Rheumatology International

, Volume 34, Issue 2, pp 191–197

A possible genetic association with chronic fatigue in primary Sjögren’s syndrome: a candidate gene study

  • Katrine Brække Norheim
  • Stephanie Le Hellard
  • Gunnel Nordmark
  • Erna Harboe
  • Lasse Gøransson
  • Johan G. Brun
  • Marie Wahren-Herlenius
  • Roland Jonsson
  • Roald Omdal
Original Article

DOI: 10.1007/s00296-013-2850-9

Cite this article as:
Norheim, K.B., Le Hellard, S., Nordmark, G. et al. Rheumatol Int (2014) 34: 191. doi:10.1007/s00296-013-2850-9

Abstract

Fatigue is prevalent and disabling in primary Sjögren’s syndrome (pSS). Results from studies in chronic fatigue syndrome (CFS) indicate that genetic variation may influence fatigue. The aim of this study was to investigate single nucleotide polymorphism (SNP) variations in pSS patients with high and low fatigue. A panel of 85 SNPs in 12 genes was selected based on previous studies in CFS. A total of 207 pSS patients and 376 healthy controls were genotyped. One-hundred and ninety-three patients and 70 SNPs in 11 genes were available for analysis after quality control. Patients were dichotomized based on fatigue visual analogue scale (VAS) scores, with VAS <50 denominated “low fatigue” (n = 53) and VAS ≥50 denominated “high fatigue” (n = 140). We detected signals of association with pSS for one SNP in SLC25A40 (unadjusted p = 0.007) and two SNPs in PKN1 (both p = 0.03) in our pSS case versus control analysis. The association with SLC25A40 was stronger when only pSS high fatigue patients were analysed versus controls (p = 0.002). One SNP in PKN1 displayed an association in the case-only analysis of pSS high fatigue versus pSS low fatigue (p = 0.005). This candidate gene study in pSS did reveal a trend for associations between genetic variation in candidate genes and fatigue. The results will need to be replicated. More research on genetic associations with fatigue is warranted, and future trials should include larger cohorts and multicentre collaborations with sharing of genetic material to increase the statistical power.

Keywords

Primary Sjögren’s syndrome Genetic association Fatigue 

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Katrine Brække Norheim
    • 1
  • Stephanie Le Hellard
    • 2
    • 3
  • Gunnel Nordmark
    • 4
  • Erna Harboe
    • 1
  • Lasse Gøransson
    • 1
    • 5
  • Johan G. Brun
    • 5
    • 6
  • Marie Wahren-Herlenius
    • 7
  • Roland Jonsson
    • 5
    • 8
  • Roald Omdal
    • 1
    • 5
  1. 1.Clinical Immunology Unit, Department of Internal MedicineStavanger University HospitalStavangerNorway
  2. 2.Department of Clinical Medicine, Dr E. Martens Research Group for Biological PsychiatryUniversity of BergenBergenNorway
  3. 3.Center for Medical Genetics and Molecular MedicineHaukeland University HospitalBergenNorway
  4. 4.Section of Rheumatology¸ Department of Medical SciencesUppsala UniversityUppsalaSweden
  5. 5.Institute of MedicineUniversity of BergenBergenNorway
  6. 6.Department of RheumatologyHaukeland University HospitalBergenNorway
  7. 7.Rheumatology Unit, Department of Medicine, Centre for Molecular MedicineKarolinska InstitutetStockholmSweden
  8. 8.Broegelmann Research Laboratory, The Gade InstituteUniversity of BergenBergenNorway