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June 10, 2026

Clinical, Genetic, and Functional Characterization of Novel NFKB1 Variants in Chinese Patients with Primary Immunodeficiency

JZJingyuan ZhangChinese Academy of Medical Sciences & Peking Union Medical College 蔡蔡华聪Chinese Academy of Medical Sciences & Peking Union Medical College TZT Y ZhuChinese Academy of Medical Sciences & Peking Union Medical College

Key Points

This research aims to characterize novel NFKB1 variants in Chinese patients with primary immunodeficiency and evaluate their clinical implications.
Analyzed clinical data and genetic variants from four Chinese patients with NFKB1 variants and previously reported cases.
Conducted in vitro functional assays including immunoblotting, transcript analyses, and co-immunoprecipitation to explore molecular defects.
Compared findings with an international cohort to identify unique characteristics among Chinese patients.
Identified three novel NFKB1 variants with distinct pathomechanisms affecting immune function.
Chinese patients exhibited higher rates of hepatitis (25%) and cirrhosis (12.5%), and pronounced reductions in NK and B cells.
Noted differences in clinical manifestations compared to international cohorts, with less frequent autoimmune diseases.

Abstract

INTRODUCTION: The nuclear factor κB (NF-κB) -related disorders encompassed not only common variable immunodeficiency but also manifestations of autoinflammation, autoimmunity, and malignancies. While most cases have been reported in European populations, reports in the Chinese population are sparse. METHODS: Clinical data and genetic variants from four Chinese patients with NFKB1 variants, alongside four previously reported cases, were analyzed and compared with an international cohort. Additionally, comprehensive in vitro functional assays-including immunoblotting, transcript analyses, dual-luciferase reporter, and co-immunoprecipitation assays-were conducted to explore the molecular defects of the novel variants. RESULTS: Our cohort included three men and one woman, all presenting with recurrent fever and hypogammaglobulinemia. Three patients experienced recurrent sinopulmonary infections, accompanied by decreased B cells and NK cells, while two patients developed pneumonia, bronchiectasis, and hepatitis. Three novel NFKB1 (NM₀03998) variants were identified: c. 559C>T (p. Arg187Trp), c. 1509del (p. Glu504Argfs*19), and c. 1753-11₁760del (p. Thr585Alafs*9). Functional analyses revealed distinct pathomechanisms: the frameshift/splicing variants drive classical haploinsufficiency via nonsense-mediated mRNA decay (NMD), triggering compensatory inflammatory hyperactivation; conversely, the p. Arg187Trp missense variant maintains protein stability and heterodimerization but strictly abolishes DNA-binding capacity. Compared to a previously reported cohort, Chinese patients were predominantly male, had a later median age of onset and diagnosis. Notably, Chinese patients exhibited a higher prevalence of hepatitis (25%) and cirrhosis (12. 5%), potentially reflecting the high endemicity of hepatitis B virus in China. They also showed increased rates of viral infections, sepsis, and bronchiectasis, with more pronounced reductions in NK and B cells. In contrast, autoimmune diseases and bronchitis were less frequent than in the foreign cohort. CONCLUSIONS: This study represents the first and largest case series of Chinese patients with NF-κB1-related diseases, providing molecular characterization for three novel variants. In this limited case series, the observed delayed onset and frequent hepatic complications in our cohort may reflect regional factors, such as HBV endemicity, or ascertainment bias. Our findings underscore that suspected AOSD accompanied by hypogammaglobulinemia warrants immediate genetic investigation. Early diagnosis is essential to prioritize immunoglobulin replacement and prevent fatal complications from immunosuppressive therapy.

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