What is an rsID Number?

An rsID is like a genetic "ID number" used to identify specific spots in your DNA where variations can occur. Scientists study these variations, called SNPs (Single Nucleotide Polymorphisms), and assign each one a unique ID number called an rsID (short for "reference SNP cluster ID"). This helps keep track of each SNP across studies and databases.

Let’s take the example of the rsID rs6265, which is a variation in the BDNF gene. About 20% of people have a version of this SNP called the ‘T’ variant, which may be linked to lower production of a protein involved in brain function.

Sometimes, in genetic reports, you’ll see a SNP labeled only by its location, like “Chromosome 11 Position 27658369.” This just tells us the exact address on Chromosome 11, but it’s still referring to the SNP with rsID rs6265. So, the rsID gives each genetic variation a simple, unique label, making it easier to understand and discuss genetic differences.

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