Joubert syndrome 31 is a rare genetic condition that affects brain development and body coordination. Early signs of Joubert syndrome 31 often appear in infancy or early childhood and can include low muscle tone, delayed development, unusual eye movements, and problems with balance or breathing. Not everyone will have the same experience, and some people with Joubert syndrome 31 also have vision, kidney, or liver problems. Joubert syndrome 31 is lifelong, and treatment focuses on supportive care such as physical, occupational, and speech therapy plus monitoring for related organ problems. Life expectancy can vary because severity differs from person to person, but outcomes are often closely linked to how much the brain and other organs are affected.
How many people live with Joubert syndrome 31?
No reliable worldwide or U.S. count is published just for Joubert syndrome 31, because this is one very rare named type of Joubert syndrome and cases are usually counted under Joubert syndrome as a whole. For Joubert syndrome overall, the often-cited rate of about 1 in 80,000 to 1 in 100,000 newborns suggests roughly 81,000 to 101,000 people worldwide (GeneReviews, 2017; United Nations, 2024) and about 3,400 to 4,300 people in the United States (GeneReviews, 2017; U.S. Census Bureau, 2024).
Overview
Joubert syndrome 31Symptoms
Joubert syndrome 31 often involves low muscle tone, poor balance, unusual eye movements, and delays in sitting, walking, or speech. In early childhood, some children also have breathing changes and distinctive brain and facial features.
Outlook and prognosis
Outlook in Joubert syndrome 31 varies. Many children need ongoing therapy and developmental support, but some gain walking, communication, and daily living skills. Prognosis mainly depends on how strongly the brain, kidneys, eyes, and liver are affected.
Causes and risk factors
Joubert syndrome 31 is caused by changes in the CPLANE1 gene, usually inherited when both parents pass on a nonworking copy. Risk is higher with a family history, related parents, or a previous affected child.
Genetic influences
Genetics are central to Joubert syndrome 31, which is caused by disease-causing changes in a specific gene. Different genetic variations can affect how severe symptoms are and help explain why signs can vary from one family or person to another.
Diagnosis
Doctors diagnose Joubert syndrome 31 by recognizing key clinical features and brain imaging findings, especially the characteristic cerebellar changes. Genetic testing can then confirm the diagnosis of Joubert syndrome 31 and help clarify the exact gene change.
Treatment and drugs
Treatment for Joubert syndrome 31 focuses on everyday needs: physical, occupational, and speech therapy, plus early learning support. Some children also need care for breathing, eye movement, kidney, or liver problems, with regular follow-up.
Symptoms
Children and adults living with Joubert syndrome 31 often have challenges with movement, balance, and development that can shape everyday life from infancy onward. Early on, this might look like poor head control, unusual eye movements, or delays in sitting and walking. The early features of Joubert syndrome 31 can vary widely, and some people also develop vision, kidney, or liver problems. Because this is a genetic condition present from birth, doctors usually describe features or signs rather than symptoms.
Babies often feel floppy and may have trouble with head control, feeding, or staying upright when held. Low muscle tone can make everyday tasks like tummy time, sitting, and later walking more difficult.
Many children reach milestones such as rolling, sitting, crawling, and walking later than expected. In Joubert syndrome 31, the pace can vary a lot, with some children needing ongoing physical and occupational therapy.
Walking may look wide-based or unsteady, and falls can happen more often. Fine motor tasks like using utensils, fastening buttons, or handwriting may also take extra effort.
Some children have trouble moving their eyes smoothly, especially when shifting gaze from one object to another. This can make tracking toys, making eye contact, or later reading text harder.
How people usually first notice Joubert syndrome 31?
How Joubert syndrome 31 is first noticed often begins in infancy, when families or doctors see low muscle tone, unusual eye movements, or a baby who has trouble coordinating sucking, swallowing, or breathing smoothly. As the first signs of Joubert syndrome 31 become clearer, many children show developmental delays, especially with head control, sitting, walking, and speech, and some may later develop an unsteady, wide-based walk. In some cases, the condition is first suspected after brain imaging shows the characteristic molar tooth sign, while in others it is recognized because the combination of early movement, breathing, and developmental differences points doctors toward a genetic cause.
Types of Joubert syndrome 31
No distinct types of Joubert syndrome 31 are widely recognized.
Can I slow down the onset of symptoms?
No, there is no good evidence that lifestyle changes or medicines can delay the start of symptoms in Joubert syndrome 31, because it is a rare genetic condition that usually shows up in babies or young children as the brain and body develop. Healthy habits like good sleep, regular activity, and balanced meals are still important for overall health, but they have not been shown to prevent Joubert syndrome 31 or push back when it begins; what often helps most is early care, including therapy for movement, speech, and feeding, along with regular checkups for breathing, vision, kidney, and liver problems. This cannot stop the condition from starting, but early support may help many living with Joubert syndrome 31 do as well as possible.
