The PIGV gene helps cells make a GPI anchor, a small fatty tag that keeps certain proteins attached to the cell surface. This gene plays an important role in helping those proteins stay in the right place to support normal growth and signaling. If the PIGV gene does not work properly, these proteins may not attach as they should, which can affect the brain and other parts of the body. Pathogenic variants in the PIGV gene can cause Mabry syndrome, a rare condition linked with developmental delay, intellectual disability, seizures, and high alkaline phosphatase levels on blood tests.
What is a gene?
Genes are stretches of DNA that carry instructions cells use to make molecules or to regulate processes in the body. Some genes provide the directions for producing proteins, which are the parts of cells that do the work. Others are used mainly to guide when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, or medicines. For a deeper look at this topic, you can find more in the LearnHub.
Overview
PIGVGene function
What if the gene works
The PIGV gene helps cells build GPI anchors, small molecules that attach certain proteins to the cell surface. This supports cell communication and normal development.
Risk
What if the gene does not work
More disruptive variants in the PIGV gene can cause Mabry syndrome, which often affects learning, development, muscle tone, and can include seizures and high alkaline phosphatase on blood tests. Milder and more severe variants may change timing and severity.
Treatment
What does that mean for your treatment
No PIGV-specific treatment or drug selection approach is currently established. Care is guided by the person’s symptoms rather than by a targeted therapy for the PIGV gene. The PIGV gene is part of the GPI anchor pathway, which is being studied in rare disease research, but this has not yet led to a guideline-based treatment.
Conditions associated with PIGV
Gene function
What if the gene works
Many cells need certain proteins to be fixed to their outer surface so they can do everyday jobs. The PIGV gene helps make the special anchor used for this attachment, called a GPI anchor. When this process runs smoothly, those proteins can reach the cell surface and work where they are needed.
Inside your cells, the PIGV gene helps build a GPI anchor (a small tag made of fats and sugars that tethers certain proteins to the cell surface). One of its main jobs is to carry out a key middle step in that anchor-making process.
The anchor made with help from the PIGV gene allows selected proteins to stay attached to the outside of the cell membrane. This is how proteins get anchored to the cell surface so they can work in the right place.
Many anchored proteins help cells communicate, handle enzymes, and interact with their surroundings. By helping place these proteins on the membrane, the PIGV gene supports steady cell activity in many parts of the body.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or the way the body reacts to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. At times, though, a variant can change how a gene works more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
PIGV gene variants can change the protein’s shape, shorten it, or stop it from being made, which disrupts assembly of the GPI anchor (a small structure that tethers proteins to the cell surface). This explains how PIGV gene variants affect cells at a molecular level. Milder variants may leave some activity, while more severe variants often leave very little or none, which can contribute to earlier or more pronounced features in Mabry syndrome.
How variants are linked to conditions
Pathogenic variants in the PIGV gene cause hyperphosphatasia with impaired intellectual development syndrome, also called Mabry syndrome. This PIGV gene variant condition is linked with developmental delay or intellectual disability, low muscle tone, seizures in some people, and often higher than usual alkaline phosphatase levels on blood tests. Some children also have distinctive facial features and differences in bone, brain, or organ development. A PIGV-related diagnosis usually follows finding harmful variants in both copies of the gene.
A variant is not necessarily a diagnosis
Gene variants are a usual part of human biology and are common across the general population. Most have no direct impact on health and instead represent normal human diversity. For many genes, having a variant associated with a condition suggests a possible link rather than a confirmed diagnosis, especially when several genes and environmental influences are involved. In some situations, though, one well-characterized variant in a particular gene can be enough to confirm the diagnosis.
Are there things that can increase or change my risk?
For PIGV, risk is mainly shaped by inheritance rather than lifestyle. A child is affected when they inherit disease-causing changes in both copies of the PIGV gene; if both parents carry one changed copy, each pregnancy has a 25% chance. There is not broadly confirmed evidence that diet, exercise, or everyday exposures change this risk.
Inheritance of PIGV variants
PIGV-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one PIGV variant from each parent, and both parents are typically healthy carriers. When both parents carry a variant in the PIGV gene, each pregnancy has a 25% chance of resulting in an affected child, a 50% chance of a child who is also a carrier, and a 25% chance of a child with neither variant. For families asking about the PIGV inheritance pattern, PIGV is on an autosome, so this chance is the same for boys and girls.
What does my PIGV result mean for my family?
For families with a disease-causing PIGV result linked to Mabry syndrome, the pattern is usually recessive, so parents are often healthy carriers. Brothers and sisters may also be carriers, and in some families another child could be affected. More distant relatives may also carry the same change, especially on the same side of the family.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the PIGV gene, PIGV genetic testing uses a blood or saliva sample. A lab reads the DNA sequence, often as part of a multigene panel, exome, or genome test, and compares it with the usual sequence to identify variants that may explain an inherited condition.
When should I consider getting a genetic test?
Testing for the PIGV gene may be considered if a child has delayed development, seizures, low muscle tone, and a blood test showing unusually high alkaline phosphatase. It can also be helpful when there is a family history of this rare inherited condition or an affected sibling.
A genetic result is only one part of your health story
A genetic result can be informative, but how much it reveals depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, also shape how the body works over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same treatment works well for one person, works less well for another, or causes more side effects in someone else. Part of the reason is that inherited differences can change how the body breaks down, moves, or responds to a drug, which can influence both benefit and sensitivity.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect the way people respond to medicines. It focuses on links between genes and medications to help explain why the same treatment can work differently in different people. With many drugs, genes influence either how strongly a medicine works or how the body handles it. This information can support treatment choices that are better informed and more tailored to the individual. To explore this subject in more detail, you can find more information in the LearnHub.
Drugs influenced by the PIGV gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or used, so questions about symptoms, treatment, or side effects are best discussed with your doctor.