Intronic variant in MRPL4 on chromosome 19p13.2 that alters transcription factor binding (AREB6 loss, CREB2 gain), reducing mitochondrial ribosomal protein L4 expression and increasing susceptibility to atopy and allergic rhinitis via the HIF-1α signalling pathway

Splicing variant in the IL-7 receptor alpha chain that shifts the balance toward soluble receptor, amplifying IL-7 signaling and raising susceptibility to multiple sclerosis and related autoimmune conditions

Frameshift insertion creating a null CYP2D6 allele; carriers cannot metabolize ~25% of common drugs including opioids, antidepressants, and antipsychotics

Third independent eQTL signal at the CHI3L1/YKL-40 locus on chromosome 1q32.1; the G allele modifies circulating YKL-40 levels independently of the two primary CHI3L1 regulatory variants and has been linked to altered inflammatory and cerebrovascular risk

Intronic variant in GAB2 that modulates late-onset Alzheimer's disease risk; the minor G allele is protective, associated with higher GAB2 expression and reduced tau and amyloid pathology in brain tissue

Deep intronic splice-site variant that is the functional driver of the DPYD HapB3 haplotype; creates a cryptic splice site causing ~50% DPD activity loss and requiring 50% fluoropyrimidine dose reduction

3' untranslated region variant in the IL-4 receptor alpha chain gene; the G allele is associated with elevated type-2 inflammatory endotype in asthma and predicts exacerbation risk and pharmacogenetic response to IL-4 pathway blockade

Connexin 26 missense variant causing partial loss of cochlear gap junction function; the leading cause of mild-to-moderate hereditary hearing loss in East Asian populations

CYP1A2 *1F intronic inducibility variant — defines fast vs slow caffeine metabolizer status and affects clearance of clozapine, theophylline, and tizanidine. The slow-metabolizer C allele blunts the smoking-induced enzyme upregulation that normally accelerates these drugs in heavy smokers.

A 3'UTR variant in IKZF3 that alters miR-326 binding affinity, reducing Aiolos transcription factor expression in a T-allele-dependent manner and increasing susceptibility to systemic autoimmune disease through impaired B-cell maturation and immune homeostasis