Are ABCC9 rs11046205 CC and BDNF rs6265 AG linked to sleep traits?

At age 53, these variants should not be interpreted as deterministic explanations for habitual sleep duration or recovery from sleep loss. The ABCC9 portion of the claim is not supported, whereas the BDNF finding is a limited physiological signal rather than a clinically actionable predictor.

Habitual sleep duration

• ABCC9 rs11046205 “CC” cannot be directly established from the cited A/G-allele literature, and no evidence demonstrates that this genotype predicts shorter sleep.
• In the initial European GWAS (n=4,251), the minor A allele was associated with longer reported sleep; A/A homozygotes slept approximately 24 minutes longer than common-G homozygotes. This signal did not replicate robustly.
• Larger studies were essentially null: a meta-analysis of 47,180 participants estimated 0.9 minutes longer sleep per minor allele (P=0.11), and UK Biobank estimated 0.1 minutes (95% CI −0.6 to 0.7; P=0.83). These were questionnaire-based sleep measures.
• ABCC9 encodes the SUR2 subunit of ATP-sensitive potassium channels, and experimental work supports a gene-level role in sleep regulation, but does not show that rs11046205 alters human ABCC9 function or sleep physiology.

Sleep-loss recovery physiology

• In a controlled laboratory study of 11 BDNF Val/Met (AG) and 11 matched Val/Val adults, AG carriers had lower absolute NREM slow-wave activity and less stage-4 sleep at baseline and after 40 hours awake, particularly early in sleep.
• These findings provide a plausible biological basis for differences in restorative sleep physiology. However, both groups showed similar relative increases in sleep intensity after deprivation, so this does not establish a genotype-specific impairment in homeostatic rebound or clinical recovery.

Bottom line

• ABCC9 rs11046205 CC is not an established marker of short habitual sleep. BDNF rs6265 AG may be associated with lower absolute slow-wave sleep expression, but it is not a reliable standalone predictor of restorative response, cognitive recovery, or sleep-health risk.