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Related Concept Videos

Mutations01:35

Mutations

41.3K
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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Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

307
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).
307
Point and Frameshift Mutations01:30

Point and Frameshift Mutations

257
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...
257
Lethal Alleles02:41

Lethal Alleles

16.0K
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...
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Cancer-Critical Genes II: Tumor Suppressor Genes01:05

Cancer-Critical Genes II: Tumor Suppressor Genes

8.3K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
8.3K
Mismatch Repair01:20

Mismatch Repair

5.4K
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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Related Experiment Video

Updated: Oct 13, 2025

A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors
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A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors

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The JAK2 mutation.

Salma Merchant1

  • 1Children's Research Institute and the Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, United States.

International Review of Cell and Molecular Biology
|November 10, 2021
PubMed
Summary
This summary is machine-generated.

The JAK2V617F mutation drives myeloproliferative neoplasms (MPNs) by causing overproduction of myeloid cells. Research explores how this single mutation leads to distinct MPN types and affects hematopoietic stem cells.

Keywords:
Clonal diversityClonal hematopoiesisCytokine hypersensitivityHematopoietic stem cellsJAK2V617FMyeloproliferative neoplasm

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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
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Area of Science:

  • Hematology
  • Molecular Biology
  • Oncology

Background:

  • Myeloproliferative neoplasms (MPNs) are clonal hematopoietic stem cell (HSC) disorders characterized by the overproduction of mature myeloid cells.
  • Key MPN subtypes include essential thrombocythemia (ET), polycythemia vera (PV), and primary myelofibrosis (PMF).
  • The JAK2V617F mutation, identified in 2005, is a common driver in the majority of MPN patients.

Purpose of the Study:

  • To elucidate the regulation of JAK2 and the molecular mechanisms by which JAK2V617F induces MPNs.
  • To investigate factors contributing to the phenotypic diversity observed in MPNs.
  • To understand the effects of the JAK2V617F mutation on hematopoietic stem cells (HSCs).

Main Methods:

  • Review of existing literature on JAK2 regulation and JAK2V617F-mediated MPN pathogenesis.
  • Analysis of in vivo models to study MPN pathophysiology and HSC behavior.
  • Examination of data from modern sequencing technologies to understand mutational landscape and clonal architecture.

Main Results:

  • The JAK2V617F mutation leads to constitutive activation of JAK-STAT pathways, promoting cytokine-independent cell proliferation.
  • In vivo models suggest JAK2V617F alone may not be sufficient to confer increased HSC self-renewal, questioning its sole role in clonal advantage.
  • Advanced sequencing reveals complex mutational landscapes and clonal architectures in MPN patients.

Conclusions:

  • While JAK2V617F is central to MPN development, the precise mechanisms leading to distinct disease entities (ET, PV, PMF) remain under investigation.
  • Factors like JAK2V617F allele burden, differential STAT signaling, and host genetic modifiers likely contribute to MPN heterogeneity.
  • Further research is needed to fully understand the role of JAK2V617F in HSC function and its contribution to MPN pathogenesis.