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STAMBP gene

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

STAMBP gene

The STAMBP gene provides instructions for making a protein involved in cellular protein recycling and is associated with a rare syndrome affecting brain and blood vessel development.

Normal Function

The STAMBP gene provides instructions for making a protein called STAM binding protein. Although its exact function is not well understood, within cells this protein interacts with large groups of interrelated proteins known as endosomal sorting complexes required for transport (ESCRTs). ESCRTs help transport proteins from the outer cell membrane to the interior of the cell, a process known as endocytosis. In particular, they are involved in the endocytosis of damaged or unneeded proteins that need to be broken down (degraded) or recycled by the cell. ESCRTs help sort these proteins into structures called multivesicular bodies (MVBs), which deliver them to lysosomes. Lysosomes are compartments within cells that digest and recycle many different types of molecules.

Through its association with ESCRTs, STAM binding protein helps to maintain the proper balance of protein production and breakdown (protein homeostasis) that cells need to function and survive. Studies suggest that the interaction of STAM binding protein with ESCRTs is also involved in multiple chemical signaling pathways within cells, including pathways needed for overall growth and the formation of new blood vessels (angiogenesis).

Health Conditions Related to Genetic Changes

Microcephaly-capillary malformation syndrome

At least 13 mutations in the STAMBP gene have been identified in people with microcephaly-capillary malformation syndrome, an inherited disorder characterized by:

  • Abnormally small head size (microcephaly)
  • Profound developmental delay and intellectual disability
  • Recurrent seizures (epilepsy)
  • Abnormalities of small blood vessels in the skin called capillaries (capillary malformations)

The known STAMBP gene mutations reduce or eliminate the production of STAM binding protein. This shortage allows damaged or unneeded proteins to build up inside cells instead of being degraded or recycled, which may damage cells and cause them to self-destruct (undergo apoptosis). Researchers suspect that abnormal apoptosis of brain cells starting before birth may cause microcephaly and the underlying brain abnormalities found in people with microcephaly-capillary malformation syndrome. A lack of STAM binding protein also alters multiple signaling pathways that are necessary for normal development, which may underlie the capillary malformations and other signs and symptoms of the condition.

Other Names for This Gene

  • AMSH
  • associated molecule with the SH3 domain of STAM
  • endosome-associated ubiquitin isopeptidase
  • STABP_HUMAN
  • STAM-binding protein

Frequently Asked Questions

The STAMBP protein is involved in signaling pathways that regulate angiogenesis, the formation of new blood vessels. Mutations in this gene can lead to abnormal development of capillaries, resulting in the visible skin malformations and potentially affecting blood vessels in the brain. While the primary neurological impact is often related to brain size and structure (microcephaly) and seizures, there is a theoretical risk of vascular fragility. However, the specific risk of spontaneous brain hemorrhage is not as prominently defined as in some other vascular syndromes, but neuroimaging (MRI) is typically used to evaluate the brain structure and rule out other vascular anomalies.
Currently, there is no cure for microcephaly-capillary malformation syndrome caused by STAMBP mutations. Treatment is supportive and focuses on managing symptoms such as seizures, developmental delays, and skin abnormalities. Research is ongoing to better understand the role of the STAMBP protein in cellular recycling and signaling pathways. Future therapeutic strategies may target the underlying molecular mechanisms to improve cellular function, but these are still in the experimental stages. Genetic counseling and participation in clinical trials or registries may provide access to emerging therapies and support for families.
Early signs often appear in infancy and include a noticeably smaller head circumference compared to growth charts (microcephaly), which may become apparent in the first few months of life. Parents should also look for skin findings such as capillary malformations, which are small, red or purple patches on the skin that do not blanch when pressed. Developmental delays, such as difficulty achieving milestones like sitting or crawling, and the onset of seizures are also key indicators. If these signs are present, early referral to a pediatric neurologist and geneticist is crucial for timely diagnosis and intervention.
The prognosis for intellectual disability in microcephaly-capillary malformation syndrome is generally profound, with most individuals experiencing significant cognitive impairment that persists into adulthood. Seizures are a common feature and can be difficult to control, often requiring multiple anti-seizure medications. Early and aggressive management of seizures is important to prevent further brain injury and improve quality of life. Supportive care, including special education, physical therapy, and speech therapy, is essential to help individuals reach their maximum potential and manage daily living skills.
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.