|http://ghr.nlm.nih.gov/ A service of the U.S. National Library of Medicine®|
The official name of this gene is “presenilin enhancer gamma secretase subunit.”
PSENEN is the gene's official symbol. The PSENEN gene is also known by other names, listed below.
The PSENEN gene provides instructions for making a protein called presenilin enhancer 2 or PEN-2. This protein is one part (subunit) of a complex called gamma- (γ-) secretase. PEN-2 processes another subunit of the complex, presenilin 1, which is produced from the PSEN1 gene. This step is necessary for the γ-secretase complex to be functional.
The γ-secretase complex is located in the membrane that surrounds cells, where it cuts apart (cleaves) many different proteins that span the cell membrane (transmembrane proteins). This cleavage is an important step in several chemical signaling pathways that transmit signals from outside the cell into the nucleus. One of these pathways, known as Notch signaling, is essential for the normal maturation and division of hair follicle cells and other types of skin cells. Notch signaling is also involved in normal immune system function.
At least three mutations in the PSENEN gene have been found to cause hidradenitis suppurativa, a chronic skin disease characterized by recurrent boil-like lumps (nodules) under the skin that develop in hair follicles. The nodules tend to become inflamed and painful, and they produce significant scarring as they heal.
PSENEN gene mutations reduce the amount of functional PEN-2 produced in cells, so less of this protein is available to act as part of the γ-secretase complex. The resulting shortage of normal γ-secretase impairs cell signaling pathways, including Notch signaling. Although little is known about the mechanism, studies suggest that abnormal Notch signaling may promote the development of recurrent nodules in hair follicles and trigger inflammation in the skin.
Cytogenetic Location: 19q13.12
Molecular Location on chromosome 19: base pairs 35,745,577 to 35,747,155
The PSENEN gene is located on the long (q) arm of chromosome 19 at position 13.12.
More precisely, the PSENEN gene is located from base pair 35,745,577 to base pair 35,747,155 on chromosome 19.
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 PSENEN 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.
cell ; cell membrane ; chronic ; enhancer ; gene ; hair follicle ; hematopoietic ; immune system ; inflammation ; nucleus ; progenitor cells ; protein ; subunit ; transmembrane
You may find definitions for these and many other terms in the Genetics Home Reference 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.