What genetics can tell you about symptoms
In Joubert syndrome 31, genetics can give some clues about symptoms, but they usually cannot predict the exact day-to-day picture for one child or adult. Changes in the gene linked to this type can affect how the brain, eyes, kidneys, and other parts of the body develop, so the gene change may influence which features appear, how severe problems with balance, coordination, vision, learning, or breathing are, and when they first become noticeable. Even so, many living with Joubert syndrome 31 have a wide range of symptoms, so people with the same diagnosis can be affected quite differently.
Causes and risk factors
The main cause of Joubert syndrome 31 is a harmful inherited gene change that disrupts tiny cell structures called cilia during early development. In many families, it happens when both parents pass on the same changed gene, even though they are healthy themselves. Knowing your family history is a good first step, and the chance is higher if there is already a child with Joubert syndrome 31 in the family. Lifestyle, diet, and everyday exposures do not usually cause Joubert syndrome 31, but they can still affect overall health and how challenging symptoms feel. If you are looking into the causes of Joubert syndrome 31, a genetics specialist can help explain carrier risk and future pregnancy risk.
What are the most common causes or risk factors?
Joubert syndrome 31 is usually caused by an inherited change in a gene that affects how the brain and other parts of the body develop before birth. The main risk factors are having a family history of the condition, having two parents who both carry the same changed gene, and parents being blood relatives, which makes sharing the same rare gene change more likely. There are no known lifestyle or pregnancy-related causes, so it is not something a parent caused.
Environmental and biological risk factors
When people look up risk factors for Joubert syndrome 31, they often want to know whether something during pregnancy or around birth raised the chance of it happening. Awareness of both biological and environmental influences helps you feel prepared. So far, researchers have not found strong, consistent non-genetic risk factors for Joubert syndrome 31.
At present, no well-established environmental or body-based factor has been shown to reliably increase the chance of Joubert syndrome 31. For many families, this means there is usually no clear outside cause to point to.
Older maternal or paternal age is not a recognized risk factor for Joubert syndrome 31 based on current evidence. This is different from some chromosome conditions, where age at conception can matter more.
Infections, medications, radiation, air pollution, and other exposures during pregnancy have not been consistently linked to this syndrome. Researchers continue to study rare conditions, but no specific exposure is currently accepted as a proven cause.
Common maternal health problems, such as diabetes, obesity, or high blood pressure, have not been clearly tied to this subtype. These conditions still matter for pregnancy care, but they are not established risk factors here.
Genetic risk factors
The genetic causes of Joubert syndrome 31 center on harmful changes in a gene involved in cilia, the tiny hair-like structures that help guide early development. Some risk factors are inherited through our genes. The main inherited risk is having two parents who both carry a nonworking copy of the same gene, even if neither parent has symptoms. If a family gene change is already known, doctors can often give a clearer estimate of the chance in future pregnancies.
Cilia gene: Joubert syndrome 31 is caused by disease-causing changes in a gene needed for normal cilia function. When cilia do not work as they should during early development, parts of the brain that help with balance, eye movements, and coordination may form differently.
Recessive inheritance: Joubert syndrome 31 is usually inherited in an autosomal recessive pattern, which means a child receives one altered copy of the gene from each parent. A single altered copy usually does not cause the syndrome.
Carrier parents: If both parents are carriers, each pregnancy has a 1 in 4, or 25%, chance of Joubert syndrome 31. Each pregnancy also has a 1 in 2, or 50%, chance that the child will be an unaffected carrier.
Family history: A known family history of Joubert syndrome 31, or of the same gene change, raises the chance that other relatives may also be carriers or affected. This matters especially when a brother or sister has already been diagnosed.
Related parents: When parents are biologically related, they have a higher chance of carrying the same rare gene change inherited from a shared ancestor. This can increase the risk of recessive conditions such as Joubert syndrome 31.
Lifestyle risk factors
Joubert syndrome 31 is a genetic condition, so lifestyle habits do not cause it. Still, how lifestyle affects Joubert syndrome 31 can be important for mobility, feeding, breathing, safety, and day-to-day function. The most helpful habits are those that support symptoms the person already has and lower the chance of complications. Care plans are usually individualized because severity varies widely.
Regular, guided physical activity can help maintain strength, balance, coordination, and endurance in people with Joubert syndrome 31. Exercise programs usually work best when adapted by physical or occupational therapists to reduce falls and frustration.
Good nutrition supports growth, energy, and overall resilience, especially if low muscle tone or developmental challenges make eating harder. If chewing or swallowing is affected, meal texture changes and slower, supervised feeding may lower the risk of choking or poor weight gain.
Consistent sleep habits can support behavior, attention, and daytime functioning in children and adults with Joubert syndrome 31. Because some affected people have abnormal breathing patterns or sleep-disordered breathing, poor sleep routines can worsen fatigue and symptom management.
Alcohol, sedatives, and other substances that slow breathing may be especially risky in Joubert syndrome 31 if respiratory control is already vulnerable. Avoiding unnecessary respiratory depressants can help reduce episodes of excessive sleepiness, low oxygen, or breathing instability.
