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POGLUT1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

POGLUT1 gene

The POGLUT1 gene provides instructions for making a protein essential for the Notch signaling pathway, which regulates critical developmental processes throughout the body.

Normal Function

The POGLUT1 gene provides instructions for making a protein called protein O-glucosyltransferase 1. This protein is located in the endoplasmic reticulum, a cell structure involved in protein processing and transport. Protein O-glucosyltransferase 1 adds glucose molecules to Notch receptors, a family of proteins involved in a signaling pathway that guides the development of many tissues before birth and throughout life.

The addition of glucose alters the shape of the Notch receptor, allowing it to bind to its ligand and trigger signaling. This pathway regulates several key processes:

  • Cell fate determination: The specialization of cells into specific types.
  • Proliferation: Cell growth and division.
  • Differentiation: Cell maturation.
  • Apoptosis: Programmed cell self-destruction.

In the skin, protein O-glucosyltransferase 1 is found in high levels in the epidermis. It likely plays a role in maintaining precursor cells that mature into melanocytes (pigment-producing cells) and may regulate interactions between melanocytes and keratinocytes.

Health Conditions Related to Genetic Changes

Dowling-Degos disease

At least 11 mutations in the POGLUT1 gene have been found to cause Dowling-Degos disease. This condition is characterized by skin abnormalities, including a lacy pattern of dark skin coloring (hyperpigmentation) that typically appears in body folds and creases.

Most of these mutations lead to a non-functional or partially functional protein. Consequently, the Notch pathway is halted because Notch receptors cannot bind to their ligands. It remains unclear if the symptoms of this condition are due to impaired Notch signaling or the disruption of other unknown functions of protein O-glucosyltransferase 1 in skin cells.

Limb-girdle muscular dystrophy

The POGLUT1 gene is also associated with Limb-girdle muscular dystrophy.

Frequently Asked Questions

Currently, no cure exists, but topical depigmenting agents such as hydroquinone, azelaic acid, or retinoids can help reduce dark spots. Laser therapy (e.g., Q‑switched Nd:YAG) may also be considered under a dermatologist’s guidance. Regular sun protection is essential to prevent worsening of pigmentation.
loss‑of‑function mutation in POGLUT1 stops the enzyme from adding glucose to Notch receptors. Without this sugar modification, Notch receptors cannot properly bind their ligands, disrupting the Notch signaling cascade that normally controls skin cell differentiation and pigment production. The resulting imbalance leads to the characteristic lacy, dark hyperpigmentation in skin folds and creases.
clinical geneticist can order a targeted gene panel that includes POGLUT1, or a whole‑exome sequencing test. The sample is usually a blood draw; the lab will sequence the POGLUT1 coding regions and look for pathogenic variants. Results are typically returned within 4–6 weeks.
Most reported cases involve only skin manifestations. However, because Notch signaling is involved in many tissues, some patients may experience mild hair or nail changes, and rare reports suggest possible ocular or mucosal involvement. If other symptoms arise, a multidisciplinary evaluation is recommended.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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