The PCK1 gene gives instructions for a liver enzyme that helps make glucose, the sugar your body uses for energy, especially between meals and during illness. This gene helps your body keep blood sugar steadier when you have not eaten for a while. If it does not work properly, some people can develop very low blood sugar, acid buildup in the blood, and liver problems, often starting in infancy or childhood.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or regulate processes in the body. Some genes provide the information needed to produce proteins, the parts of cells that do the work. Others mainly help control when certain processes happen, where they happen, and how strongly they run. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, and medications. To go into this topic in more detail, you can learn more in the LearnHub.
Overview
PCK1Gene function
What if the gene works
The PCK1 gene helps the liver and kidneys make glucose when you have not eaten for a while. Its protein is a key part of gluconeogenesis, the process that keeps blood sugar steady between meals.
Risk
What if the gene does not work
Variants in the PCK1 gene can reduce the body’s ability to make glucose during fasting, causing low blood sugar and excess lactic acid in the blood. Effects can range from milder to more severe, with earlier symptoms in some children.
Treatment
What does that mean for your treatment
A pathogenic or loss-of-function variant in the PCK1 gene does not currently point to a gene-specific drug or guideline-based treatment choice. The PCK1 gene is being studied as a metabolic biomarker and possible drug target in diabetes, fatty liver disease, and some cancers.
Conditions associated with PCK1
Gene function
What if the gene works
Between meals, your body still needs a steady supply of glucose, especially for the brain. The PCK1 gene helps make that possible by supporting the liver’s ability to produce glucose from stored building blocks. Understanding how the PCK1 gene helps control blood sugar during fasting also helps explain its central role in everyday energy balance.
When you have not eaten for several hours, the PCK1 gene helps liver and kidney cells make glucose that can enter the bloodstream. This supports a steadier fuel supply for organs that depend on glucose, including the brain.
Its protein carries out a central step in gluconeogenesis (the process of making new glucose). It changes one small molecule into another form your cells can use to build glucose in an organized way.
The PCK1 gene helps your body turn lactate, glycerol, and some amino acids into starting material for glucose production. This is part of normal energy balance between meals and overnight.
What is a variant?
A genetic variant is a slight 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 do not cause any noticeable effect and simply represent natural genetic variation. In some situations, 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 PCK1 gene can change the enzyme’s shape, stability, or activity, so cells make less working protein or a weaker one. This helps explain how PCK1 gene variants affect enzyme activity: some changes leave partial activity, while more disruptive variants can remove most of it. That difference can influence how early symptoms begin and how strongly low blood sugar, lactic acidosis, and liver problems appear.
How variants are linked to conditions
Variants in the PCK1 gene are linked to a rare condition called cytosolic phosphoenolpyruvate carboxykinase deficiency, which can make fasting hard for the body and lead to low blood sugar. When a person inherits pathogenic variants in both copies of the PCK1 gene, they may also develop excess acid in the blood, liver enlargement, and poor growth, often starting in infancy or childhood. Outside this rare diagnosis, the PCK1 gene has not been established as a cause of common diseases.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widespread in the general population. Most do not have a direct effect on health and simply reflect natural human diversity. For many genes, having a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when multiple genes and environmental factors also contribute. In some situations, however, a single well-characterized variant in a specific gene can be 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 risk related to the PCK1 gene. If you have a PCK1 change or a family history of a related condition, a doctor or genetic counselor can help put your personal risk in context.
Inheritance of PCK1 variants
PCK1-related disease is inherited in an autosomal recessive pattern. In practical terms, understanding the PCK1 inheritance pattern means a child usually needs to inherit one altered copy of the PCK1 gene from each parent to be affected. When both parents carry one variant in the PCK1 gene, each pregnancy has a 25% chance of an affected child, a 50% chance of a child who is a carrier, and a 25% chance of a child with two working copies. Parents of an affected child are usually healthy carriers.
What does my PCK1 result mean for my family?
For the rare metabolic condition linked to the PCK1 gene, family members can sometimes carry the same gene change without having symptoms. Brothers and sisters may also be affected or be carriers, and parents are often carriers. If a PCK1 result is confirmed in one family member, close relatives may want to talk with their care team about what that could mean for them and for future children.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for PCK1 variants usually uses a blood or saliva sample. A lab checks the DNA code of the PCK1 gene and compares it with the usual sequence to look for variants. Results may find a pathogenic variant, no relevant variant, or a variant with unclear meaning.
When should I consider getting a genetic test?
Genetic testing for the PCK1 gene may be considered when a baby or child has repeated episodes of very low blood sugar, liver enlargement, poor growth, or high acid levels in the blood that suggest a rare inherited problem with making glucose. It can also help if there is a family history of this condition.
A genetic result is only one part of your health story
A genetic finding can provide useful insight, but how much it reveals depends on the condition and the kind of variant involved. Many factors, including lifestyle, environment, age, and medical history, shape how the body works over time. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can help place individual experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can influence how your body handles some medicines, including how quickly a drug is processed or how strongly it affects you. This helps explain why the same treatment may work well for one person, cause side effects in another, or seem to have less effect in someone else. These differences are common and are one part of why medication response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences shape medication response. It looks at relationships between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes affect how strongly a drug works or how the body processes it. This information can support more informed and individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the PCK1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work or what side effects they may cause. Questions about medicines, side effects, blood sugar, or other health changes are best discussed with your doctor.
History
Research on the PCK1 gene grew out of mid-20th century work on how the liver makes glucose during fasting. Initially understood only through enzyme activity, later recognized as tied to a specific gene, PCK1 became part of the classic story of gluconeogenesis research. Scientists later distinguished the cytosolic form encoded by the PCK1 gene from a related mitochondrial form, which helped clarify how this pathway is organized inside cells. From these first observations, research expanded steadily as investigators showed that hormones such as glucagon, insulin, and cortisol strongly influence PCK1 activity. With the rise of molecular genetics, the PCK1 gene was cloned and its regulation could be studied in much greater detail. Rare inherited PCK1 variants were then identified in people with metabolic disease, linking decades of laboratory research to clinical genetics.