Target genes regulated by CLEC16A intronic region associated with common variable immunodeficiency

Area of Science:

• Immunology
• Genetics
• Molecular Biology

Background:

• The CLEC16A intron 19 region is a candidate locus associated with common variable immunodeficiency (CVID).
• Understanding the molecular mechanisms linking CLEC16A variants to CVID pathogenesis is crucial.

Purpose of the Study:

• To elucidate the molecular mechanisms by which variants in the CLEC16A intronic locus contribute to CVID.
• To identify target genes and regulatory pathways influenced by the CLEC16A locus.

Main Methods:

• Fine-mapping of the CLEC16A locus in CVID patients.
• CRISPR-Cas9 deletion of candidate SNPs in T-cell lines followed by RNA-sequencing.
• Chromatin conformation capture and proteomic analysis to identify interactions and transcription factor complexes.
• Multi-omics analysis (RNA-seq, RPPA) to examine regulated pathways.

Main Results:

• The CLEC16A locus acts as an enhancer regulating multiple genes, including ATF7IP2, via long-range chromatin interactions.
• Allele-specific transcription factor complexes mediate these chromatin interactions.
• Disruption of the CLEC16A locus impacts the AKT signaling pathway and CD4+ T cell response to immune stimulation.

Conclusions:

• This study elucidates the target genes and signaling pathways underlying the genetic association between CLEC16A and CVID.
• Identified molecular mechanisms and pathways provide potential targets for novel CVID therapeutics.