Oxoguanine Glycosylase 1 (OGG1)

OGG1 is the primary enzyme responsible for the excision of 7,8-dihydro-8-oxoguanine (8-oxoG), a mutagenic base byproduct which occurs as a result of exposure to reactive oxygen species (ROS). The action of this enzyme includes lyase activity for chain cleavage. Alternative splicing of the C-terminal region of this gene classifies splice variants into two major groups, type 1 and type 2, depending on the last exon of the sequence. Type 1 alternative splice variants end with exon 7 and type 2 end with exon 8. All variants share the N-terminal region in common. Many alternative splice variants for this gene have been described, but the full-length nature for every variant has not been determined. The N-terminus of this gene contains a mitochondrial targeting signal, essential for mitochondrial localization.