Does ABCC9 rs11046205 affect habitual sleep duration?

Habitual sleep duration is highly polygenic and context-dependent. For ABCC9 rs11046205, an early genome-wide association finding has not held up in larger cohorts, so it has little value for predicting sleep in an individual 53-year-old woman.

Clinical and population evidence

• The original European GWAS (n=4,251) reported genome-wide significance for self-reported sleep duration (P=3.99×10⁻⁸), with an approximately 10-minute per-allele estimate and a roughly 24-minute difference between genotype groups.
• Larger independent studies did not reproduce a meaningful association: CHARGE (n=47,180) estimated +0.9 minutes per minor allele (P=0.11), and a further analysis (n=128,266) estimated +0.1 minutes (95% CI −0.6 to +0.7; P=0.83).
• These near-null replication estimates make rs11046205 an unreliable established correlate of habitual sleep duration and do not support using it to explain clinically short sleep.

Mechanistic context

• rs11046205 is intronic in ABCC9, which encodes SUR2, a regulatory subunit of ATP-sensitive potassium (KATP) channels.
• This pathway has biologic relevance to sleep regulation: neuronal knockdown of the Drosophila ABCC9 homolog shortened nighttime sleep, particularly through delayed sleep onset.
• However, this does not demonstrate that rs11046205 changes ABCC9 expression, SUR2/KATP-channel activity, or sleep physiology in humans.

Interpretation for genetic risk

• A genotype at this locus would not be a deterministic cause of short sleep; the original association described group-average differences, not genotype-specific penetrance or individual prediction.
• Even its role as a susceptibility marker remains uncertain because the original association failed large-scale replication. Allele labels also require caution, since strand/reference coding can make reported genotype designations appear different.

Bottom line

• rs11046205 should not be considered a reliable predictor or cause of short sleep. Its ABCC9/KATP-channel context provides mechanistic plausibility, but current human genetic evidence does not establish a clinically useful susceptibility effect; sleep concerns require clinical assessment rather than interpretation of this variant alone.