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The PRKAR1A gene: what it does and why it matters | CION Cancer Clinics
PRKAR1A is a gene that keeps a growth switch inside cells turned down until a hormone signal arrives. When one copy is faulty from birth, that switch can stay on, and tumours can form in the heart, skin, hormone glands and testes. Most are not cancer, but some need prompt care. This page explains what the gene does and what a fault means for a family. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- What does the PRKAR1A gene actually do?
- Which parts of the body can a PRKAR1A fault affect?
- How does a faulty switch turn into a tumour?
- The words you will meet, in plain language
- What a PRKAR1A result changes, and what it does not
- What this page cannot tell you
- Four things families tell us about PRKAR1A, and what is true
- Common questions about the PRKAR1A gene
The short answer
What does the PRKAR1A gene actually do?
PRKAR1A carries the instructions for one part of a switch inside cells called protein kinase A. Its job is to hold that switch in the off position until a hormone tells the cell to act. When the gene works, cells in your glands, heart and skin respond to a signal and then settle down again.
What goes wrong when the gene is faulty
A faulty copy makes a holding piece that does not keep the switch off properly. The switch then runs when it should be resting. In certain tissues that steady, unwanted signal pushes cells to grow and, in hormone glands, to release more hormone than the body needs. Over time small tumours can form.
The condition it causes
An inherited PRKAR1A fault is the main known cause of Carney complex, a rare condition that brings together spotty skin pigmentation, benign lumps called myxomas and overactive hormone glands. Most people with Carney complex who are tested turn out to carry a PRKAR1A fault, though not all of them do.
PRKAR1A is a brake gene. A fault takes away some of the braking, not all of it.Where it shows up
Which parts of the body can a PRKAR1A fault affect?
The fault is in every cell, but only a few tissues are sensitive to it. These are the four areas doctors look at.
The heart
Myxomas are soft, jelly-like lumps that can grow inside a heart chamber. They are not cancer, but they can block blood flow or shed fragments that travel to the brain. This is why heart checks matter most.
Why it matters
- Can cause breathlessness or fainting
- Can cause a stroke, even in a young person
- Can grow back after removal
Hormone glands
The adrenal glands can make too much cortisol, which causes a form of Cushing syndrome. The pituitary can make too much growth hormone. Thyroid nodules are common and occasionally turn out to be cancer.
The skin
Small brown or black freckle-like spots, often on the lips, eyelids and inside the mouth, are frequently the first visible sign. Myxomas can also appear as small lumps on the skin, eyelids or ear.
Testes, ovaries and nerves
Men can develop a particular kind of testicular tumour that is usually benign. Rarer tumours of the nerve sheath, called schwannomas, can occur, and some of these do behave like cancer. Ovarian cysts are also reported.
Not sure whether this applies to you?
Ask an oncologistFrom gene to tumour
How does a faulty switch turn into a tumour?
You inherit one faulty copy
Every cell has two copies of PRKAR1A. Someone with Carney complex has one working copy and one faulty one, usually passed down from a parent.
The switch is partly unguarded
With less of the holding protein, protein kinase A becomes more active than it should be. Most cells cope with this and behave normally for years.
A second hit in one tissue
In some cells the working copy is also lost during life. In the adrenal gland, the heart lining or the skin, that cell now has almost no brake left.
Growth or extra hormone follows
The cell divides more than it should, or pours out hormone. The result is a myxoma, a pigmented spot or an overactive gland, depending on where it happened.
On your report
The words you will meet, in plain language
- PRKAR1A
- The gene's short name. It stands for the regulating part of protein kinase A. You do not need to remember the full name.
- Protein kinase A
- A switch inside cells that turns hormone signals into action. PRKAR1A keeps it in check.
- Carney complex
- The condition most PRKAR1A faults cause. It is inherited and rare, and it varies a great deal between members of one family.
- Myxoma
- A soft, benign lump made of jelly-like tissue. In the heart it needs prompt attention. On the skin it is usually harmless.
- Lentigines
- Small flat freckle-like spots. In Carney complex they often cluster around the lips and eyes.
- De novo
- A fault that is new in the person tested, not inherited from either parent. Their own children can still inherit it.
