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Rare X chromosome abnormalities in systemic lupus erythematosus and Sjögren's syndrome

  • Rohan Sharma
  • , Valerie M Harris
  • , Joshua Cavett
  • , Biji T Kurien
  • , Ke Liu
  • , Kristi A Koelsch
  • , Anum Fayaaz
  • , Kaustubh S Chaudhari
  • , Lida Radfar
  • , Donald U Stone
  • , C Erick Kaufman
  • , Shibo Li
  • , Barbara Segal
  • , Daniel J Wallace
  • , Michael H Weisman
  • , Swamy Venuturupalli
  • , Jennifer A Kelly
  • , Bernardo Pons-Estel
  • , Roland Jonsson
  • , Xianglan Lu
  • Jacques-Eric Gottenberg, Juan-Manuel Anaya, Deborah S Cunninghame-Graham, Andrew J W Huang, Michael T Brennan, Pamela Hughes, Ilias Alevizos, Corinne Miceli-Richard, Edward C Keystone, Vivian P Bykerk, Gideon Hirschfield, Gang Xie, Gunnel Nordmark, Sara Magnusson Bucher, Per Eriksson, Roald Omdal, Nelson L Rhodus, Maureen Rischmueller, Michael Rohrer, Marie Wahren-Herlenius, Torsten Witte, Marta Alarcon-Riquelme, Xavier Mariette, Christopher J Lessard, John B Harley, Wan-Fai Ng, Astrid Rasmussen, Kathy L Sivils, R Hal Scofield, David M Lewis

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)
402 Downloads (Pure)

Abstract

BACKGROUND: Sjögren's syndrome and systemic lupus erythematosus (SLE) are related by clinical and serological manifestations as well as genetic risks. Both diseases are more commonly found in women compared to men at a ratio of about 10 to 1. Common X chromosome aneuploidies, 47,XXY and 47,XXX, are enriched among men and women, respectively, in either disease suggesting a dose effect on the X chromosome.

METHODS: We examined cohorts of Sjögren's syndrome or SLE patients with intensity plots of X chromosome single nucleotide polymorphism (SNP) alleles along with karyotype of selected subjects.

RESULTS: Among ∼2500 women with SLE we found three patients with a triple mosaic consisting of 45,X/46,XX/47,XXX. Among ∼2100 women with Sjögren's syndrome, one patient had 45,X/46,XX/47,XXX with a triplication of the distal p arm of the X chromosome in the 47,XXX cells. Neither the triple mosaic nor the partial triplication were found among controls. In another Sjögren's cohort, we found a mother-daughter pair with partial triplication of this same region of the X chromosome. The triple mosaic occurs in approximately 1 in 25,000 to 50,000 live female births, while partial triplications such are even rarer.

CONCLUSIONS: Very rare X chromosome abnormalities are present among patients with either Sjögren's or SLE, and may inform the location of a gene(s) that mediate an X dose effect as well as critical cell types in which such effect is operative. This article is protected by copyright. All rights reserved.

Original languageEnglish
JournalArthritis & Rheumatology (Hoboken)
Early online date10 Jul 2017
DOIs
Publication statusE-pub ahead of print - 10 Jul 2017

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