Health condition
COL gene disorders
Variants in the collagen (COL) genes cause a wide family of conditions - from Ehlers-Danlos types and osteogenesis imperfecta to Alport syndrome, Stickler syndrome and early osteoarthritis - and the affected gene predicts the affected tissue.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
Which gene and test confirm it, who should be tested in the family, and which specialist to see.
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Different collagens serve different tissues: COL1 (bone, skin, tendon), COL2/COL11 (cartilage, eye, joint), COL3 (arteries, bowel, uterus), COL4 (kidney, ear, eye), COL5 (skin, joints)
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Examples: COL1A1/2 - osteogenesis imperfecta; COL3A1 - vascular EDS; COL2A1 - Stickler syndrome; COL4A3/4/5 - Alport syndrome
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Inheritance is usually dominant, though patterns vary by gene
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Gene panels can assess many collagen disorders in one test, with surveillance tailored to the gene involved
Understanding the condition
What it is and what happens next.
What causes it, how it is confirmed, and the testing and specialist routes available in the UK.
What it is and how it presents
Collagens are the body's structural fibres, woven to different specifications in different tissues, so a variant announces itself where its collagen matters most: brittle bones and blue sclerae from COL1, detaching retinas and early joint degeneration from COL2, arterial fragility from COL3, blood in the urine and progressive hearing loss from COL4. Families often carry a constellation - relatives with 'early arthritis', another with retinal detachment - without anyone connecting them.
Testing, surveillance and specialist care
When a pattern suggests a collagen disorder, a connective tissue or skeletal dysplasia gene panel is the efficient route to an answer, and the specific gene then writes the surveillance plan: vascular imaging for COL3A1, renal and audiology follow-up for COL4, eye examinations for COL2. Cascade testing with genetic counselling extends that protection through the family. NHS clinical genetics services carry some of the longest waits in the health service, often many months for a first appointment, whereas private genetic testing and a specialist review can typically be arranged within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a clinical geneticist. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any emergency symptoms.
Frequently asked
Common questions about COL gene disorders.
Quick, plain-English answers to what people ask us most.
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What are COL gene disorders?
COL gene disorders are a group of conditions caused by mutations in genes that produce collagen, the main structural protein found in skin, bones, tendons, blood vessels, and many other tissues throughout the body. Because collagen is so widespread in the body, these disorders can affect multiple organ systems, with the specific pattern depending on which COL gene is affected and the type of collagen it normally produces. Examples include certain types of Ehlers-Danlos syndrome, osteogenesis imperfecta, and Alport syndrome.
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What causes COL gene disorders?
They are caused by inherited mutations affecting the structure or production of specific types of collagen, disrupting the normal strength and function of the tissues that rely on that particular collagen type. Different COL genes produce different collagen types found predominantly in specific tissues (such as skin, bone, or the basement membrane of the kidney), which explains why different COL gene disorders affect different combinations of body systems. Inheritance patterns vary depending on the specific gene and condition involved.
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What symptoms do COL gene disorders cause?
Symptoms vary considerably depending on the specific condition and which tissues are most affected, but can include joint hypermobility and skin fragility (in certain Ehlers-Danlos subtypes), bone fragility and frequent fractures (in osteogenesis imperfecta), or progressive kidney and hearing problems (in Alport syndrome). Because collagen is present throughout the body, multiple organ systems can be affected simultaneously in many of these conditions. The specific pattern and severity depend on the exact gene and mutation involved.
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Are COL gene disorders hereditary?
Yes, they are inherited genetic conditions, with specific inheritance patterns (autosomal dominant, autosomal recessive, or X-linked) depending on the particular gene and condition involved. Genetic testing can identify the specific mutation, which helps clarify the inheritance pattern and risk to other family members. Genetic counselling is often recommended to help families understand these implications for future children and other relatives.
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How are COL gene disorders managed?
Management is tailored to the specific condition and affected organ systems, and can include regular monitoring of the specifically affected tissues (such as bone density scans, kidney function tests, or hearing assessments), supportive treatments like physiotherapy or orthopaedic care, and, for some conditions, specific medications. There is no single treatment for COL gene disorders as a group, since management is highly specific to the exact condition diagnosed. A specialist familiar with the specific diagnosed condition typically coordinates this tailored, ongoing care.
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When should I see a specialist?
If you or a family member have features suggestive of a collagen-related disorder, such as unusual joint flexibility with skin fragility, frequent fractures, or a relevant family history, genetic assessment can help clarify the specific diagnosis and guide management. NHS genetics referral can take several weeks to months; a private consultation is typically available within about 2 weeks for earlier specialist assessment.