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How Genomic and Structural Context Could Shape JAK-STAT Variant Pathogenicity.

Markus Hoffmann1, Hye Kyung Lee2

  • 1Department of Biochemistry and Molecular & Cellular Biology, Georgetown University Medical Centerhttps://ror.org/05vzafd60, Washington, DC, USA.

Twin Research and Human Genetics : the Official Journal of the International Society for Twin Studies
|March 31, 2026
PubMed
Summary
This summary is machine-generated.

Investigating Janus kinase (JAK)-Signal Transducer and Activator of Transcription (STAT) pathway mutations reveals disease links. Structural and biochemical factors are key to understanding variant pathogenicity in these critical signaling proteins.

Keywords:
All of Us databaseCOSMICClinVarDisease-associated variantsJAK-STAT pathwayMissense mutationsProtein structureSNPs

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Area of Science:

  • Molecular Biology
  • Genetics
  • Bioinformatics

Background:

  • The Janus kinase (JAK)-Signal Transducer and Activator of Transcription (STAT) pathway is crucial for cellular signaling, immune function, and cell growth.
  • Aberrant JAK-STAT signaling, often due to missense mutations, is linked to autoimmune diseases, cancers, and blood disorders.

Purpose of the Study:

  • To analyze missense mutations in JAK and STAT genes, focusing on disease-associated single nucleotide polymorphisms (SNPs) and benign variants.
  • To investigate the distribution, structural localization, and biochemical properties of these mutations.
  • To develop a bioinformatic strategy for refining variant classification in the JAK-STAT pathway.

Main Methods:

  • Analysis of mutations from the All of Us and COSMIC databases.
  • Mapping mutations to functional domains and protein structures.
  • Examination of genomic context, amino acid sequences, and potential CRISPR-Cas9 target sites.

Main Results:

  • Identified mutation hotspots within specific JAK and STAT domains correlating with disease phenotypes.
  • Disease-associated SNPs were found in linker regions and at secondary structure boundaries, impacting protein stability and function.
  • Enrichment of hydrophobic residues (Leu, Ile, Met, Phe) near disease-associated mutations was observed.

Conclusions:

  • Structural and biochemical context are critical for determining the pathogenicity of JAK-STAT pathway mutations.
  • The study provides a bioinformatic approach to better classify variants and understand their role in disease.
  • No significant association was found between CRISPR-Cas9 target sites and disease-associated or benign SNPs.