The PIGO gene helps cells attach certain proteins to their outer surface using a small molecular tether called a GPI anchor. If this gene does not work properly, those proteins may not stay in the right place, which can affect brain development and other body systems. Pathogenic variants in the PIGO gene can cause a rare inherited condition linked to developmental delay, seizures, low muscle tone, and often raised alkaline phosphatase on blood tests. PIGO is mainly recognized in medical genetics rather than in popular culture.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or manage processes in the body. Some genes hold the directions for making proteins, the parts of cells that do much of the work. Other genes mainly control when certain processes take place, where they happen, and how strongly they operate. As a group, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. For a deeper look at this topic, you can read more in the LearnHub.
Overview
PIGOGene function
What if the gene works
The PIGO gene helps cells make GPI anchors, small molecules that attach certain proteins to the cell surface. This helps many proteins stay in the right place so cells, especially nerve cells, can work normally.
Risk
What if the gene does not work
Variants in the PIGO gene can cause an inherited condition that affects how some proteins attach to cell surfaces, often leading to developmental delay, intellectual disability, seizures, and high alkaline phosphatase levels. Effects can range from milder to more severe.
Treatment
What does that mean for your treatment
At present, no PIGO-specific treatment or drug selection approach is established for people with a pathogenic variant in the PIGO gene. Care is guided by a person’s symptoms, such as seizure control and supportive therapies, rather than by a proven PIGO-directed medicine.
Conditions associated with PIGO
Gene function
What if the gene works
Some proteins need a small fatty tether to stay on the outside of a cell. The PIGO gene helps finish making this tether, called a GPI anchor (a structure that fastens certain proteins to the cell surface). Understanding how the PIGO gene works helps explain how cells place these proteins where they are needed.
PIGO adds a small chemical piece to a partly built GPI anchor. This finishing step prepares the anchor so selected proteins can be linked to the outer cell membrane.
Once the anchor is ready, it can hold certain proteins at the cell surface. PIGO supports this normal attachment process so those proteins stay in the right location.
Many proteins that use a GPI anchor help with signaling, enzyme activity, and cell to cell interactions. By helping place these proteins on the membrane, PIGO supports these routine surface tasks.
What is a variant?
A genetic variant is a slight change in the DNA sequence of a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. Sometimes, though, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the PIGO gene can disrupt a late step in making GPI anchors, the small surface attachments that hold many proteins on the outside of cells. Some PIGO gene variants that affect GPI anchor biosynthesis mainly lower enzyme activity, while more disruptive variants can leave little or no activity and reduce how many proteins reach the cell surface. This functional range can influence how early PIGO-related features appear and how pronounced they are.
How variants are linked to conditions
Pathogenic variants in both copies of the PIGO gene can cause Mabry syndrome, also called hyperphosphatasia with developmental delay syndrome 2. In practice, PIGO gene variants linked to Mabry syndrome are associated with developmental delay, intellectual disability, seizures, low muscle tone, and high alkaline phosphatase on blood tests. Some people also have distinct facial features or other differences present from birth. Finding pathogenic variants in both copies can confirm the diagnosis.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of being human and are widely found across the general population. Most do not directly affect health and simply contribute to normal human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences play a role. In some situations, though, one specific well-studied variant in a given gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For PIGO, health risk is mainly tied to whether someone inherits harmful changes in both copies of the gene, rather than to lifestyle or everyday exposures. There is not yet broadly confirmed evidence on specific factors that increase or reduce risk related to PIGO, and families with concerns about personal risk may benefit from speaking with a doctor or genetic counselor.
Inheritance of PIGO variants
PIGO-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one altered copy of the PIGO gene from each parent. For families asking about PIGO gene inheritance, when both parents are carriers, each pregnancy has a 25% chance of producing a child with the condition, a 50% chance of producing a carrier child, and a 25% chance of producing a child who did not inherit either altered copy. Parents of an affected child are often healthy carriers themselves.
What does my PIGO result mean for my family?
For families of someone with a disease-causing PIGO result, this condition is usually passed down in a recessive way, so parents are often healthy carriers. Brothers and sisters may also be affected or may be carriers, and other relatives may carry the same change without knowing it. This can matter for family planning and for understanding whether the condition may appear again in the family.
Genetic information
Genetic testing
How you find out about variants
PIGO genetic testing looks for variants in a DNA sample, usually from blood or saliva. A lab reads the PIGO gene through a single gene test, a multigene panel, or exome sequencing to see whether a variant may explain a person’s symptoms. This is how genetic testing for PIGO variants works in routine care.
When should I consider getting a genetic test?
Genetic testing for the PIGO gene may be considered when a child has unexplained developmental delay, seizures, low muscle tone, or an unusually high alkaline phosphatase blood test, especially if there are birth differences or a family history of a similar condition. It can also help clarify risk in a family when a PIGO variant is already known.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals depends on the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is best considered along with 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 perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA can change how the body absorbs, breaks down, transports, or responds to a drug, so the same treatment may work well for one person but less well for another. This is a common part of normal human variation and can influence how much benefit someone gets or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics studies how differences in genes affect the way a person responds to medications. It examines gene and drug patterns to help explain why the same treatment works differently from one person to another. For many medicines, genes influence how strong a drug’s effect is or how the body processes it. This information can support more informed, individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the PIGO gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response, so general questions about medicines, side effects, or other health concerns are best discussed with your doctor or pharmacist.