The PERCC1 gene helps the stomach and intestines develop the hormone-producing cells that guide digestion and nutrient absorption. If both copies do not work, a baby may develop ongoing watery diarrhea soon after birth, with feeding trouble, poor growth, and low weight gain. This gene plays an important role in early gut development. Pathogenic variants in the PERCC1 gene can confirm a rare inherited congenital diarrheal condition.
What is a gene?
A gene is a piece of DNA that carries instructions your cells use to make molecules or regulate activities in the body. Some genes provide the instructions for producing proteins, which are the functional parts of cells. Others mostly guide when certain processes happen, where they happen, and how active they are. Taken together, genes affect how your body develops and works, and they may influence how you react to food, stress, or medications. To go deeper into this subject, you can learn more in the LearnHub.
Overview
PERCC1Gene function
What if the gene works
The PERCC1 gene helps the stomach and intestines develop normally and supports cells that make hormones that guide digestion.
Risk
What if the gene does not work
More disruptive variants in the PERCC1 gene can cause congenital diarrhea with enteropathy in infancy, leading to poor growth. Variants can range from mild to severe and may influence when symptoms begin and how marked the gut problems are.
Treatment
What does that mean for your treatment
No treatment or management approach specific to pathogenic or loss of function variants in the PERCC1 gene is currently established. Current research mainly uses the PERCC1 gene to better understand rare inherited diarrhea and related gut hormone cell changes, not to guide drug choice yet.
Conditions associated with PERCC1
Gene function
What if the gene works
The PERCC1 gene is active mainly in the digestive tract, where it supports normal gut signaling. Its main role is helping the stomach and upper small intestine build and maintain hormone making cells that guide digestion after meals.
The PERCC1 gene helps certain cells in the stomach and upper small intestine mature into enteroendocrine cells, which are hormone making cells. These cells act like messengers that help the digestive system respond to food.
By supporting these gut signals, the PERCC1 gene helps coordinate everyday digestion, including stomach acid release and related digestive activity after eating. This PERCC1 gene function helps the stomach and small intestine work in step during a meal.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants have no noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can affect how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
PERCC1 gene variants affect protein function by reducing how much PERCC1 protein is made or by creating a shortened, unstable version that breaks down early. Some changes can also disrupt nearby DNA control regions, so the gene is not switched on properly in intestinal cells. Milder variants may leave some residual activity, while more severe variants can lead to little or no working protein. In PERCC1 related intestinal disease, lower remaining function often links with earlier and more persistent symptoms.
How variants are linked to conditions
Pathogenic variants in the PERCC1 gene cause a rare inherited form of congenital diarrhea, sometimes described as congenital enteropathy. Symptoms usually begin in infancy and can include frequent watery stools, poor weight gain, and trouble absorbing nutrients. This PERCC1 gene link to congenital diarrhea in infants is now recognized in human genetics studies, and a confirmed pathogenic variant can establish the diagnosis. Some children need ongoing nutritional support.
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 reflect normal human variation. For many genes, having a variant associated with a condition points to a potential link rather than confirming a diagnosis, particularly when several genes and environmental influences play a role. In other situations, though, one well-characterized variant in a particular gene is enough to establish 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 risk related to PERCC1. For families with a PERCC1-related condition, risk is mainly shaped by the genetic change itself rather than lifestyle or everyday exposures, and a doctor or genetic counselor can explain personal and family risk.
Inheritance of PERCC1 variants
PERCC1-related conditions are inherited in an autosomal recessive pattern. This means a child usually develops the condition only after inheriting two disease-causing variants in the PERCC1 gene, one from each parent. Parents who carry one variant are usually unaffected carriers, and with each pregnancy they have a 25% chance of having an affected child, a 50% chance of having a carrier child, and a 25% chance of having a child with no familial variant. In practical terms, how PERCC1 gene variants are inherited usually involves both sides of the family, even when no one else has symptoms.
What does my PERCC1 result mean for my family?
For families with a disease-causing PERCC1 result, the pattern is recessive, which means close relatives may also carry the same gene change without having symptoms. Brothers and sisters could be affected or be carriers, and parents are usually carriers. Other relatives, such as adult siblings of a parent, may also carry the change and may want to learn their own status if this condition is present in the family.
Genetic information
Genetic testing
How you find out about variants
To find out about changes in the PERCC1 gene, doctors can order genetic testing for PERCC1 variants using a blood sample or saliva. A lab reads the DNA code and checks for variants in this gene. Testing may be done as a single gene test or as part of a broader panel, exome, or genome test.
When should I consider getting a genetic test?
Consider a genetic test for PERCC1 if a baby has severe ongoing diarrhea starting soon after birth, poor growth, and no clear cause on routine testing. It can also be helpful when similar early gut problems have affected brothers, sisters, or other close relatives.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they reveal varies with the condition and the specific type of variant. Over time, many factors, including lifestyle, environment, age, and medical history, also influence how the body functions. For some conditions, particularly those shaped by many genes, genetic information offers context rather than certainty and makes the most sense when considered alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, genetic findings can also help put a person’s experiences in context.
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 breaks down a drug, moves it through the body, or responds to it at its target, so the same treatment may work better for one person than for another. This is common and can influence how much benefit someone gets from a medicine or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect the way they respond to medicines. By studying links between genes and medications, it helps explain why the same treatment can work differently in different people. For many drugs, genes influence either how the body handles a medicine or how much effect that medicine has. This information can support treatment choices that are more informed and more tailored to the individual. More detail on this topic is available in the LearnHub.
Drugs influenced by the PERCC1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine response, so questions about symptoms, side effects, or treatment are best discussed with your doctor.
History
PERCC1 was identified relatively recently through efforts to find the genetic cause of rare inherited digestive conditions seen early in life. Before that, clinicians could describe the pattern of illness, but the underlying gene was not known. As medical science evolved, so did understanding of this gene. Modern DNA sequencing helped connect variants in the PERCC1 gene with a recognizable inherited condition, giving some families a clearer explanation for symptoms that had previously been difficult to classify. This discovery placed the PERCC1 gene into the growing group of genes uncovered through advanced genetic testing rather than through older, trait based observations. Today, its history is mainly part of specialist pediatric and genetics research.