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Mutations01:39

Mutations

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Mutations01:35

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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
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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 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 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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Characterizing Mutational Load and Clonal Composition of Human Blood
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A mutation of the human

Eliane Berrou1, Christelle Soukaseum1, Rémi Favier2

  • 1INSERM Unité Mixte de Recherche (UMR) S 1176, Université Paris-Sud, Université Paris-Saclay, Le Kremlin Bicêtre, France.

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Summary
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A novel EPHB2 gene variant causes inherited platelet dysfunction, impairing platelet aggregation and signaling pathways like GPVI and GPCR. This discovery highlights EPHB2

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Area of Science:

  • Hematology
  • Molecular Biology
  • Genetics

Background:

  • The ephrin receptor B2 (EPHB2) tyrosine kinase is implicated in platelet function.
  • Inherited platelet disorders can lead to significant bleeding risks.
  • Understanding specific gene variants and their impact on platelet signaling is crucial for diagnosis and treatment.

Purpose of the Study:

  • To identify the genetic cause of a novel inherited platelet disorder.
  • To investigate the functional consequences of an identified EPHB2 gene variant on platelet activation and signaling.
  • To elucidate the role of EPHB2 in platelet function, particularly its crosstalk with other signaling pathways.

Main Methods:

  • Whole-exome sequencing was performed on affected siblings and their parents.
  • Functional platelet assays were conducted, including aggregation, activation (αIIbβ3), granule secretion, and thrombus formation under flow.
  • Cell-based assays using RBL-2H3 cells expressing GPVI were employed to study EPHB2 variant effects on signaling.

Main Results:

  • A homozygous c.2233C>T (p.R745C) missense variant in the EPHB2 gene was identified in affected siblings.
  • The p.R745C variant impaired platelet aggregation, αIIbβ3 activation, granule secretion, and thrombus formation.
  • EPHB2 R745C significantly disrupted initial steps of glycoprotein VI (GPVI) and PAR4-AP signaling pathways, including Lyn, Syk, and Src phosphorylation.

Conclusions:

  • A novel inherited platelet disorder is caused by a specific EPHB2 gene variant (p.R745C).
  • EPHB2 plays a critical role in platelet activation, particularly through its involvement in GPVI and G-protein-coupled receptor (GPCR) signaling.
  • This finding expands our understanding of the molecular basis of inherited platelet disorders and the function of EPHB2 in hemostasis.