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NOTCH2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

NOTCH2 gene

The NOTCH2 gene encodes a receptor protein critical for organ development and bone remodeling, with mutations linked to developmental syndromes and various cancers.

Normal Function

The NOTCH2 gene provides instructions for making a receptor protein that triggers signaling pathways important for growth and development. Before birth, this signaling is vital for the development of the heart, liver, kidneys, teeth, and bones. After birth, it is involved in immune system function, tissue repair, and bone remodeling—the process where old bone is replaced by new bone.

When a ligand binds to the outer portion of the NOTCH2 receptor, the inner portion separates and travels to the cell's nucleus, where it helps regulate the activity of specific genes.

Health Conditions Related to Genetic Changes

Alagille syndrome

Variants in the NOTCH2 gene are an uncommon cause of Alagille syndrome, a condition affecting the liver, heart, and other body parts. These variants typically impair NOTCH2 signaling, disrupting the development of numerous organs and tissues.

Hajdu-Cheney syndrome

This rare disorder is associated with "gain-of-function" variants in the NOTCH2 gene. These mutations prevent the protein from being broken down properly, leading to an accumulation of the receptor and increased signaling. This results in acroosteolysis (loss of bone tissue in fingers and toes), osteoporosis, spinal abnormalities, and distinctive facial features.

Cancers

Somatic NOTCH2 variants have been found in cancers of the blood, liver, stomach, and bladder. These variants often disrupt NOTCH2 signaling, contributing to the uncontrolled growth and division characteristic of cancer cells.

Other disorders

A NOTCH2 gene variant has been identified as a cause of skeletal fragility. This variant disrupts the activation of the NOTCH2 receptor, impairing bone remodeling and resulting in bones that are weaker than usual and prone to fracture.

Frequently Asked Questions

Patients with NOTCH2 mutations often experience brittle bones, frequent fractures, and loss of bone density, especially in the fingers and toes. These changes can lead to pain, difficulty walking or climbing stairs, and a higher risk of fractures from minor falls. Regular bone density scans, calcium and vitamin D supplementation, and weight‑bearing exercises can help maintain bone strength and reduce fracture risk.
Infants may show a persistent jaundice that does not improve with standard treatment, a heart murmur, or a small, irregular liver. Eye abnormalities such as coloboma and facial features like a broad forehead or pointed chin can also be early clues. Prompt referral to a pediatric geneticist and a cardiologist can facilitate early diagnosis and management.
Some clinical trials are exploring NOTCH pathway inhibitors, such as gamma‑secretase inhibitors, for cancers with NOTCH2 alterations. While these therapies are still investigational, they aim to reduce abnormal NOTCH2 signaling that drives tumor growth. Patients should discuss trial eligibility with their oncologist and consider enrolling if appropriate.
Testing is done via a blood or saliva sample analyzed by next‑generation sequencing panels that cover NOTCH2. A pathogenic variant confirms a diagnosis and allows for cascade testing of relatives. For family planning, carriers can consider options such as pre‑implantation genetic testing, prenatal testing, or using donor gametes to avoid passing the mutation to offspring. Genetic counseling is recommended to interpret results and discuss reproductive choices.===
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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