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Single Nucleotide Polymorphisms-SNPs01:05

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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CRISPR-Mediated Single Nucleotide Polymorphism Modeling in Rats Reveals Insight Into Reduced Cardiovascular Risk

Atsushi Kitagawa1, Igor Kizub1, Christina Jacob1

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Summary
This summary is machine-generated.

A specific mutation in glucose-6-phosphate dehydrogenase (G6PD) reduces its activity, offering protection against vascular diseases like hypertension and arterial stiffness by altering smooth muscle cell function.

Keywords:
glycolysishypertensionpentose phosphate pathwayratsstiffness

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Area of Science:

  • Biochemistry
  • Genetics
  • Cardiovascular Biology

Background:

  • Epidemiological studies link a specific glucose-6-phosphate dehydrogenase (G6PD) mutation (S188F) common in the Mediterranean region to reduced susceptibility to vascular diseases.
  • The protective mechanism of this G6PD mutation against vascular conditions remains experimentally unverified.

Purpose of the Study:

  • To experimentally validate whether the Mediterranean G6PD mutation (S188F) confers protection against vascular diseases.
  • To elucidate the underlying molecular and cellular mechanisms responsible for this potential protection.

Main Methods:

  • Generated a rat model harboring the G6PD S188F mutation using CRISPR-Cas9 genome editing.
  • Assessed G6PD activity and expression levels in mutant versus wild-type (WT) rats.
  • Performed unbiased metabolomics on arterial tissue to analyze pathway alterations.
  • Evaluated arterial stiffness and hypertension in response to high-fat diet and nitric oxide synthase inhibition.
  • Investigated vascular smooth muscle cell function using a voltage-gated L-type Ca2+ channel agonist (Bay K8644).

Main Results:

  • Rats with the G6PD S188F mutation exhibited significantly reduced G6PD activity (20% of WT) without changes in enzyme expression.
  • Metabolomics revealed downregulation of the pentose phosphate pathway and connected metabolic pathways in the arteries of mutant rats.
  • G6PD S188F mutant rats showed reduced arterial stiffness and hypertension when challenged with a high-fat diet and L-NG-nitroarginine methyl ester.
  • Mutant rats displayed blunted blood pressure response to the L-type Ca2+ channel agonist Bay K8644 compared to WT rats.
  • Findings suggest increased K+ channel expression and decreased voltage-gated Ca2+ channel activity in vascular smooth muscle of mutant rats.

Conclusions:

  • The Mediterranean G6PD S188F mutation reduces enzyme activity, leading to metabolic pathway alterations.
  • This G6PD mutation protects against diet- and drug-induced hypertension and arterial stiffness.
  • The protective effects are mediated by modified vascular smooth muscle cell electrophysiology, specifically altered ion channel activity, shielding against vascular disease risk factors.