Donnai-Barrow syndrome is a rare genetic condition that affects development of the eyes, ears, brain, and kidneys. People with Donnai-Barrow syndrome often have vision and hearing differences, distinctive facial features, and developmental delay. Signs usually begin in infancy and the condition is lifelong, but not everyone will have the same experience. Treatment for Donnai-Barrow syndrome focuses on supportive care such as vision and hearing aids, therapies, and monitoring of kidneys and growth. Survival varies with severity and early care, and many living with Donnai-Barrow syndrome benefit from coordinated specialist follow-up.
Overview
Donnai-barrow syndromeSymptoms
Early signs of Donnai-Barrow syndrome can appear at birth or before: diaphragm or abdominal wall hernias, distinctive facial features, and feeding or breathing difficulties. As children grow, common features include developmental delay, marked nearsightedness, hearing loss, and kidney protein loss.
Outlook and prognosis
Many living with Donnai-Barrow syndrome can reach adulthood, though support needs vary. Vision and hearing often decline over time, while kidney issues and hernias are monitored and treated early. With coordinated care, education plans, and safety planning, quality of life can be meaningful.
Causes and risk factors
Donnai-Barrow syndrome is caused by changes in a gene called LRP2, usually inherited from both parents (autosomal recessive). Risk is highest when both parents are carriers, especially in closely related parents; environment and lifestyle don’t cause it.
Genetic influences
Genetics is central in Donnai-Barrow syndrome: it’s caused by inherited changes in the LRP2 gene. Most cases are autosomal recessive, so both parents are typically carriers. Genetic testing confirms the diagnosis and helps with family planning and recurrence risks.
Diagnosis
Doctors suspect Donnai-Barrow syndrome from clinical features such as severe nearsightedness, distinctive facial traits, hearing issues, and kidney protein loss. Imaging findings and prenatal ultrasound may support the picture. Genetic tests confirming LRP2 variants establish genetic diagnosis of Donnai-Barrow syndrome.
Treatment and drugs
Treatment for Donnai-Barrow syndrome focuses on each person’s needs. Care often includes hearing support or cochlear implants, vision aids for retinal changes, seizure management, developmental therapies, and kidney monitoring; some may need surgery for diaphragmatic or cranial issues. Coordinated follow-up with genetics, neurology, ophthalmology, ENT/audiology, nephrology, and therapy services helps support daily life and learning.
Symptoms
Families often notice differences at birth or soon after—things like feeding trouble, distinctive facial features, or a belly wall opening that needs quick care. Parents may spot early features of Donnai-Barrow syndrome in the newborn period, and doctors may confirm others with imaging and lab tests. This genetic condition can involve vision and hearing differences, brain structure changes, and kidney findings that together shape learning, movement, and communication. Features vary from person to person and can change over time.
Wide-set eyes, a broad forehead, and a short nose bridge are common. These differences do not affect health by themselves but can help doctors recognize the condition.
Severe nearsightedness and retinal changes can reduce clarity and depth perception. Some have crossed eyes or a risk of retinal detachment. Vision care is a key part of Donnai-Barrow syndrome management.
Inner-ear hearing loss can range from mild to significant. Babies may not startle to loud sounds, and toddlers may have delayed speech.
The bridge that connects the two halves of the brain may be thin or missing. Clinicians call this agenesis of the corpus callosum, which means the usual connector did not fully form. This can affect coordination, attention, and learning.
How people usually first notice Donnai-barrow syndrome?
Families often notice something unusual during pregnancy or soon after birth. The first signs of Donnai-Barrow syndrome can include a very large head size, widely spaced eyes with vision issues, and distinctive facial features; doctors may also pick up low levels of certain proteins in the mother’s blood during prenatal screening or see structural differences on ultrasound. In early infancy, hearing loss, feeding difficulties, or developmental delays may prompt testing and lead to the diagnosis.
Types of Donnai-barrow syndrome
Donnai-Barrow syndrome is a rare genetic condition with features that can affect hearing, vision, the kidneys, and development. Symptoms don’t always look the same for everyone. Clinicians often describe them in these categories: how early and strongly the eyes and ears are affected, whether the kidneys leak protein, and whether there are structural differences in the skull or abdomen. There are no widely accepted distinct genetic subtypes, so when people discuss types of Donnai-Barrow syndrome, they usually mean patterns of severity rather than separate variants.
