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Histone proteins serve as structural proteins that enable DNA to wrap around and organise molecularly. IgG antibodies towards histones (anti-histone antibodies; AHAs) are classically found in systemic lupus erythematosus (SLE) and drug-induced lupus, and may be associated with lupus nephritis and other disease manifestations in the former.1 However, AHAs do not specifically diagnostic for these conditions and can appear in a variety of other autoimmune disorders.1
Sjögren’s disease (SjD) is a common chronic autoimmune systemic disease characterised by sicca symptoms, fatigue and B cell hyper-reactivity. AHAs have been identified in SjD patients previously2; however, the prevalence of AHAs and clinical relevance has never been systematically examined. Therefore, we undertook a cross-sectional study of a single-centre cohort of SjD patients in Australia to examine these aspects. Over a 12-month period, the clinical immunology clinics at Westmead Hospital in Sydney, Australia recruited consecutive primary SjD cases that met the ACR/EULAR SjD classification criteria.3 Patients were excluded from analyses if they had an overlap syndrome with SLE (n=12) or other systemic autoimmune diseases as this study …
Footnotes
Handling editor Patrick J Twomey.
Contributors AYSL: concept, data analyses, draft manuscript, guarantor.
Funding This work was supported by a Postgraduate Scholarship from the National Health and Medical Research Council (AL)–Award Number 2013839.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.