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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Sarcoidosis extent relates to molecular variability.

C S Monast1, K Li2, M A Judson2

  • 1Janssen Research & Development, LLC, Spring House, PA, USA.

Clinical and Experimental Immunology
|February 17, 2017
PubMed
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Sarcoidosis molecular differences vary by organ involvement, impacting treatment effectiveness. Understanding this heterogeneity, including interferon pathway variations, is key to developing targeted therapies for sarcoidosis.

Keywords:
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Area of Science:

  • Immunology
  • Genomics
  • Pharmacology

Background:

  • Sarcoidosis exhibits diverse clinical presentations, but the underlying molecular basis for this heterogeneity remains unclear.
  • Effective treatment strategies for sarcoidosis are hampered by a lack of understanding of its molecular underpinnings.

Purpose of the Study:

  • To investigate the molecular basis of sarcoidosis phenotype heterogeneity.
  • To explore the relationship between molecular differences and treatment response to anti-tumour necrosis factor (TNF)-α (golimumab) and anti-interleukin (IL)-12p40 (ustekinumab) therapies.

Main Methods:

  • Whole blood transcriptome and serum protein levels were analyzed from sarcoidosis patients in a Phase II clinical trial.
  • Differential gene and protein expression analyses were performed to compare sarcoidosis phenotypes based on organ involvement.
  • Gene expression enrichment algorithms identified treatment-associated changes compared to placebo.

Main Results:

  • Significant molecular heterogeneity was observed among sarcoidosis phenotypes, notably in interferon pathway enrichment.
  • Despite phenotypic differences, pathways like T cell receptor signaling showed similar enrichment across phenotypes.
  • Distinct molecular changes were identified between golimumab and ustekinumab treatments, potentially explaining differential clinical efficacy trends.

Conclusions:

  • Molecular heterogeneity in sarcoidosis is linked to the extent of organ involvement.
  • These findings may explain challenges in identifying effective sarcoidosis treatments and suggest new therapeutic strategies.