No distinct variants
No distinct types of Donnai-Barrow syndrome are widely recognized. Differences seen in families usually reflect how strongly the same underlying gene change shows up in each person.
Eye‑dominant pattern
Vision problems such as severe nearsightedness and retinal changes stand out early. Hearing loss, kidney issues, or developmental delays may be milder in comparison.
Ear‑dominant pattern
Hearing loss is more noticeable early on, sometimes picked up at newborn screening. Vision changes can be present but less prominent at first.
Kidney‑focused pattern
Protein loss in urine and low blood protein levels lead to swelling or fatigue. Eye and ear findings still occur but may be overshadowed by kidney monitoring needs.
Cranio‑abdominal features
A broad forehead, widely spaced eyes, or a gap in the diaphragm or abdominal wall may be key early clues. Other features like hearing or kidney findings may emerge over time.
Broader developmental pattern
Developmental delays or learning differences drive daily challenges, like language or motor skills. Medical features are present but may feel secondary to therapy and school supports.
What genetics can tell you about symptoms
In Donnai-Barrow syndrome, changes in the LRP2 gene disrupt megalin, a “cargo-receptor” that helps cells absorb key nutrients and vitamins. This leads to a pattern of symptoms: severe nearsightedness, sensorineural hearing loss, enlarged fontanelle, protein loss in urine, and developmental delays.
Causes and risk factors
Donnai-Barrow syndrome is caused by changes in both copies of the LRP2 gene.
Some risks are written in our DNA, passed down through families.
Most children inherit one changed copy from each parent, who are healthy carriers.
Parents who are related by blood have a higher chance of carrying the same LRP2 change.
Lifestyle or environment do not cause it, but they can influence care needs and the timing of early symptoms of Donnai-Barrow syndrome.
Environmental and biological risk factors
Donnai-barrow syndrome is present from birth, and the main drivers of risk come from within early development rather than outside exposures. Doctors often group risks into internal (biological) and external (environmental). While early symptoms of Donnai-barrow syndrome may be noticed right after delivery, most common environmental exposures studied so far have not been tied to whether the condition occurs.
Common environmental exposures such as air pollution, heavy metals, or radiation have not been shown to increase the likelihood of Donnai-barrow syndrome. Evidence to date does not support a direct environmental cause.
Infections during pregnancy, including viral or bacterial illnesses, are not known to trigger this condition. Managing infections remains important for overall pregnancy health.
Chronic conditions like diabetes, hypertension, or thyroid disease have not been linked to a higher chance of this syndrome. They can affect pregnancy broadly but are not associated with its occurrence.
Advanced maternal or paternal age has not been clearly associated with a higher risk of Donnai-barrow syndrome. Unlike some chromosomal conditions, an age effect has not been observed.
Genetic risk factors
Donnai-Barrow syndrome happens when both copies of a single gene, LRP2, have harmful changes. It follows an autosomal recessive pattern, so most affected children inherit one non-working copy from each parent, who are healthy carriers. Some risk factors are inherited through our genes. Severity can vary from family to family, which is why learning the exact family variant can help clarify personal and sibling risks.
LRP2 gene changes: Changes in both copies of the LRP2 gene cause this condition. These changes prevent the gene’s protein from working properly. That disrupts development of the eyes, ears, brain, and kidneys.
Autosomal recessive pattern: A child is affected when both gene copies have harmful changes. When both parents are carriers, each pregnancy has a 25% (1 in 4) chance for Donnai-Barrow syndrome. Carriers typically have no symptoms.
Carrier parents: Parents of an affected child are usually healthy carriers of one LRP2 change each. Their chance of having another affected child remains 25% per pregnancy. Unaffected children have a 2 in 3 chance to be carriers.
Consanguinity risk: When parents are related by blood, they are more likely to share the same rare LRP2 change. This raises the chance of the condition in a child. Many families without related parents can also have an affected child.
