What Is Congenital Disorder of Glycosylation, MPI-Related? Congenital disorder of glycosylation (CDG) MPI-related, caused by mutations in the MPI gene, is an inherited metabolic disorder that impairs the production of glycoproteins, which are proteins that have attached carbohydrates. This condition affects many systems of the body, but unlike most CDG disorders, it does not impact the nervous system. Intellect is not impacted in individuals with congenital disorder of glycosylation, MPI-related. If left untreated, congenital disorder of glycosylation, MPI-related can cause a wide array of problems, including chronic diarrhea, failure to grow at the expected rate, loss of protein from the body, severe nausea and vomiting, low blood sugar (hypoglycemia), difficulty in forming blood clots, and liver disease. Because congenital disorder of glycosylation, MPI-related can be life-threatening, early diagnosis and treatment are important. How Common Is Congenital Disorder of Glycosylation, MPI-Related? CDG, MPI-related has been reported in less than 50 individuals, and its prevalence is unknown. How Is Congenital Disorder of Glycosylation, MPI-Related Treated? CDG, MPI-related is treated with oral supplements of mannose, a sugar. Individuals with the disease who begin mannose treatment show improvement in most of the symptoms associated with the condition. Treatment with mannose is lifelong and for some, heparin treatment can improve gastrointestinal issues that cause the body to lose protein. In some cases, liver disease worsens even with treatment, but in one case, symptom improvement was observed after a successful liver transplant. What Is the Prognosis for an Individual with Congenital Disorder of Glycosylation, MPI-Related? With early and regular treatment, an individual with CDG, MPI-related can live a near-normal life. Without treatment, the disease can be fatal. Generally, the prognosis varies depending on the severity of symptoms and the response to mannose treatment. Benefits of congenital disorder of glycosylation, MPI-related Carrier Screening (Genetic Testing) Carrier screening is an important form of genetic testing for those who may be at risk of passing congenital disorder of glycosylation, mpi-related to their baby. Carrier Screening for congenital disorder of glycosylation, mpi-related can help in identifying that risk. The Foresight® Carrier Screen helps clinicians guide care and empowers patients to take action to make the best decision for their families. Learn more about the Foresight® Carrier Screen} by Myriad Genetics. Other names forcongenital disorder of glycosylation, MPI-related Congenital disorder of glycosylation 1b (CDG-1b) Gastrointestinal type CDG MPI deficiency MPI-CDG Mannosephosphate isomerase deficiency SLSJ syndrome Saguenay-Lac Saint-Jean syndrome References Marquardt et al., 2003, Eur J Pediatr, 162(6):359-79, PMID: 12756558 Online Mendelian Inheritance in Man, OMIM [602579], 2017, https://www.omim.org/entry/602579 Sparks et al., 2017, https://www.ncbi.nlm.nih.gov/books/NBK1332/ Vuillaumier-Barrot et al., 2002, J Med Genet, 39(11):849-51, PMID: 12414827