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PQBP1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

PQBP1 gene

The PQBP1 gene provides instructions for a protein that helps control gene expression and brain development by regulating RNA.

Normal Function

The PQBP1 gene provides instructions for making a protein called polyglutamine-binding protein 1. This protein attaches (binds) to stretches of multiple copies of a protein building block (amino acid) called glutamine in certain other proteins.

While the specific function of polyglutamine-binding protein 1 is not well understood, it is believed to play a role in processing and transporting RNA, a chemical cousin of DNA that serves as the genetic blueprint for the production of proteins. In nerve cells (neurons), this protein is found in structures called RNA granules, which allow the transport and storage of RNA. Through these mechanisms, polyglutamine-binding protein 1 is thought to help control the way genetic information is used (gene expression) in neurons, which is important for normal brain development.

Health Conditions Related to Genetic Changes

Renpenning syndrome

At least 14 PQBP1 gene mutations have been identified in people with Renpenning syndrome, a disorder that occurs almost exclusively in males and causes intellectual disability and characteristic physical features. Most of the PQBP1 gene mutations that cause Renpenning syndrome result in an abnormally short polyglutamine-binding protein 1. The function of a shortened or otherwise abnormal protein is likely impaired and interferes with normal gene expression in neurons, resulting in abnormal development of the brain.

Anophthalmia/Microphthalmia

MedlinePlus Genetics provides information about Anophthalmia/Microphthalmia.

Coloboma

MedlinePlus Genetics provides information about Coloboma.

Other Names for This Gene

  • 38 kDa nuclear protein containing a WW domain
  • nuclear protein containing WW domain 38 kD
  • polyglutamine tract-binding protein 1
  • polyglutamine-binding protein 1
  • PQBP-1
  • PQBP1_HUMAN
  • RENS1

Genomic Location

The PQBP1 gene is found on the X chromosome.

Frequently Asked Questions

Early intervention programs that include speech therapy, occupational therapy, and specialized educational plans are crucial. Regular monitoring for vision and hearing issues, as well as routine developmental assessments, help tailor interventions to the child's evolving needs.
Research is primarily focused on understanding the molecular mechanisms of PQBP1 dysfunction. While no disease‑specific therapies are currently approved, patients and families can explore clinical trial registries for studies on neurodevelopmental disorders that may include PQBP1 mutation carriers.
Typical features include short stature, microcephaly, a distinctive facial appearance (e.g., a broad nasal bridge, thin upper lip), and sometimes mild skeletal abnormalities. Eye anomalies such as anophthalmia or coloboma may also occur.
Diagnosis involves a detailed clinical assessment followed by targeted genetic testing (e.g., whole-exome sequencing or a focused PQBP1 panel) to identify pathogenic variants. Confirmation may also include functional studies of protein expression.
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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