Why do some people grab the immediate payoff while others wait for something better?
Researchers at the University of California San Diego set out to explore this question by examining “delay discounting,” a trait linked to impulsive decision-making.
According to UCSD, the team analyzed genome-wide data from more than 130,000 23andMe participants, allowing them to search for genetic patterns connected to this everyday behavior.
The study published in Molecular Psychiatry identified 11 regions of the genome and dozens of candidate genes associated with how people value short-term versus long-term rewards.
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Many of these genes, the researchers reported, are involved in brain development, dopamine signaling and metabolic processes.
Connections reaching far beyond impulsivity
UCSD scientists said the genetic signals tied to delay discounting overlapped with risks for several conditions, including obesity, diabetes, chronic pain, depression and substance-use disorders.
They also examined links to sleep duration, gastrointestinal problems and educational outcomes, suggesting that the trait interacts with a broad set of biological and behavioral systems.
Abraham Palmer and Sandra Sanchez-Roige, senior researchers on the project, noted that these patterns remained even after accounting for intelligence and educational attainment, evidence that delay discounting has its own genetic footprint.
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What comes next?
To explore how these genetic tendencies appear in real-world health settings, UCSD researchers developed polygenic scores that estimate a person’s likelihood of favoring immediate rewards.
When applied to a hospital cohort of more than 66,000 people, these scores were associated with hundreds of medical outcomes, including type 2 diabetes, ischemic heart disease and mood disorders.
The team emphasized that more work is needed to understand cause-and-effect relationships, replicate the findings and clarify how environmental factors, such as socioeconomic status, interact with genetics.
Sources: Medical Xpress, and Molecular Psychiatry.
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