  • These presentations include susceptibility to infections, immune dysregulation, and nonimmune features.

Purpose of the Study:

  • To provide a comprehensive overview of STAT1 and STAT3 mutation-related disorders.
  • To cover mechanistic concepts, clinical manifestations, diagnostics, and treatment strategies.
  • To assist clinical immunologists in managing these rare diseases.

Main Methods:

  • Literature review of clinical and research papers identified via PubMed searches.
  • Synthesis of existing knowledge on STAT1 and STAT3 mutations.
  • Inclusion of expert opinions.

Main Results:

  • Recent years have shown significant advancements in understanding the clinical descriptions and pathogenesis of STAT1/STAT3 GOF and LOF diseases.
  • Knowledge regarding the pathophysiology of these transcription factor regulators has expanded.
  • Complex clinical symptoms arise depending on the specific mutation type.

Conclusions:

  • Further harmonization of laboratory testing and international cohort follow-up is essential.
  • Increased knowledge of natural history and development of targeted therapies are needed.
  • Improved understanding and management of these rare STAT-related disorders are critical for patient care.