Three phosphofructokinase isozymes exist in humans: muscle, liver and platelet. These isozymes function as subunits of the mammalian tetramer phosphofructokinase, which catalyzes the phosphorylation of fructose-6-phosphate to fructose-1,6-bisphosphate. Tetramer composition varies depending on tissue type. This gene encodes the muscle-type isozyme. Mutations in this gene have been associated with glycogen storage disease type VII, also known as Tarui disease. Alternatively spliced transcript variants have been described.[provided by RefSeq, Nov 2009]
Forensic Context
A study in humans demonstrated that in skeletal muscle of heavier monozygotic co-twins, the protein PFKM, involved in glycolysis, exhibited higher expression levels compared to their leaner counterparts [van der Kolk et al. DOI:10.1016/j.xcrm.2021.100226].