The PTPN23 gene helps cells sort and recycle proteins after they have done their job, which supports cell signaling, growth, and brain development. This gene helps your body keep these internal recycling pathways running smoothly. If both copies do not work properly, a person can have a genetic condition that often includes developmental delay, low muscle tone, seizures, and changes seen on brain scans. PTPN23 is mainly discussed in medical genetics rather than public culture.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or regulate activities in the body. Some genes hold the instructions for making proteins, the cell parts that do much of the work. Other genes mainly control when certain processes happen, where they take place, and how strongly they are turned on. Together, genes affect how the body develops and works, and they can shape how you respond to food, stress, or medications. To explore this topic in more detail, you can learn more in the LearnHub.
Overview
PTPN23Gene function
What if the gene works
The PTPN23 gene helps cells sort and recycle proteins after use. This supports cell signaling, growth, and normal tissue development.
Risk
What if the gene does not work
Variants in the PTPN23 gene can cause a neurodevelopmental condition with delayed development, low muscle tone, seizures, and sometimes brain or eye changes. Milder or more severe variants can affect when symptoms appear and how movement and learning are affected.
Treatment
What does that mean for your treatment
No PTPN23-specific treatment or drug selection approach is currently established in clinical guidelines. Care is based on the person’s symptoms and general supportive management rather than a treatment chosen because of a pathogenic variant in the PTPN23 gene.
Conditions associated with PTPN23
Gene function
What if the gene works
In your cells, the PTPN23 gene helps manage how used or activated proteins are moved, sorted, and broken down. This steady cleanup system keeps cell communication organized and supports normal day to day cell function.
The PTPN23 gene helps endosomes, which are small sorting compartments inside cells, direct membrane proteins toward breakdown or further processing. This keeps proteins moving to the right place at the right time.
Its protein helps route activated cell surface receptors toward lysosomes, the cell's recycling centers. This helps signals switch off in a controlled way after a message has been passed.
Working with ESCRT proteins, a cell system that bends and pinches membranes, the PTPN23 gene helps package cargo inside endosomes. This is a key part of what the PTPN23 gene does in cells each day.
What is a variant?
A genetic variant is a minor difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, including differences in appearance, metabolism, and the way the body responds to environmental influences. Many variants do not lead to any noticeable effects and are simply part of natural genetic variation. In some situations, 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
Changes in the PTPN23 gene can alter the protein’s shape, stability, or ability to bind partner proteins, which can disrupt endosome trafficking, a cell process that moves and sorts proteins. Milder variants may leave some residual activity, while more severe loss-of-function variants can result in very little or no working protein. This spectrum shows how PTPN23 gene variants affect protein stability and cellular pathways, with stronger functional loss causing broader disruption inside cells.
How variants are linked to conditions
Pathogenic variants in the PTPN23 gene can cause a rare inherited neurodevelopmental condition with developmental delay and intellectual disability. Some people also have seizures, low muscle tone, movement problems, feeding difficulties, or changes seen on brain scans. This is usually an autosomal recessive condition, meaning the diagnosis is typically confirmed when both copies of the gene carry pathogenic variants.
A variant is not necessarily a diagnosis
Genetic variants are a routine feature of human biology and are found throughout the general population. Most do not directly affect health and instead reflect 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 well-understood variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risks related to the PTPN23 gene. For many living with a PTPN23-related condition, risk is mainly tied to the genetic change itself, and a doctor or genetic counselor can help explain what that may mean for you or your family.
Inheritance of PTPN23 variants
Variants in the PTPN23 gene linked to known inherited conditions are passed down in an autosomal recessive pattern. This means a child usually inherits one nonworking copy from each parent, and the parents are often healthy carriers. When both parents carry a PTPN23 gene variant, each pregnancy has a 25% chance of the child inheriting both variants, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. Because the PTPN23 inheritance pattern is recessive, it affects males and females equally.
What does my PTPN23 result mean for my family?
For families with a disease-causing PTPN23 result, the pattern is usually recessive, which means parents are often healthy carriers. Brothers and sisters may also be carriers, and in some families a sibling could also have the condition. Other close relatives, such as aunts, uncles, and cousins, may carry the same gene change, so the result can matter beyond one person.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the PTPN23 gene, doctors use genetic testing for PTPN23 variants on a blood or saliva sample. A lab reads the gene’s DNA sequence and compares it with the usual sequence to look for changes. Results may identify a disease-causing variant, a harmless variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
Testing for PTPN23 may be considered when a child has unexplained developmental delay, low muscle tone or increasing stiffness, movement problems, seizures, or brain changes seen on scans, especially if similar problems run in the family. Finding a disease-causing change can help explain the condition.
A genetic result is only one part of your health story
A genetic result can be informative, but what it tells you depends on the condition and the kind of variant involved. Over time, many factors shape how the body works, including lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result may offer 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 your body responds to certain medicines. Some people process a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment works well for one person but causes side effects or less benefit in another. These differences are common and are one reason medication response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences shape a person’s response to medications. By looking at links between genes and drugs, it helps explain why the same treatment can work differently from one person to another. For many medicines, genes influence either how strongly a drug works or how the body handles it. This information can support treatment decisions that are both more informed and more individualized. More on this topic is available in the LearnHub.
Drugs influenced by the PTPN23 gene
When should I seek medical advice?
At this time, there is no broadly confirmed evidence that changes in this gene help guide medication choice or predict medication response, so questions about medicines, side effects, or new symptoms are best discussed with your doctor or pharmacist.
History
First described in the scientific literature as part of early genetics, the PTPN23 gene came to attention in the late 1990s and early 2000s during work on cell signaling and tumor related proteins. Researchers also referred to its protein as HD-PTP, a name that appeared often in the early lab studies. Over time, descriptions became more precise as scientists connected findings from cell biology with human genetics. In the 2010s, broader DNA sequencing helped identify PTPN23 variants in people with a recognizable developmental condition, which brought the gene into clearer clinical focus. These historical steps shaped today’s understanding of PTPN23 and its place in medical genetics.