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◉ Science·2 min·Updated Mar 12, 2026

What is SNP (Single Nucleotide Polymorphism)?

Single Nucleotide Polymorphism

Quick Answer

A single nucleotide polymorphism (SNP) is a variation in a single nucleotide in the DNA sequence among individuals. These variations can influence how genes function and can be linked to different traits or diseases.

Overview

Single nucleotide polymorphisms, or SNPs, are the most common type of genetic variation among people. They occur when a single nucleotide, which is the basic building block of DNA, is altered in a specific location in the genome. For example, if one person has an 'A' at a particular position in their DNA while another person has a 'G', that difference is a SNP. SNPs can be found in both coding and non-coding regions of genes, meaning they can affect how proteins are made or how genes are regulated. These variations can play a significant role in determining an individual's susceptibility to diseases, response to medications, and other traits. For instance, certain SNPs have been linked to an increased risk of developing conditions like diabetes or heart disease. By studying SNPs, researchers can identify genetic markers that help predict health risks and personalize medical treatments. In the context of genetics and genomics, SNPs are valuable tools for researchers. They help in mapping human genomes and understanding the genetic basis of diseases. SNP analysis is also widely used in fields like pharmacogenomics, where it can guide the choice of medications based on a person's genetic makeup, leading to more effective and safer treatments.

Frequently Asked Questions

SNPs can influence how genes work, which can affect an individual's risk for certain diseases. For example, some SNPs may make a person more susceptible to conditions like cancer or heart disease.
Yes, SNPs are important in personalized medicine as they can help determine how a person will respond to specific drugs. By understanding a patient's SNP profile, doctors can tailor treatments to be more effective.
SNPs can be inherited from parents, so they can be passed down through generations. This means that family members may share certain SNPs, which can influence their health and traits.