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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Related Experiment Video

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Genetic Associations With an Amyotrophic Lateral Sclerosis Reversal Phenotype.

Jesse I Crayle1, Evadnie Rampersaud1, Jason R Myers1

  • 1From the Department of Neurology (J.I.C., R.S.B.), Duke University School of Medicine, Durham, NC; Department of Neurology (J.I.C.), Washington University in Saint Louis, MO; Center for Applied Bioinformatics (E.R., J.R.M., G.W.), St. Jude Children's Research Hospital, Memphis, TN; Department of Neurology (J.W., M.B.), University of Miami Miller School of Medicine, FL; and Department of Cell and Molecular Biology (J.P.T.), St. Jude Children's Research Hospital, Memphis, TN.

Neurology
|July 30, 2024
PubMed
Summary

This genome-wide association study identified a genetic link between ALS Reversal and IGFBP7 expression. Further research into IGF-1 signaling may offer new therapeutic avenues for amyotrophic lateral sclerosis.

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Area of Science:

  • Genetics
  • Neuroscience
  • Genomics

Background:

  • Amyotrophic lateral sclerosis (ALS) reversal is a rare phenomenon where patients improve after diagnosis.
  • Understanding the genetic underpinnings of ALS reversal is crucial for developing new treatments.

Purpose of the Study:

  • To conduct a genome-wide association study (GWAS) to identify genetic factors associated with the ALS Reversal phenotype.
  • To explore the biological relevance of identified genetic variants.

Main Methods:

  • Whole-genome sequencing (WGS) of 22 ALS Reversal patients compared to 103 ALS patients (CReATe Consortium) and 140 ALS patients (Target ALS).
  • Statistical analysis to identify significant genetic loci, followed by fine-mapping and exploration of regulatory elements.
  • Expression quantitative trait loci (eQTL) analysis to assess the impact of genetic variants on gene expression.

Main Results:

  • A significant association was found between the ALS Reversal phenotype and a noncoding single nucleotide variant (SNV) in the IGFBP7 gene locus (rs4242007).
  • This SNV was linked to decreased IGFBP7 expression in the frontal cortex and was present in a homozygous state in 3 ALS Reversal patients but none of the control group.
  • A second locus near GRIP1 showed potential association, but its functional impact on gene transcription remains unclear.

Conclusions:

  • A significant genetic association exists between the ALS Reversal phenotype and an IGFBP7 regulatory variant.
  • IGFBP7's role as an inhibitor of the insulin growth factor-1 (IGF-1) receptor suggests the IGF-1 pathway as a potential neuroprotective therapeutic target for ALS.
  • Despite small sample size, these findings warrant further investigation into IGF-1 signaling for ALS treatment strategies.