Genetic causal inference between amblyopia and perinatal factors

Area of Science:

• Ophthalmology
• Genetics
• Perinatal Medicine

Background:

• Amblyopia is a prevalent global visual disorder with significant impact.
• Non-ocular risk factors for amblyopia are often linked to the intrauterine environment and parental influences.
• Perinatal factors may play a direct causal role in amblyopia development.

Purpose of the Study:

• To investigate the causal association between key perinatal factors and the risk of amblyopia.
• To utilize Mendelian Randomization (MR) to assess genetic causal links between perinatal exposures and amblyopia.

Main Methods:

• Employed a one-sample Mendelian Randomization (MR) design using UK Biobank Cohort Data (UKBB).
• Analyzed associations between birth weight (BW), maternal smoking, and breastfeeding with amblyopia risk.
• Utilized summary statistics from genome-wide association studies in European populations and four distinct MR methods, including inverse variance weighting.

Main Results:

• An inverse causal association was found between birth weight (BW) and amblyopia risk (OR, 0.48; p=0.004).
• Maternal smoking and breastfeeding did not show a significant causal association with amblyopia risk.
• Evidence suggests a genetic causal link between lower BW and increased amblyopia risk.

Conclusions:

• Low birth weight is identified as a potential causal risk factor for amblyopia.
• Findings highlight birth weight as a possible predictive factor for visual maldevelopment.
• Emphasizes the need for careful amblyopia risk management in individuals with low birth weight.