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The official name of this gene is “pericentrin.”
PCNT is the gene's official symbol. The PCNT gene is also known by other names, listed below.
The PCNT gene provides instructions for making a protein called pericentrin. Within cells, this protein is located in structures called centrosomes. Centrosomes, which are part of chromosomes, play a role in cell division and the assembly of microtubules. Microtubules are fibers that help cells maintain their shape, assist in the process of cell division, and are essential for the transport of materials within cells.
Pericentrin acts as an anchoring protein, securing proteins to the centrosome that are necessary for its function. Through its interactions with these proteins, pericentrin is involved in the regulation of the cell cycle, which is the cell's way of replicating itself in an organized, step-by-step fashion.
At least 30 mutations in the PCNT gene have been found to cause microcephalic osteodysplastic primordial dwarfism type II (MOPDII). These mutations result in the production of an abnormally short, nonfunctional pericentrin protein that cannot anchor other proteins to the centrosome. As a result, centrosomes cannot properly assemble microtubules, leading to disruption of the cell cycle and cell division. Impaired cell division causes a reduction in cell production, while disruption of the cell cycle can lead to cell death. This overall reduction in the number of cells leads to short bones, microcephaly, and the other signs and symptoms of MOPDII.
Gene mutations can be acquired during a person's lifetime and are present only in certain cells. These mutations are called somatic mutations, and they are not inherited. Somatic mutations in the PCNT gene can cause an increase in production of the pericentrin protein. Increased levels of pericentrin have been found in solid tumors (including prostate tumors) as well as cancers of blood-forming cells (leukemia and lymphoma). More pericentrin within the centromere leads to overactivation of the cell cycle and increased cell division. This abnormal cell growth and division can eventually lead to a cancerous tumor.
Certain common genetic variations (polymorphisms) in the PCNT gene have been associated with an increased risk of developing psychiatric disorders such as schizophrenia and depression in some individuals. Similarly, increased levels of pericentrin have been found in some individuals with bipolar disorder. It is unclear how changes in the PCNT gene or increased levels of pericentrin protein are related to these disorders. A large number of genetic and environmental factors, most of which remain unknown, likely determine the risk of developing these complex conditions.
Cytogenetic Location: 21q22.3
Molecular Location on chromosome 21: base pairs 46,324,069 to 46,445,768
The PCNT gene is located on the long (q) arm of chromosome 21 at position 22.3.
More precisely, the PCNT gene is located from base pair 46,324,069 to base pair 46,445,768 on chromosome 21.
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 PCNT 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.
bipolar disorder ; cell ; cell cycle ; cell division ; centromere ; centrosome ; depression ; dwarfism ; gene ; leukemia ; lymphoma ; microcephalic ; microcephaly ; prostate ; protein ; schizophrenia ; tumor
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.