The FBLN5 gene helps your body build and maintain elastic fibers, which let skin, lungs, blood vessels, and pelvic tissues stretch and spring back. This gene plays an important role in connective tissue strength, so if it does not work properly, these tissues can become weaker and less elastic. People with harmful variants in the FBLN5 gene may develop loose or sagging skin and can also have hernias, lung or blood vessel changes, or pelvic organ prolapse. Some variants have also been linked to age related macular degeneration.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes provide the directions for producing proteins, the working parts of cells. Other genes mainly help decide when certain processes happen, where they take place, and how strongly they run. Together, genes affect how the body develops and functions, and they can also shape how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
FBLN5Gene function
What if the gene works
The FBLN5 gene helps build and organize elastic fibers, which let skin, lungs, and blood vessels stretch and spring back. This supports tissue strength and flexibility throughout the body.
Risk
What if the gene does not work
Variants in the FBLN5 gene can cause cutis laxa, with loose skin and, in some people, lung, blood vessel, or hernia problems. Milder to more severe variants may change when features appear and how strongly they affect the body.
Treatment
What does that mean for your treatment
No FBLN5-specific treatment or drug selection approach is currently established for people with a pathogenic or loss-of-function variant in the FBLN5 gene. The FBLN5 gene is being studied as a biomarker and possible treatment target in age-related macular degeneration and some cancers, but this has not entered routine care.
Conditions associated with FBLN5
Gene function
What if the gene works
The FBLN5 gene helps your body make tissues that can stretch and spring back, such as skin, blood vessels, lungs, and pelvic support tissues. Its protein works outside cells, where it helps arrange elastic fibers in the body’s connective tissue. This is a key part of what the FBLN5 gene does in connective tissue.
The FBLN5 gene helps place elastin, a stretchable tissue protein, into orderly fibers. Its protein links elastin to nearby scaffold parts so these fibers form in the right place.
Well-formed elastic fibers let tissues expand and then return to shape during breathing, movement, and normal changes in blood flow. This spring-back quality is especially important in blood vessel walls, lungs, skin, and pelvic tissues.
FBLN5 protein is part of the extracellular matrix (the material around cells that supports tissues). It helps organize this framework so cells sit in a stable and flexible environment.
What is a variant?
Genetic variants are small changes in a gene’s DNA sequence. They are common and help explain normal differences among people, such as appearance, metabolism, and the way the body responds to environmental influences. Many have no noticeable effect and are simply part of natural genetic variation. In some cases, though, a variant changes how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Changes in the FBLN5 gene show how variants influence the FBLN5 gene's function by changing fibulin-5 folding, stability, or release from the cell, so it cannot join elastic fibers normally. Some variants also weaken its binding to matrix proteins, which disrupts elastic fiber assembly. Milder variants may leave some protein activity, while more severe variants can reduce or block function. In people with FBLN5-related cutis laxa, that difference can influence how early features appear and how widespread they are.
How variants are linked to conditions
Pathogenic variants in the FBLN5 gene are best known for causing some forms of cutis laxa, a condition in which the skin is loose and less elastic. In some people, an FBLN5 gene variant linked to cutis laxa also goes along with early emphysema, hernias, blood vessel changes, or heart valve findings. These are inherited conditions, and a confirmed disease-causing variant can help establish the diagnosis.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely seen in the general population. Most do not have a direct effect on health and instead reflect normal human diversity. In many genes, carrying a variant connected with a condition indicates a possible association rather than a definitive diagnosis, particularly when more than one gene and environmental factors play a role. In other situations, though, one 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 clearly increase or reduce health risk related to the FBLN5 gene itself. The effect on risk depends mostly on the exact gene change and the condition linked to it, and a doctor or genetic counselor can help put that into personal context.
Inheritance of FBLN5 variants
How FBLN5 gene variants are inherited depends on the condition and the specific variant. Well-established FBLN5-related cutis laxa is usually inherited in an autosomal recessive pattern, which means a child inherits one altered copy from each parent, and carrier parents often do not have symptoms. Some FBLN5-related eye findings have also been reported in an autosomal dominant pattern, where one altered copy can be enough and each child of an affected parent has a 50% chance of inheriting it.
What does my FBLN5 result mean for my family?
For inherited skin and connective tissue conditions linked to the FBLN5 gene, the family pattern is usually recessive, which means close relatives may be healthy carriers without knowing it. Brothers, sisters, and future children could share the same change, especially if both parents carry it. In a family with a confirmed FBLN5-related condition, relatives may want to learn whether they also carry the gene change.
Genetic information
Genetic testing
How you find out about variants
To look for variants in the FBLN5 gene, genetic testing uses a blood or saliva sample to read the gene’s DNA sequence. This kind of FBLN5 genetic testing can find a known variant, a new variant, or no relevant change. Results are interpreted alongside your personal and family history.
When should I consider getting a genetic test?
Genetic testing for the FBLN5 gene may be worth considering if someone has very loose, sagging skin from early life, especially with hernias, breathing problems, or blood vessel changes, or if this runs in the family. Testing can help confirm an inherited form of cutis laxa, a condition that affects the body's elastic tissue.
A genetic result is only one part of your health story
Genetic results can provide meaningful insight, but how much they reveal depends on the condition and the kind of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also 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 such as medication response, genetic results can also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same treatment works well for one person, seems weaker for another, or causes more side effects in someone else. Part of the difference comes from how the body absorbs, breaks down, and uses a drug, and these patterns can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines the ways genetic differences can shape a person’s response to medicines. It studies links between genes and medications to better understand why the same treatment may affect people differently. With many drugs, genes influence how strongly a medicine works or how the body handles it. This information can support treatment choices that are more informed and more tailored to the individual. To explore this subject in more detail, you can learn more in the LearnHub.
Drugs influenced by the FBLN5 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how medicines work, so general medication questions, side effects, or treatment concerns are best discussed with your doctor or pharmacist.
History
Researchers identified the FBLN5 gene in the late 1990s while studying proteins that help give tissues their stretch and support. Initially understood only through visible traits, later recognized as tied to a specific gene, FBLN5 drew attention because changes in it were linked to inherited forms of cutis laxa, a condition that affects skin and connective tissue. Building on this early work, scientists also connected the FBLN5 gene to some cases of age related macular degeneration and pelvic organ prolapse. These findings helped place FBLN5 within a broader story of connective tissue research, especially work on how elastic fibers form and hold tissues together. Over time, descriptions became more precise as genetic studies clarified which variants are linked to specific health conditions.