Sibling and child risk: Full siblings of an affected child each have a 25% chance to also be affected. People with the condition will pass one non-working LRP2 copy to all children. A child is affected only if the other parent is also a carrier.
Variant types: Different kinds of gene changes can inactivate LRP2, including small changes or missing pieces. Having two such changes—either the same or two different ones—can lead to the condition. Labs classify which changes are clearly disease-causing.
Family variant testing: Once a family’s LRP2 change is known, relatives can have targeted testing to learn if they carry it. This helps clarify personal risk and guides planning for future pregnancies. Early symptoms of Donnai-Barrow syndrome can be anticipated when results are available.
Variable expression: Features can differ in type and severity, even among relatives with the same LRP2 changes. Some may notice more impact on hearing or vision than others. This helps explain why two people with the condition can look quite different.
Lifestyle risk factors
Donnai-Barrow syndrome is a genetic condition; lifestyle habits do not cause it, but daily choices can influence symptoms, comfort, and complications. Below are examples of how lifestyle affects Donnai-barrow syndrome in practical ways. These suggestions should complement, not replace, your clinical care plan.
Regular, therapist-guided exercise can improve hypotonia, balance, and joint stability in Donnai-Barrow syndrome. Better strength and coordination may reduce falls and support developmental progress.
Avoiding high-impact or contact sports lowers risk of eye trauma that could threaten vision in people with extreme myopia. Choosing low-impact activities (like swimming with supervision) limits abdominal strain if there is hernia risk.
Using sports goggles and avoiding activities with head blows can reduce chances of retinal injury in severe myopia. Consistent visual breaks and good lighting may ease eye strain during reading or schoolwork.
Keeping personal audio volumes low and limiting prolonged headphone use helps protect hearing in those already at risk of loss. Prompt care for ear discomfort and consistent use of hearing devices improves communication and learning.
Risk prevention
Donnai-Barrow syndrome is a rare genetic condition present from birth, so you can’t prevent it outright. Prevention focuses on reducing complications, spotting problems early, and planning care ahead of time. Prevention works best when combined with regular check-ups. Families can also consider reproductive options to lower the chance in future pregnancies.
A genetics professional can explain inheritance and recurrence risk. This helps families decide on carrier testing and plan future pregnancies.
If a family variant is known, testing relatives can identify carriers. Knowing carrier status guides planning and informs risks for future children.
When family variants are known, chorionic villus sampling or amniocentesis can test a pregnancy. Detailed ultrasounds and, if needed, fetal MRI can look for features linked to Donnai-Barrow syndrome.
IVF with embryo testing can select embryos without the familial variants. This option reduces the chance of having a child with Donnai-Barrow syndrome.
Transmission
Donnai-Barrow syndrome is a genetic condition and isn’t contagious—you can’t catch it from someone else. It’s usually inherited in an autosomal recessive way, meaning both parents are healthy carriers of one nonworking copy of the gene. When two carriers have a child, each pregnancy has a 25% (1 in 4) chance the child will have Donnai-Barrow syndrome, a 50% chance the child will be a carrier, and a 25% chance the child will inherit neither change. Someone living with Donnai-Barrow syndrome will pass one nonworking copy to all their children; a child will have the condition only if the other parent is also a carrier or affected. If you have questions about how Donnai-Barrow syndrome is inherited, a genetics professional can discuss carrier testing and family planning options.
When to test your genes
Genetic/congenital condition
Genetic testing is appropriate when a baby shows hallmark features of Donnai‑Barrow syndrome—such as diaphragmatic hernia, distinctive facial features, eye or hearing differences—or when there’s a known LRP2 variant in the family. Test during pregnancy if ultrasound suggests these findings. Results guide care, early therapies, and family planning.
Diagnosis
For families, the first clues often come from things noticed early in life, like vision or hearing differences, distinctive facial features, or concerns seen on pregnancy scans. Early and accurate diagnosis can help you plan ahead with confidence. The genetic diagnosis of Donnai-Barrow syndrome is usually based on recognizable clinical features that are then confirmed with specific tests. Doctors typically combine exam findings, imaging, and genetic testing to make the diagnosis and guide care.
