Evaluation of two functional CD24 polymorphisms in primary sclerosing cholangitis

Area of Science:

• Hepatology
• Genetics
• Immunology

Background:

• Primary sclerosing cholangitis (PSC) is a chronic inflammatory bile duct disease with potential genetic links.
• Functional single nucleotide polymorphisms (SNPs) in the CD24 gene are implicated in autoimmune and autoinflammatory conditions, including inflammatory bowel disease (IBD).

Purpose of the Study:

• To investigate the association between two functional CD24 gene SNPs (rs8734 and rs3838646) and the clinical characteristics and disease progression in patients with PSC.

Main Methods:

• Genotyping of a C to T coding polymorphism (rs8734) and a TG deletion in the 3´-untranslated region (rs3838646) in CD24.
• Retrospective chart review of clinical and laboratory data from 359 PSC patients for rs3838646 and 335 PSC patients for rs8734.

Main Results:

• The rs8734 genotype showed a significant association with a decreased risk of dominant strictures at PSC diagnosis (p=0.04).
• The rs3838646 genotype was associated with a reduced risk of developing IBD (p=0.01).
• Neither CD24 SNP significantly influenced overall clinical endpoints or transplantation-free survival in the PSC cohort.

Conclusions:

• The rs8734 CD24 genotype may be associated with fewer dominant strictures at PSC diagnosis.
• The rs3838646 CD24 genotype appears to correlate with a lower incidence of IBD in PSC patients.
• These CD24 SNPs may influence the clinical presentation of PSC but do not seem to be major drivers of disease progression or survival.