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CDK4, MITF and POT1: what these melanoma genes do | CION Cancer Clinics
CDK4, MITF and POT1 are three genes that help control how cells grow. A fault in any of them can raise the risk of melanoma, a cancer of the skin's pigment cells, and can be passed down a family. All three are rare. This page explains what each gene does, how they differ, and what a fault does and does not mean. 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 do CDK4, MITF and POT1 actually do?
- How is each of the three genes different?
- How does a faulty gene lead to melanoma?
- What do the words on the report mean?
- How do the three genes compare?
- What can this page not tell you?
- What do families get wrong about these genes?
- Common questions about CDK4, MITF and POT1
The short answer
What do CDK4, MITF and POT1 actually do?
All three genes help control how cells grow, and all three have been linked to melanoma, a cancer of the pigment cells in the skin. They are grouped together because each one is a rare cause of melanoma running in a family. Each works in a different way, and each carries a different level of risk.
Why they are tested together
When a family has several cases of melanoma, laboratories usually test a small panel of melanoma genes at once. CDKN2A is the gene most often found. CDK4, MITF and POT1 sit on the same panel because they explain a smaller share of families, and testing them together costs little extra.
How rare these faults are
Faults in any of the three are uncommon everywhere, and far less studied in Indian families. Melanoma itself is less common in darker skin, so most of what is known comes from studies in Europe, Australia and North America. That matters when you read risk figures online.
A fault in one of these genes raises risk. It is not a diagnosis of cancer.One gene at a time
How is each of the three genes different?
They share a panel and a cancer, but they do very different jobs inside the cell.
CDK4
CDK4 is an accelerator for cell division. A healthy cell switches it on only when it needs to divide. A fault can leave it stuck on, so the brake that CDKN2A normally applies no longer works.
What it is linked to
- Melanoma in several relatives
- Many moles, including unusual-looking ones
MITF
MITF is a master switch for pigment cells. It tells them to grow, survive and make pigment. One particular fault in MITF makes those cells a little more likely to become cancerous.
The MITF change raises risk less sharply than a CDK4 or CDKN2A fault.POT1
POT1 protects the tips of chromosomes, called telomeres, which stop the ends of your DNA fraying. A fault lets telomeres grow unusually long, which may let damaged cells keep dividing.
What it may be linked to
- Melanoma
- Some brain tumours and blood cancers
- A rare tumour of blood vessels
What they have in common
All three are passed down in the same way, from either parent. A parent with a fault has a one in two chance of passing it to each child.
Not sure whether this applies to you?
Ask an oncologistFrom gene to melanoma
How does a faulty gene lead to melanoma?
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Pigment cells live in every layer of skin
These cells, called melanocytes, make the pigment that colours your skin and protects it from sunlight. They also form moles.
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The inherited fault is present from birth
Every pigment cell carries it. On its own it does nothing you can see. The cells still follow most of their normal instructions.
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Sunlight and time add further damage
Ultraviolet light and ordinary copying errors damage other genes in single cells over the years. A cell that already had a weak brake is closer to the edge.
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One cell escapes normal control
When enough damage builds up, a single pigment cell may start dividing when it should not. That is how a new or changing mole can turn into a melanoma.
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Which is why early checks help
Melanoma found while it is thin and on the surface is usually simple to remove. That is the reason carriers are offered regular skin checks rather than waiting for symptoms.
On your report
What do the words on the report mean?
- Germline
- Present in every cell from birth, so it can be passed to children. This page is about germline faults only.
- Pathogenic variant
- A spelling change in the gene known to break it. This is what people mean by a gene fault or mutation.
- Variant of uncertain significance
- A spelling change the laboratory cannot yet classify. It should not change your care on its own.
- Melanocyte
- A pigment cell. Melanoma starts in one of these cells.
- Telomere
- The protective cap on the end of each chromosome. POT1 helps keep it the right length.
- Penetrance
- How often a fault actually leads to cancer across everyone who carries it. It is lower for MITF than for CDK4.
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Side by side
How do the three genes compare?
