The PRKACA gene gives cells instructions for part of protein kinase A, an enzyme that helps them respond to hormone signals and control growth, energy use, and other everyday functions. This gene plays an important role in how your body turns chemical messages into action. If the PRKACA gene does not work normally, cells may send the wrong signals or grow in an unbalanced way. Certain variants are linked to rare hormone related adrenal tumors and a rare liver cancer.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes give the directions for making proteins, which do much of the work inside cells. Others mainly control when certain processes happen, where they take place, and how strongly they run. Together, genes influence how the body develops and functions, and they can affect how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
PRKACAGene function
What if the gene works
The PRKACA gene helps cells respond to cAMP, a common internal signal. Its protein turns other proteins on or off, supporting hormone signaling, energy use, growth, and normal cell activity.
Risk
What if the gene does not work
Variants in the PRKACA gene can disrupt stress hormone signaling. Some are linked to cortisol excess from adrenal overgrowth or tumors, while others can cause acrodysostosis, affecting bone growth and sometimes hormone responses, with effects ranging from mild to more marked.
Treatment
What does that mean for your treatment
No treatment or medication choice is currently guided by pathogenic variants in the PRKACA gene in routine clinical guidelines. The PRKACA gene is being studied as a drug target and biomarker, especially in adrenal tumors and fibrolamellar liver cancer with the DNAJB1-PRKACA fusion.
Conditions associated with PRKACA
Gene function
What if the gene works
Inside your cells, the PRKACA gene helps turn chemical messages into action. It provides a key working part of protein kinase A, a signaling enzyme used in many tissues. When this pathway is working normally, cells can adjust their activity, energy use, and gene reading in a controlled way. This helps explain what the PRKACA gene does in the body day to day.
The PRKACA gene provides the active part of a signaling enzyme called protein kinase A. This lets cells convert cAMP, a common internal messenger, into clear next-step instructions.
Its protein adds small phosphate tags to other proteins. These tags can change how a protein works, helping cells respond in an organized way.
In routine cell activity, the PRKACA gene helps coordinate how cells use stored fuel and make energy. This supports steady responses when a cell needs to speed up or settle back down.
Some signals passed on by this gene reach the cell nucleus, where genes are read. This helps cells fine tune which proteins they make for everyday growth, upkeep, and adaptation.
What is a variant?
A genetic variant is a small alteration in the DNA sequence of a gene. These changes are common and help create normal differences among people, such as in appearance, metabolism, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some cases, 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 PRKACA gene can alter how strongly its protein kinase signal stays switched on, how well it binds its regulatory partner, or how stable the protein is. In understanding how PRKACA gene variants affect protein activity, some changes mildly shift signaling, while others cause a larger gain or loss of activity. Activating variants often weaken normal control of the protein, whereas more disruptive variants may reduce enzyme function or make the protein less stable. These differences can influence how early and how strongly related features appear.
How variants are linked to conditions
Variants in the PRKACA gene are most clearly linked to adrenal Cushing syndrome. Inherited extra copies of the PRKACA gene can cause both adrenal glands to become overactive and make too much cortisol, while acquired PRKACA variants in cortisol-producing adrenal adenomas can also lead to Cushing syndrome. Separate acquired PRKACA gene fusions are linked to fibrolamellar liver cancer.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are common throughout the general population. Most do not have a direct effect on health and instead reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when multiple genes and environmental factors are involved. In some situations, though, a single well-characterized variant in a particular 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 risk related to PRKACA. In most people, changes involving this gene linked to adrenal hormone problems happen sporadically rather than from clear lifestyle or environmental causes, so personal risk is best discussed with a doctor or genetic counselor.
Inheritance of PRKACA variants
There is not yet a single broadly confirmed PRKACA inheritance pattern that applies across all PRKACA-related findings. Many clinically important changes in the PRKACA gene are found only in adrenal tissue and are not passed from parent to child. The PRKACA gene is located on chromosome 19, which is an autosome, so everyone inherits one copy of this gene from each parent.
What does my PRKACA result mean for my family?
There is not yet a broadly confirmed inherited pattern for PRKACA that applies across the gene as a whole. Many PRKACA findings linked to illness are changes that happen only in the affected tissue rather than changes passed through a family, so what a result means for relatives depends a lot on the exact kind of finding.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the PRKACA gene, doctors can use PRKACA genetic testing on a blood, saliva, or tissue sample. The lab reads the gene’s DNA code and checks for known or unexpected variants, which can help clarify whether a PRKACA related condition is present.
When should I consider getting a genetic test?
PRKACA testing may be considered when someone has signs of too much cortisol, especially if an adrenal growth or enlarged adrenal glands is found or if similar problems run in the family. In that setting, results can help show whether a change in the PRKACA gene is part of the cause.
A genetic result is only one part of your health story
A genetic finding can be informative, yet how much it explains depends on the specific condition and the kind of variant involved. How your body functions over time is also shaped by many factors, including lifestyle, environment, age, and medical history. With some conditions, particularly those affected by many genes, genetic information provides context instead of certainty and makes the most sense when considered with other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, genetic results may help put personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same medication may work well for one person, do less for another, or cause 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, and these differences are common.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes shape a person’s response to medications. It focuses on gene drug patterns to help explain why the same treatment may work differently from one person to another. With many medicines, genes affect either how strong the drug’s effects are or how the body handles it. This information can support more informed, individualized treatment choices. More on this topic is available in the LearnHub.
Drugs influenced by the PRKACA gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose, so questions about side effects, new symptoms, or how well a treatment is working are best discussed with your doctor.
History
Researchers recognized the protein made by the PRKACA gene during the broader discovery of the cAMP signaling pathway, a landmark area of biology in the mid 20th century. From these first observations, research expanded steadily. By the 1980s and 1990s, scientists had identified the PRKACA gene itself and mapped it as part of a family of related genes that helped clarify how cells respond to internal signals. Interest in the PRKACA gene grew further when rare variants were linked to cortisol producing adrenal tumors and Cushing syndrome. Another major step came in 2014, when a DNAJB1-PRKACA fusion was identified as a defining feature of fibrolamellar liver cancer. These findings made the PRKACA gene an important part of both signaling research and modern cancer genetics.