Providers look for a pattern that can include wide-set eyes, high myopia, hearing differences, and developmental delays. Some have abdominal wall or diaphragm differences noticed at birth.
An eye doctor checks for severe nearsightedness, retinal problems, and other structural changes. These findings help support Donnai-Barrow syndrome when seen with other features.
Newborn hearing screens or formal audiology tests can show sensorineural hearing loss. Documenting the type and degree of hearing loss adds to the overall diagnostic picture.
MRI can show differences in brain structure, such as underdevelopment or absence of the corpus callosum. These imaging findings, while not unique to this condition, are helpful when combined with other signs.
Stages of Donnai-barrow syndrome
Donnai-Barrow syndrome does not have defined progression stages. It is a rare genetic condition present from birth, and features can vary widely—such as vision and hearing differences, kidney changes seen on lab tests, or structural differences in the brain or diaphragm—so care focuses on each person’s needs rather than a step-by-step decline. Early symptoms of Donnai-Barrow syndrome are often noticed in infancy or early childhood, and diagnosis usually combines a physical exam, hearing and eye checks, urine testing for protein loss, imaging when needed, and genetic testing to confirm the cause. Different tests may be suggested to help clarify what’s going on and guide follow-up with the right specialists.
Outlook and prognosis
Looking at the long-term picture can be helpful. Donnai-Barrow syndrome affects hearing, vision, and development to varying degrees, so day-to-day life often centers on supports like hearing aids, vision care, speech therapy, and learning accommodations. Many people ask, “What does this mean for my future?”, and the honest answer is that the outlook depends on which features are most prominent for you and how early services start.
Prognosis refers to how a condition tends to change or stabilize over time. In Donnai-Barrow syndrome, hearing loss is usually present early and tends to be permanent, while vision problems may progress, so regular eye and ear checks are important. Some people experience feeding or growth difficulties in infancy, while others notice mostly learning differences and sensory challenges as they grow. Serious complications like brain or heart malformations are less common but can shape health needs and, in rare cases, survival. With ongoing care, many people maintain meaningful communication, mobility, and participation in school or work, especially when early symptoms of Donnai-Barrow syndrome are recognized and treated promptly.
Early care can make a real difference in quality of life and independence. Life span can be near typical for those without major organ complications, though outcomes vary when severe brain or structural issues are present. Talk with your doctor about what your personal outlook might look like, including monitoring plans for hearing, vision, growth, and any structural concerns. Genetic testing can sometimes provide more insight into prognosis, and not everyone with the same gene change will have the same outlook.
Long-term effects
Donnai-Barrow syndrome is a lifelong, genetic condition, and many features begin in infancy and evolve over time. Early symptoms of Donnai-Barrow syndrome often involve vision, hearing, and development, and these can continue into school years and adulthood in different ways. Long-term effects vary widely, so two people with the same diagnosis may have very different day-to-day needs. Thinking about the long-term effects helps families and clinicians plan follow-up across childhood and adulthood.
Severe short-sightedness and other eye differences can lead to blurred vision in childhood. Over time, some develop retinal problems that raise the risk of vision loss.
Many people have permanent, sensorineural hearing loss that can slowly progress. This can affect speech clarity and learning in noisy settings.
Global developmental delay often appears in early childhood and may continue as intellectual disability. Learning profiles vary, and strengths in routine and visual learning are common.
Differences such as underdevelopment of the corpus callosum can affect coordination, attention, and processing speed. These traits usually persist but may become easier to navigate with maturity.
How is it to live with Donnai-barrow syndrome?
Living with Donnai–Barrow syndrome often means weaving medical care into everyday routines, with regular check-ins for hearing, vision, kidney function, and developmental support. Many find that early hearing aids or cochlear implants, low-vision tools, speech and physical therapy, and structured learning plans help children build communication and independence over time. Day to day, families often plan for extra time, quiet spaces, and visual or tactile cues, and they may use assistive technology to make school and social life smoother. For those around the person—parents, siblings, teachers, friends—clear communication, patience, and consistent routines can lower stress and make participation in family life, play, and community activities not only possible but rewarding.
