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Genetic Lingo01:11

Genetic Lingo

Overview

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Related Experiment Video

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Blink-induced changes in pupil dynamics are consistent and heritable.

Şükrü Barış Demiral1, Nora D Volkow1

  • 1National Institutes of Health.

Research Square
|August 16, 2024
PubMed
Summary

Blink-induced pupillary responses (BIPR) are heritable, influenced by genetics and environment. These responses, previously considered artifacts, are part of a genetically determined oculomotor system linked to wakefulness.

Keywords:
Blinkdrowsinessheritabilitypupilreliability

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Area of Science:

  • Neuroscience
  • Behavioral Genetics
  • Ophthalmology

Background:

  • Pupil size and blink rates are known heritable traits.
  • The interaction between pupil size changes and blinks, often dismissed as artifacts, remains under-investigated.
  • Heritability of blink-induced pupillary response (BIPR) has not been previously assessed.

Purpose of the Study:

  • To investigate the heritability and interaction of pupil size and blink rates.
  • To characterize the blink-induced pupillary response (BIPR).
  • To determine if BIPR is influenced by genetic factors.

Main Methods:

  • Utilized the HCP 7T fMRI dataset with resting-state eye-tracking data from monozygous and dizygous twins.
  • Characterized pupil dilation (D-peak) and constriction (C-peak) following blinks.
  • Analyzed BIPR patterns across different vigilance states and assessed heritability using structural equation models.

Main Results:

  • BIPR exhibits consistent D-peak (approx. 500ms) and C-peak (approx. 1s) patterns, reproducible within and between subjects.
  • BIPR patterns varied with vigilance state (vigilant vs. drowsy).
  • BIPR demonstrated significant heritability (a² 42-49%), with additive genetic and environmental factors dominating. Blink duration, pupil size, and blink rate were also highly heritable (a² up to 62% for pupil size).

Conclusions:

  • BIPR is a heritable trait with significant genetic and environmental influences.
  • BIPR is associated with wakefulness and should be considered part of a genetically determined Oculomotor Adaptive System (OAS), not merely an artifact.
  • The findings suggest BIPR is a valuable biomarker for studying genetic influences on oculomotor control and vigilance.