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In genetics, a biomarker (identified as genetic marker) is a DNA sequence that causes disease or is associated with susceptibility to disease. They can be used to create genetic maps of whatever organism is being studied.ne example of a commonly used biomarker in medicine is prostate-specific antigen (PSA). This marker can be measured as a proxy of prostate size with rapid changes potentially indicating cancer.
A biomarker is a recordable molecular or cellular event. Here we're looking at the individuals as they are, not necessarily when they were born. Humans, in most cases, follow the same biological path. For example, the easiest one that comes to mind is the beginning of puberty and the increase of sex hormones.