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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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Cancers Originate from Somatic Mutations in a Single Cell02:21

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Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
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Gene Conversion02:08

Gene Conversion

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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

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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).
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Differentiation of Common Myeloid Progenitor Cells01:15

Differentiation of Common Myeloid Progenitor Cells

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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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[Driver Mutations in Acute Myeloid Leukemia with Inversion of Chromosome 16].

L G Ghukasyan1, G S Krasnov1, O V Muravenko1

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia.

Molekuliarnaia Biologiia
|June 4, 2020
PubMed
Summary
This summary is machine-generated.

This study investigated mutations in pediatric acute myeloid leukemia with inv(16). Key signaling pathway genes like KIT and NRAS were frequently mutated, contributing to leukemogenesis.

Keywords:
acute myeloid leukemiainversion 16massive parallel sequencingsomatic mutations

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Area of Science:

  • Hematology
  • Oncology
  • Genetics

Background:

  • Acute myeloid leukemia (AML) subtypes arise from genetic events disrupting cell differentiation and proliferation.
  • Chromosomal abnormalities, like inversion 16 (inv(16)), are linked to specific mutation patterns in AML.
  • The precise role of mutations in AML pathogenesis, particularly in inv(16) cases, requires further elucidation.

Purpose of the Study:

  • To identify driver mutation events in pediatric AML with the specific CBFB-MYH11 fusion gene resulting from inv(16).
  • To investigate the spectrum of somatic mutations in genes encoding intracellular signaling proteins.
  • To assess the role of identified mutations in the leukemogenesis of inv(16) AML.

Main Methods:

  • Genomic DNA from 12 pediatric AML patients with inv(16) was analyzed.
  • Target enrichment was used to sequence the coding regions of 84 cancer-associated genes.
  • Comparative analysis of diagnostic and remission samples was performed to evaluate mutation roles.

Main Results:

  • Somatic mutations were frequently detected in genes of receptor tyrosine kinase signaling pathways.
  • KIT (41%), NRAS (25%), KRAS (17%), and FLT3 (8.3%) showed significant mutation frequencies.
  • Novel mutations in KDM6A, NOTCH1, and IDH1 genes, potentially involved in leukemogenesis, were identified.

Conclusions:

  • Specific signaling pathway mutations are prevalent in pediatric AML with inv(16).
  • Mutations in KIT, NRAS, KRAS, and FLT3 play a crucial role in the pathogenesis of this AML subtype.
  • The newly identified mutations in KDM6A, NOTCH1, and IDH1 warrant further investigation for their role in AML development.