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Side by side
What a PRKAR1A result changes, and what it does not
What it changes
What it does not change
Heart checks start early and repeat regularly
It does not mean a heart myxoma will form
Relatives can be tested for the exact fault
It does not say which features each relative will get
Gland problems are looked for, not waited for
It does not mean you have cancer now
Unexplained symptoms are taken seriously sooner
It does not change care for an unrelated illness
Family planning choices can be discussed
The fault itself cannot be switched off
Being straight with you
What this page cannot tell you
It cannot tell you what your own result means. PRKAR1A faults differ, and two relatives with the same fault can have very different features. What your specific variant means is a question for the counsellor who ordered the test.
The evidence is still limited
Carney complex is rare. Most of what is known comes from a few hundred families followed by specialist centres abroad, so figures on how often each tumour appears are estimates. Studies so far are small, and very few include Indian families.
Who this does not apply to
Most people with freckles, a thyroid nodule or a single benign lump do not have Carney complex and do not need this test. Testing is usually considered when several features appear together, or when a close relative already carries a known fault.
If PRKAR1A has come up on a report in your family, take the report to a genetic counsellor rather than searching for the variant online.Commonly believed
Four things families tell us about PRKAR1A, and what is true
"It is a heart condition, so the heart doctor will manage everything."
The heart is the most urgent part, but the fault also affects hormone glands, skin and testes. Good care usually brings a cardiologist, a hormone specialist and a genetics team together.
"Myxomas are benign, so they can be left alone."
Benign means they do not spread like cancer. A heart myxoma can still block blood flow or cause a stroke, which is why it is usually removed once it is found.
"The spots on the face are just freckles."
Usually they are. In a family with Carney complex, spots on the lips, eyelids or inside the mouth are worth pointing out to the doctor, as they can be an early clue.
"If my parent is well, I cannot have it."
A parent can carry the fault with mild features that were never noticed. In some people the fault is also new, arising for the first time with them rather than being passed down.
Questions we are asked
Common questions about the PRKAR1A gene
Is PRKAR1A a cancer gene?
It is a tumour suppressor gene, which means it normally limits growth. A faulty copy mainly causes benign tumours, but it also raises the chance of some cancers, including certain thyroid cancers and rare nerve sheath tumours. Most carriers have more benign problems than cancerous ones.
Can a PRKAR1A fault be passed to my children?
Yes. Each child of a carrier has a one in two chance of inheriting it, whether the carrier is the mother or the father. Children who do not inherit it cannot pass it on. Your counsellor can explain the options before and during pregnancy.
What is Carney complex?
It is the inherited condition most PRKAR1A faults cause. It combines spotty skin pigmentation, benign lumps called myxomas and overactive hormone glands. Features differ widely, even within one family, and some people have only one or two of them.
Why do doctors worry most about the heart?
Heart myxomas can grow without symptoms, then suddenly block blood flow or send fragments to the brain. Regular heart scans find them early, when removal is simpler. This is the single most important check for anyone carrying the fault.
Should children be tested?
Often yes, because features of Carney complex, including heart myxomas, can appear in childhood. Unlike many adult cancer genes, finding the fault in a child can start useful checks early. Your counsellor will explain what is recommended for your family.
Does the fault affect fertility?
It can. Men may develop testicular tumours that affect sperm, and women can develop ovarian cysts. Not everyone is affected. If you are planning a family, raise it with your doctor early so that fertility can be assessed.
Can lifestyle changes lower the risk?
No lifestyle change removes the fault or its effects. General good health helps, but taking part in regular checks makes the biggest difference, because problems are caught while they are small and simpler to treat.
Where can I get tested in Telangana?
Testing is arranged through a genetic counsellor or clinical geneticist, who orders a blood test for PRKAR1A. Counselling can be done in Telugu. Call the CION helpline and someone will point you to the right clinic.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Sources
- GeneReviews (NCBI Bookshelf) — Carney Complex
- MedlinePlus Genetics — PRKAR1A gene
- MedlinePlus Genetics — Carney complex
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Carney complex explainedThe condition behind most PRKAR1A faults, feature by featurePRKAR1A mutation: which cancers and what riskWhich tumours are linked, and how often they are cancerSurveillance for PRKAR1A carriersThe heart, hormone and skin checks carriers usually haveTesting the family for PRKAR1AWho should be tested, including children, and in what order
Talk to us
Has PRKAR1A come up on a report in your family?
Tell us what the report says and who in the family has had heart, hormone or skin problems. We will help you reach a genetic counsellor who can explain it properly. One helpline serves every CION centre.