Figure 5. Metabolic pathways showing the interconversion of PIPs and putative roles of MIP and PI(3,5)P2. Through the specific action of different phosphatases, seven phosphoinosites molecules are generated. Note that a loss of MIP activity will lead to an increase in PI(3,5)P2 concentration and activity. Even small changes in content or activity of phosphatases and/or their substrates can lead to complex pathologies, including several muscle diseases.