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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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Mutations01:39

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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.
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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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Mutations in Microorganisms01:18

Mutations in Microorganisms

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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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Alternative RNA Splicing02:18

Alternative RNA Splicing

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
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Spliceosome Mutations in Uveal Melanoma.

Josephine Q N Nguyen1,2, Wojtek Drabarek1,2, Serdar Yavuzyigitoglu1,2

  • 1Department of Ophthalmology, Erasmus MC University Medical Center Rotterdam, 3000 CA Rotterdam, The Netherlands.

International Journal of Molecular Sciences
|December 18, 2020
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Summary

Uveal melanoma (UM) metastasis is linked to mutations in splicing machinery, particularly the SF3B1 gene. These genetic alterations define a unique UM subgroup with late-onset spread, impacting prognosis.

Keywords:
DNA repairchromosomesepigeneticgeneticmetastatic diseasemutational analysisprognosistherapy

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Area of Science:

  • Oncology
  • Genetics
  • Ophthalmology

Background:

  • Uveal melanoma (UM) is the most common primary intraocular cancer with high metastatic potential, frequently spreading to the liver.
  • Genetic mutations, especially in spliceosome components, are crucial for UM classification and predicting metastatic disease.
  • SF3B1 mutations are common in UM and linked to later metastasis onset.

Purpose of the Study:

  • To review genetic and epigenetic factors of spliceosome mutations in uveal melanoma.
  • To highlight the role of SF3B1 mutations in UM tumorigenesis and metastasis.

Main Methods:

  • Literature review focusing on genetic and epigenetic studies of spliceosome mutations in UM.
  • Analysis of existing data on SF3B1 mutations and their association with UM metastasis.

Main Results:

  • Spliceosome mutations, particularly in SF3B1, represent a distinct subgroup of UM.
  • These mutations are associated with late-onset metastatic disease in uveal melanoma patients.
  • UM with spliceosome mutations shares characteristics with other cancers harboring similar mutations.

Conclusions:

  • Spliceosome mutations are significant drivers in a subset of uveal melanoma.
  • Understanding these mutations is key for improved prognostication and targeted therapies in UM.
  • Further research into genetic and epigenetic alterations can refine UM classification and treatment strategies.