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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
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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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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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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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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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Hyperinsulinism-Causing Mutations Cause Multiple Molecular Defects in SUR1 NBD1.

Claudia P Alvarez1,2, Marijana Stagljar1,2,3, D Ranjith Muhandiram4

  • 1Department of Chemical and Physical Sciences, University of Toronto Mississauga , 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6.

Biochemistry
|March 28, 2017
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Summary
This summary is machine-generated.

Congenital hyperinsulinism mutations in SUR1 NBD1 disrupt protein structure and function, impacting insulin secretion. These findings illuminate the molecular basis of this rare genetic disorder.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • The sulfonylurea receptor 1 (SUR1) protein is a key component of pancreatic ATP-sensitive potassium (KATP) channels.
  • SUR1 mutations are linked to pancreatic disorders, including neonatal diabetes and congenital hyperinsulinism.
  • Congenital hyperinsulinism results from SUR1 mutations that disrupt KATP channel function, leading to excessive insulin secretion.

Purpose of the Study:

  • To structurally characterize the first nucleotide binding domain (NBD1) of SUR1.
  • To investigate the molecular mechanisms of specific congenital hyperinsulinism-associated SUR1 mutations (G716V, R842G, K890T) within NBD1.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Fluorescence spectroscopy
  • Size exclusion chromatography

Main Results:

  • The K890T mutation affects multiple regions of NBD1, including MgATP binding sites and coupling helices, reducing MgATP binding affinity.
  • G716V and R842G mutations lead to in vitro aggregation of SUR1 NBD1, suggesting domain destabilization.
  • These mutations impair the structural integrity and nucleotide-binding capacity of SUR1 NBD1.

Conclusions:

  • The study provides structural insights into SUR1 NBD1 and the molecular basis of congenital hyperinsulinism-causing mutations.
  • Understanding these structural defects is crucial for developing therapeutic strategies for congenital hyperinsulinism.
  • The findings highlight the importance of SUR1 NBD1 structure and function in regulating insulin secretion.