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Related Concept Videos

Point and Frameshift Mutations01:30

Point and Frameshift Mutations

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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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Spontaneous and Induced Mutations01:30

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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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Mismatch Repair01:20

Mismatch Repair

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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.
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Mutations in Microorganisms01:18

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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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Targeted Cancer Therapies

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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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Genome Copying Errors

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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Cystic Fibrosis (CF) is a genetic disorder caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. These mutations lead to absent or impaired CFTR protein function, impacting various organs.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Physiology

Background:

  • Cystic Fibrosis (CF) is an inherited disorder caused by mutations in the CFTR gene.
  • Mutant CFTR genes result in absent or impaired CFTR protein activity.
  • This dysfunction affects ion transport, leading to disease manifestations.

Discussion:

  • The CFTR protein is a crucial ion channel regulating fluid and electrolyte balance.
  • Mutations disrupt its function, causing thick, sticky mucus buildup.
  • This mucus obstructs airways and ducts in multiple organs.

Key Insights:

  • Understanding CFTR gene mutations is key to CF pathogenesis.
  • CFTR protein dysfunction underlies the diverse clinical symptoms of CF.
  • Research focuses on the molecular mechanisms of CFTR defects.

Outlook:

  • Targeting CFTR protein function offers therapeutic avenues.
  • Developing effective treatments for CF relies on comprehending CFTR biology.
  • Future research aims to address the full spectrum of CFTR-related disorders.