Overlapping gene
![Tandem out-of-phase overlap of the human mitochondrial genes ATP8 (+1 frame, in red) and ATP6 (+3 frame, in blue)[2]](/Images/godic/202501/31/Homo_sapiens-mtDNA~NC_012920-ATP8+ATP6_Overlap.svg3334.png")

An overlapping gene is a gene whose expressible nucleotide sequence partially overlaps with the expressible nucleotide sequence of another gene. In this way, a nucleotide sequence may make a contribution to the function of one or more gene products.