CDK4 and POT1
MITF
Rare faults, found in a small number of melanoma families
One specific change, seen more often but with a milder effect
Risk of melanoma is clearly raised
Risk of melanoma is modestly raised
Relatives are usually offered testing for the exact fault
Testing relatives is discussed case by case
Skin surveillance is usually advised
Skin surveillance is advised on the family history
Being straight with you
What can this page not tell you?
It cannot tell you what your own result means. The same gene can carry many different variants, and each one is classified on its own evidence. What your specific variant means is a question for the counsellor who ordered the test.
The evidence is thin in India
Studies of these genes are small, and very few include Indian families. Risk estimates from abroad may not apply cleanly to a family in Telangana, where melanoma is uncommon and often appears on the palms, soles or nails rather than on sun-exposed skin.
Who this does not apply to
Most people do not need this test. A single melanoma in an older relative, or a family with many ordinary moles and no melanoma, does not usually point to any of these genes. Somatic testing of a melanoma, which looks for faults inside the tumour to guide treatment, is a different test and is covered under targeted therapy.
If you are unsure whether your family history counts, describe it to a genetic counsellor before arranging any test.Commonly believed
What do families get wrong about these genes?
"Melanoma is a sun disease, so genes do not matter."
Sunlight adds damage, but a family fault can load the dice from birth. Both play a part, and the family history is what points to the gene.
"Indian skin cannot get melanoma."
It is less common, not impossible. In Indian patients it often appears on the soles, palms or under a nail, where it is easily mistaken for a bruise or a fungal infection.
"All three genes carry the same risk."
They do not. The MITF change raises risk far less than a CDK4 fault, and the plan that follows is adjusted to the gene and the family.
"If I carry the fault, my children certainly have it."
Each child has an even chance of inheriting it, and an even chance of not. A child who does not inherit it cannot pass it on to their own children.
Questions we are asked
Common questions about CDK4, MITF and POT1
Are CDK4, MITF and POT1 common causes of melanoma?
No. Most melanoma is not inherited at all, and among families where it is, CDKN2A is found far more often. These three genes explain a small extra share of melanoma families, which is why they sit on the same panel rather than being tested alone.
Which parent could the fault have come from?
Either parent. The fault behaves the same way whichever side it came from, and a parent can carry it without ever having had melanoma. Drawing both sides of the family tree is how a counsellor works out which side it is likely to be.
Do these genes cause cancers other than melanoma?
Possibly. MITF has been linked to kidney cancer in some studies, and POT1 to certain brain tumours, blood cancers and a rare tumour of blood vessels. These links rest on small numbers of families, so your counsellor will explain what, if anything, they change for you.
Is this the same as testing my melanoma for treatment?
No. Treatment tests look for faults that grew inside the tumour, such as BRAF, and are not inherited. This page is about a fault present in every cell from birth. The two tests use different samples and answer different questions.
Does a fault mean I will get melanoma?
No. It raises the chance, by different amounts for each gene. Many carriers never develop melanoma, and those who do are often found early because their skin is being checked regularly by a dermatologist.
Can sun protection lower my risk?
It is sensible for everyone and especially for carriers. Shade, covering clothing and avoiding sunburn reduce the extra damage that sunlight adds. It does not remove the inherited part of the risk, which is why skin checks still matter.
My result says uncertain significance. What now?
It means the laboratory found a change and does not yet know whether it matters. It is not a positive result. Your care is planned on the family history, and you should ask how you will be told if the variant is ever reclassified.
Where do I start if melanoma runs in my family?
Write down who had melanoma or other cancers, on both sides, and at roughly what age. Take that list to a genetic counsellor or your oncologist. Call the CION helpline if you are unsure who to approach, 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
- National Cancer Institute — Genetics of Skin Cancer (PDQ) – Health Professional Version
- MedlinePlus Genetics — MITF gene
- MedlinePlus Genetics — CDK4 gene
- Cancer Research UK — Risks and causes of melanoma
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
CDK4, MITF and POT1: which cancers and what riskHow far each gene raises risk, and for which cancersCDK4, MITF or POT1 positive: what happens nextThe first weeks after a positive resultTesting the family for CDK4, MITF and POT1Who should be tested, and in what orderThe CDKN2A geneThe melanoma gene found most often
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