Treatment and drugs
Treatment for Donnai-Barrow syndrome focuses on supportive care tailored to each person’s needs, since there’s no single cure for the condition. Care often includes early developmental therapies (speech, physical, and occupational therapy), hearing support such as hearing aids or cochlear implants, and vision care for nearsightedness or other eye issues. Doctors may monitor and treat complications like kidney problems, hernias, and, when present, a cleft lip or palate; surgery is considered for structural issues that affect function or health. Regular check-ins with a coordinated team—pediatrics, genetics, audiology, ophthalmology, nephrology, and sometimes neurology—help track growth, learning, and organ health over time. Supportive care can make a real difference in how you feel day to day.
Non-drug treatment
Living with Donnai-Barrow syndrome often means coordinating care across hearing, vision, growth, learning, and kidney health. Alongside medicines, non-drug therapies can support everyday function and help prevent complications. Starting early matters, because early symptoms of Donnai-Barrow syndrome—like feeding challenges, low muscle tone, or vision and hearing differences—can affect development. Care plans are tailored to each child and adjusted as needs change over time.
Therapies in infancy and toddler years target movement, communication, and daily skills. Structured programs, like early intervention services, can help children build a strong foundation.
Regular audiology checks guide timing for hearing aids or cochlear implants. Better hearing access supports speech, learning, and social connection.
Frequent eye exams address severe nearsightedness, crossed eyes, and risk for retinal problems. Low-vision tools and protective eyewear can improve safety and independence.
Exercises build core strength, balance, and endurance to counter low muscle tone. Home programs keep progress going between visits.
Your genes may have an impact on how drugs work for you
Even when two people share Donnai-Barrow syndrome, their bodies can handle the same medicine differently because of genetic variation in drug-processing enzymes and transporters. Pharmacogenetic testing, when available, can help tailor doses, choose safer options, and reduce side effects.
Pharmacological treatments
Medications for Donnai-Barrow syndrome focus on easing day-to-day issues like reflux, seizures, and nutrient losses rather than changing the underlying gene. Drugs that target symptoms directly are called symptomatic treatments. Early symptoms of Donnai-Barrow syndrome such as reflux or feeding difficulties may improve with acid-reducing medicines. Vitamin supplements are often used because certain nutrients can be lost in the urine with this condition.
Retinol or retinyl palmitate may be prescribed to prevent or treat deficiency linked to urinary vitamin loss. Doses are tailored to blood levels, with regular checks to avoid side effects like liver strain or vision changes.
Cholecalciferol (vitamin D3) or, in select cases, calcitriol may be used to keep bones strong and correct low levels. Doctors often pair this with calcium if needed and monitor calcium and kidney function.
Proton pump inhibitors such as omeprazole or esomeprazole, or H2 blockers like famotidine, can reduce stomach acid and ease feeding discomfort. This may help growth and sleep in infants and young children.
If seizures occur, options like levetiracetam or lamotrigine are commonly used. Choice depends on seizure type and tolerance, with regular follow-up to fine-tune dosing.
Genetic influences
Donnai-Barrow syndrome is caused by changes in a single gene called LRP2 and is inherited in an autosomal recessive way. This means a child needs two altered copies—one from each parent—to develop the condition. A “carrier” means you hold the gene change but may not show symptoms. If both parents are carriers, each pregnancy has a 25% (1 in 4) chance of Donnai-Barrow syndrome, a 50% (1 in 2) chance the child will be a carrier, and a 25% chance the child inherits neither change. The LRP2 gene makes a protein called megalin that helps certain cells take in and recycle small nutrients and proteins, especially in the kidneys, eyes, ears, and developing brain, which helps explain the range of features seen in this condition. Genetic testing for Donnai-Barrow syndrome can confirm the diagnosis, identify carriers in the family, and guide future pregnancy planning.
Is Donnai-barrow syndrome genetic?
Genetics is central in Donnai-Barrow syndrome: it’s caused by inherited changes in the LRP2 gene. Most cases are autosomal recessive, so both parents are typically carriers. Genetic testing confirms the diagnosis and helps with family planning and recurrence risks.
