Hereditary Heterozygous C2 Deficiency: Variable Clinical and Serological Manifestations Among Three Sisters

Title:Hereditary Heterozygous C2 Deficiency: Variable Clinical and Serological Manifestations Among Three Sisters

Volume: 13 Issue: 2

Author(s): Ji Wei Yang, Eric Rich, Claire Saint-Cyr and Josiane Bourré-Tessier*

Affiliation:

• Centre Hospitalier de l’Université de Montréal, Hôpital Notre-Dame, 1560 Sherbrooke Street East, Montréal, QC H2L 4M1,Canada

Keywords: Systemic lupus erythematosus, complement deficiency, autoimmune disorders, antiphospholipid syndrome.

Abstract: The causal link between inherited complement deficiencies and systemic lupus erythematosus (SLE) has been well established, although it remains a rare cause of the disease. We present the case of three biological sisters with hereditary heterozygous C2 deficiency, but who differ widely in their clinical and serological manifestations. Patient 1 is 25 years old and was diagnosed with SLE at the age of 12. Further testing revealed positive ANA and anti-dsDNA, antiphospholipid syndrome (APS) and decreased C2, C3 and C4 levels. Patients 2 and 3 are 21-year-old dizygotic twins. Both have positive ANA and antiphospholipid (APL) antibodies, and decreased C2 and C4 levels. We present a case of familial heterozygous C2 deficiency with different disease phenotypes. The presence of positive APL antibodies in all 3 patients is significant, as this association has been rarely described. The variable clinical and serological manifestations among our patients further reflect the complex and multifactorial nature of SLE.

Cite this article as:

Yang Wei Ji, Rich Eric, Saint-Cyr Claire and Bourré-Tessier Josiane*, Hereditary Heterozygous C2 Deficiency: Variable Clinical and Serological Manifestations Among Three Sisters, Current Rheumatology Reviews 2017; 13 (2) . https://dx.doi.org/10.2174/1573397112666160808093031