Genes
are transcribed into segments of RNA (ribonucleic acid), which are translated
into proteins. Both RNA and proteins are products of the expression of the
gene and, in some cases, can be quantified to determine the activity of the
gene; abnormal amounts of gene product are often associated with the presence
of a disease-causing mutation.
Definition from: GeneTests
from the University of Washington and Children's Health System, Seattle
The biochemical material, either RNA or protein, resulting from expression of a gene. The amount of gene product is used to measure how active a gene is; abnormal amounts can be correlated with disease-causing alleles.