This gene plays an important role in helping tissues attach and shape the body before birth. The FREM1 gene gives instructions for a protein that supports early development, especially around the face, eyes, skull, kidneys, and the opening at the bottom. If the gene does not work properly, a baby may be born with differences such as changes in the nose or eyelids, early joining of skull bones, or problems affecting the kidneys or the bottom opening.
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 building proteins, which are the parts of cells that do much of the work. Others mainly help control when specific processes happen, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can also influence how you respond to food, stress, and medications. More detail on this topic is available in the LearnHub.
Overview
FREM1Gene function
What if the gene works
The FREM1 gene helps build and anchor tissues as a baby develops. Its protein supports the thin layer that holds neighboring tissues together, especially in the face, eyes, and kidneys.
Risk
What if the gene does not work
When the FREM1 gene does not work properly, it can affect facial, eye, anal, kidney, and skull development. Milder variants may cause limited facial or skull changes, while more severe variants can lead to broader birth differences, including metopic craniosynostosis.
Treatment
What does that mean for your treatment
A pathogenic variant in the FREM1 gene does not currently direct a specific medicine or gene targeted treatment. Care is based on the person's features, such as surgery or supportive treatment for craniofacial, anal, eye, or kidney differences. The FREM1 gene is being studied mainly to better understand early development, not as a current treatment target.
Conditions associated with FREM1
Gene function
What if the gene works
FREM1 helps tissues stay connected while the body is taking shape. Its protein sits in the thin support layer beneath cells and helps nearby layers line up correctly. Understanding how the FREM1 gene works helps explain how skin and other developing tissues keep their structure during early growth.
The FREM1 gene helps build a thin support layer beneath cells, where tissues need to stay attached and aligned. This steady connection gives growing tissues a firm base as they fold, stretch, and take shape.
Its protein works outside cells as part of a support network that helps neighboring tissue layers stay connected. This is especially important in places where a smooth, well-lined surface needs to form during early development.
The FREM1 gene supports the close communication between tissue layers that shape the face and other body structures before birth. When this process runs smoothly, cells can move into place in a more organized way.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help shape normal differences between people, such as appearance, metabolism, or the way the body reacts to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. Sometimes, though, a variant can affect how a gene works more significantly and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
Changes in the FREM1 gene can reduce how much FREM1 protein is made, shorten it, or alter its shape so it cannot bind normally to partner proteins outside cells. In plain terms, how FREM1 gene variants affect protein function depends on the change: some milder variants partly weaken stability or interactions, while more severe variants can stop it from working almost completely. This range helps explain why FREM1 related conditions vary, with milder or earlier findings in different people.
How variants are linked to conditions
Pathogenic variants in the FREM1 gene can cause rare conditions present from birth, especially Manitoba oculotrichoanal syndrome and bifid nose with or without anorectal and kidney anomalies. These conditions may affect facial development and, in some people, the eyes, anus, or kidneys. Some FREM1 gene variants have also been linked to metopic craniosynostosis, where the forehead grows in a more triangular shape.
A variant is not necessarily a diagnosis
Variants in genes are a routine part of human biology and are widespread in the general population. Most do not directly affect health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when multiple genes and environmental factors play a role. In some situations, however, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For FREM1, risk is mainly shaped by genetics rather than lifestyle. The chance is higher when a condition linked to FREM1 runs in the family, especially if both biological parents carry a harmful change in the FREM1 gene. There is not enough evidence to say that diet, exercise, or other everyday habits change this risk.
Inheritance of FREM1 variants
The inheritance pattern for FREM1-related conditions can differ depending on the specific condition and variant type. Many well-established FREM1-related syndromes, including MOTA syndrome and BNAR syndrome, are inherited in an autosomal recessive way, so a child inherits one FREM1 gene variant from each parent; when both parents are carriers, each pregnancy has a 25% chance of being affected. Some FREM1-related skull shape findings, including certain cases of trigonocephaly, have also been linked to autosomal dominant inheritance, which means one parent carrying the variant can pass it on with a 50% chance.
What does my FREM1 result mean for my family?
What a FREM1 result means for family members depends on the specific condition linked to that result. Some FREM1-related conditions follow a recessive pattern, so parents may be healthy carriers and brothers or sisters could also be affected or be carriers. Other FREM1-related conditions follow a dominant pattern, which means a parent, child, brother, or sister may also carry the same change.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the FREM1 gene, doctors use genetic testing for FREM1 variants on a blood sample, cheek swab, or saliva sample. A lab reads the gene’s DNA sequence to see whether a variant is present, which can help confirm or clarify a suspected inherited condition.
When should I consider getting a genetic test?
FREM1 testing may be considered when a baby or child has a pattern of rare birth differences that can include changes in the nose or eyelids, an unusual head shape, or problems affecting the anus or kidneys. It can also help when these findings run in the family or when a doctor suspects a FREM1-related condition.
A genetic result is only one part of your health story
Genetic findings can be informative, but how much they reveal varies with the condition and the kind of variant involved. How your body functions over time is also shaped by many other factors, including lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, these results can also help make individual experiences easier to understand.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA can change how the body breaks down a drug, moves it through the body, or responds to it at its target. This helps explain why the same medication may work well for one person but less well for another, or why some people are more sensitive to side effects. These differences are common and are one of several factors, along with age, health, and other medicines, that can shape treatment response.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in genes can shape a person’s response to medication. It examines links between genes and drugs to help explain why the same treatment may work differently from one person to the next. With many medicines, genes affect both how strongly a drug works and how the body processes it. This information can support treatment decisions that are more informed and more individualized. You can read more about this topic in the LearnHub.
Drugs influenced by the FREM1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response, so concerns about side effects, new symptoms, or how well a treatment is working are best discussed with your doctor.
History
FREM1 entered medical genetics through studies of families and children with distinctive facial and developmental features. Initially understood only through visible traits, later recognized as tied to a specific gene, it became linked to conditions such as Manitoba oculotrichoanal syndrome and related craniofacial findings. From these first observations, research expanded steadily, and scientists connected FREM1 variants with a broader range of presentations, including some forms of bifid nose and kidney or anorectal differences. As testing improved, the picture became clearer and showed that changes in the FREM1 gene can lead to quite varied features from one person to another. This work helped place FREM1 among the important genes involved in early human development.