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OBSL1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

OBSL1 gene

The OBSL1 gene provides instructions for a protein that helps regulate the body's quality control system for proteins and may influence growth hormone responses.

Normal Function

The OBSL1 gene provides instructions for making a protein that is thought to help maintain normal levels of another protein called cullin-7, which is produced from the CUL7 gene. The cullin-7 protein plays a role in the ubiquitin-proteasome system, which is the cell machinery that breaks down (degrades) unwanted proteins.

Cullin-7 helps assemble a complex known as an E3 ubiquitin ligase. This complex tags damaged and excess proteins with molecules called ubiquitin. Ubiquitin serves as a signal to specialized cell structures known as proteasomes, which attach (bind) to the tagged proteins and degrade them. The ubiquitin-proteasome system acts as the cell's quality control system by disposing of damaged, misshapen, and excess proteins. This system also regulates the level of proteins involved in several critical cell activities such as the timing of cell division and growth. In particular, the OBSL1 protein and cullin-7 are thought to help regulate proteins involved in the body's response to growth hormones, although their specific role in this process is unknown.

Health Conditions Related to Genetic Changes

3-M syndrome

At least 29 mutations in the OBSL1 gene have been identified in people with 3-M syndrome, a disorder that causes skeletal abnormalities including short stature (dwarfism) and unusual facial features. Most of these mutations substitute one protein building block (amino acid) for another amino acid in the OBSL1 protein or result in an OBSL1 protein that is abnormally short and nonfunctional.

Mutations in the OBSL1 gene likely lead to reduced cullin-7 protein levels, preventing cullin-7 from bringing together the components of the E3 ubiquitin ligase complex and interfering with the process of tagging unneeded proteins for degradation. The body's response to growth hormones may be impaired as a result. However, the specific relationship between OBSL1 gene mutations and the signs and symptoms of 3-M syndrome are unknown.

Other Names for This Gene

  • KIAA0657
  • obscurin-like protein 1 isoform 1 precursor
  • obscurin-like protein 1 isoform 2 precursor
  • obscurin-like protein 1 isoform 3 precursor

Frequently Asked Questions

Individuals with 3-M syndrome generally have a normal life expectancy and do not typically require specific medical treatments for the syndrome itself. Management focuses on regular monitoring of growth parameters and addressing any associated minor health issues, such as hearing or vision problems, if they arise. Because the condition does not usually impact cognitive development or major organ function, the focus is on supportive care and ensuring the child reaches their maximum genetic potential for height.
3-M syndrome is inherited in an autosomal recessive pattern, meaning both parents must carry one copy of the mutated OBSL1 gene to have a child with the condition. Carrier parents are typically healthy and do not show symptoms. If both parents are carriers, there is a 25 percent chance with each pregnancy that the child will have 3-M syndrome, a 50 percent chance the child will be a carrier like the parents, and a 25 percent chance the child will not have the mutation or be a carrier. Genetic counseling is available to help families understand these risks.
3-M syndrome is characterized by severe pre- and postnatal growth retardation, leading to short stature, but it is distinct because it does not typically involve intellectual disability or major organ malformations. Affected individuals often have a distinctive facial appearance, including a broad forehead, downslanting eyes, and a small mouth. Unlike many other genetic causes of dwarfism, the body proportions in 3-M syndrome are generally normal, and the condition is primarily identified by the specific combination of growth delay and facial features.
Diagnosis is often suspected based on clinical features such as unexplained short stature and characteristic facial traits. However, definitive diagnosis requires genetic testing to identify pathogenic variants in the OBSL1 gene. Since the syndrome is caused by autosomal recessive mutations, testing confirms the specific genetic cause and helps distinguish it from other growth disorders. Early genetic confirmation is important for appropriate growth monitoring and to rule out other conditions that might require different medical interventions.
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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