“…The MIB pathway utilizes two enzymes, myo-inositol phosphate synthase (MIPS) and inositol monophosphatase (IMPA), to generate myo-inositol endogenously from glucose-6-phosphate (G-6-P) in a two-step reaction (Geiger and Jin, 2006). The study by Fiol et al (Fiol et al, 2006b) was the first to identify upregulation of MIPS mRNA in response to acute hyperosmotic challenge in tilapia gill, and since then, several studies have confirmed induction of the MIB pathway in other euryhaline species exposed to salinity challenge (Evans and Somero, 2008;Kalujnaia et al, 2009;Kalujnaia et al, 2010;Kalujnaia et al, 2013). In mammals, IMPA has at least two isoforms, originating from different genes (Ohnishi et al, 2007;Shamir et al, 2001), while MIPS can have alternative splice variants (Seelan et al, 2009) derived from the same gene.…”