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The official name of this gene is “post-GPI attachment to proteins 2.”
PGAP2 is the gene's official symbol. The PGAP2 gene is also known by other names, listed below.
The PGAP2 gene provides instructions for making a protein that modifies a molecule called a glycosylphosphosphatidylinositol (GPI) anchor. The GPI anchor attaches (binds) to various proteins and then binds them to the outer surface of the cell membrane, ensuring that they are available when needed. The GPI anchor is made up of many different pieces and is assembled in a cell structure called the endoplasmic reticulum, which is involved in protein processing and transport. The anchor is then transferred to a different cell structure called the Golgi apparatus, which modifies newly produced enzymes and other proteins. In the Golgi apparatus, the PGAP2 protein assists in attaching a molecule called a saturated fatty acid to the anchor. This saturated fatty acid is likely needed to help transport and attach the anchor to the fat-rich cell membrane.
At least five PGAP2 gene mutations have been found to cause Mabry syndrome. The features of Mabry syndrome include intellectual disability, distinctive facial features, increased levels of an enzyme called alkaline phosphatase in the blood (hyperphosphatasia), and other signs and symptoms. These mutations change single protein building blocks (amino acids) in the PGAP2 protein and probably reduce the activity of the protein. As a result, the PGAP2 protein cannot efficiently modify the GPI anchor, likely impairing the anchor's ability to attach itself and its associated protein to the cell membrane. GPI anchor-associated proteins that cannot attach to the cell membrane are released from the cell.
An enzyme called alkaline phosphatase is normally attached to the cell membrane by a GPI anchor. However, when the anchor is impaired, alkaline phosphatase is released from the cell. This abnormal release of alkaline phosphatase is responsible for the hyperphosphatasia in Mabry syndrome. It is unclear how PGAP2 gene mutations lead to the other features of Mabry syndrome, but these signs and symptoms are likely due to a lack of proper GPI anchoring of proteins to cell membranes.
Cytogenetic Location: 11p15.5
Molecular Location on chromosome 11: base pairs 3,797,723 to 3,826,370
The PGAP2 gene is located on the short (p) arm of chromosome 11 at position 15.5.
More precisely, the PGAP2 gene is located from base pair 3,797,723 to base pair 3,826,370 on chromosome 11.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
You and your healthcare professional may find the following resources about PGAP2 helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
acids ; cell ; cell membrane ; disability ; endoplasmic reticulum ; enzyme ; gene ; Golgi apparatus ; molecule ; phosphatase ; protein ; receptor ; syndrome
You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://www.ghr.nlm.nih.gov/glossary).
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.