presenilin enhancer, gamma-secretase subunit

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.

Genetics Home Reference provides information about Dowling-Degos disease.

Cytogenetic Location: 19q13.12, which is the long (q) arm of chromosome 19 at position 13.12

Molecular Location: base pairs 35,745,651 to 35,747,519 on chromosome 19 (Homo sapiens Updated Annotation Release 109.20200522, GRCh38.p13) (NCBI)

Cytogenetic Location: 19q13.12, which is the long (q) arm of chromosome 19 at position 13.12
  • gamma-secretase subunit PEN-2
  • hematopoietic stem/progenitor cells protein MDS033
  • MDS033
  • MSTP064
  • PEN-2
  • PEN2
  • presenilin enhancer 2 homolog
  • presenilin enhancer gamma secretase subunit
  • presenilin enhancer gamma-secretase subunit