Pharmacogenetics—how genetics influence drug effects
Care for Donnai-Barrow syndrome is symptom-focused—hearing support, vision care, vitamin supplementation, and surgeries when needed—so medicines are chosen based on the person’s needs rather than a single targeted drug. The LRP2 gene change behind Donnai-Barrow syndrome does not usually alter how the liver processes most medications, but it can affect how the kidneys reclaim certain vitamins and proteins, so doses of fat‑soluble vitamins may need close monitoring. This is why clinicians often check blood levels and adjust vitamin A, D, and E supplementation to balance benefit and safety. Genetic testing can sometimes identify how your body handles certain medicines, such as some pain relievers or anti‑seizure drugs, which may be used during care for Donnai-Barrow syndrome. There aren’t Donnai-Barrow–specific pharmacogenetic dosing guidelines, so teams apply general pharmacogenetic advice when it’s relevant and tailor treatment to the individual. Keep your care team updated about any unexpected side effects and bring an accurate list of all medicines and supplements to visits, since needs can change over time in Donnai-Barrow syndrome.
Interactions with other conditions
People with Donnai-Barrow syndrome often also face breathing, kidney, hearing, and vision challenges, so other illnesses in these areas can have a bigger impact than usual. Doctors call it a “comorbidity” when two conditions occur together. In infancy, early symptoms of Donnai-Barrow syndrome like breathing or feeding difficulties can be compounded by reflux or common viral infections, and if there’s a diaphragmatic hernia or past lung surgery, even a routine chest infection may strain breathing more than expected. Because the kidneys may lose small proteins, dehydration from stomach bugs or heat, and medicines that can stress the kidneys (such as high‑dose NSAIDs or certain IV contrast dyes) warrant extra caution and a plan with the care team. Hearing loss means ear infections and ototoxic drugs, including some aminoglycoside antibiotics or loop diuretics, need careful consideration to avoid further harm. Severe nearsightedness can come with more fragile retinas, so eye trauma or conditions that raise eye pressure may increase the risk of retinal problems. These interactions vary widely, so coordinated care among genetics, pediatrics, kidney, ear–nose–throat, and eye specialists can help anticipate risks and adjust treatments early.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
History
Throughout history, people have described babies with wide-set eyes, a deep groove above the lip, and early feeding troubles, details that echo what we now recognize as Donnai-Barrow syndrome. Families sometimes remembered a relative who was small for age, wore hearing aids, and had vision problems from childhood. In some communities, children with this mix of features were cared for closely at home, and their stories passed by word of mouth rather than written records.
First described in the medical literature as a distinct pattern in the late 20th century, Donnai-Barrow syndrome was initially pieced together from careful bedside observations. Early reports linked facial features with low muscle tone, hernias, and changes in the eyes and ears. Over time, descriptions became more precise as more children were identified, and doctors noticed a recurring set of findings that set this condition apart from other rare syndromes.
As medical science evolved, imaging and eye examinations clarified the structural changes behind the vision concerns, and hearing tests confirmed that hearing loss was common. Pediatric growth charts, developmental assessments, and detailed photographs helped clinicians document the range of features. These early steps made it possible to recognize Donnai-Barrow syndrome earlier, including in newborns with feeding and breathing challenges.
Advances in genetics then explained why these features clustered together. Researchers found that changes in a single gene involved in moving certain proteins inside cells could lead to the full picture of Donnai-Barrow syndrome. This discovery confirmed inheritance within families and allowed for reliable genetic testing. It also helped distinguish the condition from look-alike syndromes that share some facial or developmental traits but have different causes and outlooks.
In recent decades, awareness has grown as case reports from different countries showed that Donnai-Barrow syndrome occurs across many populations. Clinicians learned that the condition can vary: some children have severe vision and hearing loss early on, while others have milder changes that emerge over time. This variability, once a source of confusion, is now part of the established history and guides today’s approach to screening and support.
Today, the history of Donnai-Barrow syndrome reflects a steady shift from scattered observations to a clear, gene-defined diagnosis. Knowing the condition’s history helps explain why thorough evaluations—of vision, hearing, growth, and development—remain central, and why genetic confirmation is now standard. It also underscores how family stories and early clinical notes laid the groundwork for modern care, giving people with Donnai-Barrow syndrome a more certain path to answers and tailored support.