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Mutations

Mutations

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...

Viral Mutations

Viral Mutations

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...

Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

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).

Seedless Vascular Plants

Seedless Vascular Plants

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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,...

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Related Experiment Video

Updated: Jan 28, 2026

A Patient-Derived Xenograft Model for Venous Malformation

A Patient-Derived Xenograft Model for Venous Malformation

Published on: June 15, 2020

PIK3CA mutations in vascular malformations.

Sandra D Castillo¹, Eulalia Baselga², Mariona Graupera^1,3

¹Vascular Signalling Laboratory, Program Against Cancer Therapeutic Resistance (ProCURE), Institut d'Investigació Biomèdica de Bellvitge (IDIBELL).

Current Opinion in Hematology

|March 12, 2019

Summary

This summary is machine-generated.

Oncogenic PIK3CA gene mutations cause lymphatic and venous malformations. Research into PI3K inhibitors offers new therapeutic strategies for these rare diseases, potentially treating them as developmental tumors.

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Area of Science:

Genetics and Molecular Biology
Vascular Biology
Oncology

Background:

A subset of vascular malformations, specifically lymphatic and venous types, are linked to oncogenic mutations in the PIK3CA gene.
Understanding the molecular and cellular impact of these mutations is crucial for developing targeted therapies.

Purpose of the Study:

To review recent findings on the role of oncogenic PIK3CA mutations in vascular malformation pathogenesis.
To highlight the development of in-vitro and in-vivo tools for studying PIK3CA-mutant vascular malformations.
To examine advances in phosphoinositide 3-kinase (PI3K) inhibitors and their potential repurposing for treating lymphatic and venous malformations.

Main Methods:

Literature review of recent findings in PIK3CA-related vascular malformations.
Analysis of in-vitro and in-vivo preclinical models for drug testing.
Review of current clinical data on PI3K inhibitors.

Main Results:

PIK3CA mutations are key drivers in specific lymphatic and venous malformations.
Preclinical models are advancing the study of these conditions and drug efficacy.
PI3K inhibitors show promise for therapeutic repurposing.

Conclusions:

Research in cancer genetics can inform the study of PIK3CA-related vascular malformations.
Repurposing PI3K inhibitors from cancer trials offers a novel treatment strategy.
Lymphatic and venous malformations may be considered developmental tumors.