rs11961853 (UBQLN1P1-MICC): Psoriasis and BMI Genetics

Key takeaways

• This variant was flagged in one of the largest psoriasis genetic studies ever, covering nearly 473,000 people
• The same locus connects to research showing higher childhood BMI may protect against poorer insulin sensitivity in later life
• The ALT allele substantially increases ZFP57 gene activity in whole blood, visceral fat, and thyroid among other tissues
• Common variants at this and related loci together account for roughly 15% of heritable psoriasis risk
• Researchers caution that the childhood BMI findings should not change clinical or public health practice at this stage

What the research says A multi-ancestry genome-wide association meta-analysis (a pooled statistical analysis combining multiple large genetic studies across different ancestry groups) of 28,869 psoriasis cases and 443,950 healthy controls identified 74 genome-wide significant loci (genomic regions statistically linked to a trait at a stringent threshold of p < 5 x 10-8) for psoriasis, including 32 newly discovered ones, with psoriasis-associated genes showing positive genetic correlation with ulcerative colitis, inflammatory bowel diseases, and Crohn's disease. A Mendelian randomisation study (a genetic technique using inherited variants as natural experiments to estimate causal effects) of 441,761 UK Biobank participants found that a genetically estimated 1-standard-deviation higher childhood BMI (roughly 1.97 kg/m2) was associated with a protective effect on insulin sensitivity index (beta coefficient = 0.15; 95% confidence interval 0.067 to 0.225) and reduced fasting glucose (beta = -0.053; 95% CI -0.089 to -0.017), though little independent effect on type 2 diabetes risk was found (OR 0.94, meaning roughly 6% lower odds; 95% CI 0.85 to 1.04).

Reported associations

• Psoriasis susceptibility: Identified among 74 genome-wide significant loci in a multi-ancestry meta-analysis (28,869 cases, 443,950 controls); common variants at psoriasis loci collectively explain approximately 15% of genetic risk for the condition
• Insulin sensitivity (childhood BMI pathway): Genetically modelled higher childhood BMI linked to a protective effect on insulin sensitivity index (beta = 0.15; 95% CI 0.067 to 0.225) in Mendelian randomisation analysis of 441,761 individuals
• Fasting glucose (childhood BMI pathway): Higher genetically modelled childhood BMI associated with reduced fasting glucose (beta = -0.053; 95% CI -0.089 to -0.017)
• Type 2 diabetes: Little to no independent protective effect observed after accounting for genetic liability to adulthood BMI (OR 0.94; 95% CI 0.85 to 1.04)

Evidence quality The psoriasis association comes from a meta-analysis combining UK Biobank, FinnGen, and South Asia Biobank cohorts using MR-MEGA, a method designed for multi-ancestry analyses, with stringent quality control and genome-wide significance thresholds. The childhood BMI and insulin findings come from a Mendelian randomisation analysis of 441,761 European-ancestry UK Biobank participants, validated against the 1958 National Child Development Study (roughly 5,847 participants with BMI measures across multiple childhood ages). The childhood BMI study authors explicitly state the results should not change public health or clinical practice, citing uncertainty about the biological pathway and the inherent limitations of Mendelian randomisation. No direct replication of this specific variant across independent cohorts is described in the available study texts, making the evidence for the BMI-diabetes pathway preliminary.

Tissue-specific expression effects

• ZFP57 (a gene involved in regulating DNA methylation, the process that controls which genes are switched on or off in a cell): The ALT allele is associated with increased expression across at least eight tissues; the strongest signals are in whole blood (p = 1.5 x 10-29) and visceral adipose tissue (abdominal fat, p = 5.4 x 10-20); other tissues showing increased expression include esophagus mucosa, unexposed skin, thyroid, tibial nerve, tibial artery, and sun-exposed lower-leg skin; these are mechanistic findings and their clinical significance is not established GTEx Portal

Lifestyle considerations No lifestyle considerations on file for this variant.