Risk prevention
For families affected by Joubert syndrome 31, true prevention of the condition itself is usually not possible because it is a genetic disorder present from conception. In daily life, prevention is mostly about lowering the risk of complications, spotting problems early, and supporting development, breathing, vision, and kidney health. Different people need different prevention strategies—there’s no single formula.
If Joubert syndrome 31 has been diagnosed in a child or runs in the family, genetic counseling can help clarify recurrence risk before a future pregnancy. It may also help families understand testing options for relatives or during pregnancy.
Ongoing care with a pediatrician and the right specialists can help catch complications before they become more serious. This is especially important because some early symptoms of Joubert syndrome 31, such as abnormal breathing, vision problems, or delayed development, can change over time.
Some people with Joubert syndrome 31 can develop kidney problems, so regular urine tests, blood tests, and blood pressure checks may lower the chance of late detection. Early treatment can help protect kidney function for as long as possible.
Routine eye exams can help find reduced vision, unusual eye movements, or other eye problems that may affect learning and safety. Early support, including low-vision services when needed, can make day-to-day activities easier.
Can you prevent Joubert syndrome 31?
No, Joubert syndrome 31 cannot usually be prevented, because it is caused by a change in a gene that is present from before birth. Nothing during pregnancy, diet, exercise, or everyday habits is known to stop it from happening. If this condition runs in your family, genetic counseling before or during pregnancy may help you understand the chances for a future child, but it cannot prevent the condition in someone who already has it.
Transmission
Joubert syndrome 31 is not contagious, so it cannot be passed from one person to another through touch, coughing, kissing, food, or sex. Instead, the genetic transmission of Joubert syndrome 31 usually happens within a family when a child inherits two changed copies of the related gene, one from each parent.
In most families, the parents are healthy carriers and do not have the condition themselves. When both parents carry the same gene change, each pregnancy has a 1 in 4, or 25%, chance that the baby will have Joubert syndrome 31, which is why families often ask about how Joubert syndrome 31 is inherited.
When to test your genes
Genetic testing for Joubert syndrome 31 is usually considered when a baby or child has features such as low muscle tone, developmental delay, abnormal eye movements, breathing irregularities, or the characteristic brain finding on MRI. It is also useful for families with a known history, to confirm the diagnosis, guide kidney and eye monitoring, and support future pregnancy planning.
Diagnosis
Joubert syndrome 31 is usually suspected when a child has a pattern of early signs such as low muscle tone, delays in sitting or walking, unusual breathing episodes in infancy, or abnormal eye movements. Doctors often combine what they see on the exam with brain imaging and genetic testing, because the diagnosis of Joubert syndrome 31 is based on both clinical features and a confirmed gene change. Getting a diagnosis is often a turning point toward answers and support.
Doctors ask about pregnancy, early development, feeding, breathing, balance, and eye movement concerns. A detailed family and health history can help show whether similar features may run in the family.
The exam looks for low muscle tone, coordination problems, unusual eye movements, and delays in motor skills. Doctors also check growth, head size, and other body features that may point to a related genetic condition.
MRI scans look for a characteristic brain pattern called the molar tooth sign, which strongly supports Joubert syndrome. This imaging finding helps distinguish Joubert syndrome 31 from some other causes of developmental delay and poor coordination.
Genetic tests are used to look for a disease-causing change in the gene linked to Joubert syndrome 31. If the first test is unclear, broader testing may be offered because several genes can cause very similar features.
How is Joubert syndrome 31 diagnosed?
Joubert syndrome 31 is usually diagnosed by putting together a child’s symptoms and development, such as low muscle tone, delays in sitting or walking, unusual eye movements, or breathing changes in infancy, along with a detailed brain scan called an MRI. The MRI often shows a very typical change in the part of the brain that helps control balance and coordination, which strongly supports the diagnosis. Genetic testing may then be used to confirm the exact cause and identify the specific subtype, but it is usually used alongside the exam and brain scan rather than on its own.
Stages of Joubert syndrome 31
Joubert syndrome 31 does not have defined progression stages. This is because it is a genetic condition that affects brain development, so doctors do not usually describe it as moving through set phases over time. Often the process begins when you notice changes in daily life, such as low muscle tone in infancy, delayed sitting or walking, unusual breathing patterns, or problems with balance and eye movements; these can be among the early symptoms of Joubert syndrome 31. Diagnosis is usually based on symptoms, a brain MRI showing the characteristic changes in the area that helps control movement and coordination, and genetic testing to confirm the cause, while follow-up focuses on tracking development, vision, breathing, and kidney or liver health if needed.
Outlook and prognosis
The outlook for Joubert syndrome 31 is variable and depends largely on how severely the brain, breathing, vision, kidney, and liver are affected, and because this is a very rare subtype, prognosis is often estimated from Joubert syndrome more broadly rather than from large subtype-specific studies. Many affected children survive into adolescence and adulthood, especially when breathing problems in infancy are monitored and complications are treated early. Most people have persistent developmental, coordination, speech, and learning difficulties, although the degree of independence can range from mild support needs to substantial lifelong assistance. Vision loss, kidney disease, or liver involvement can worsen long-term health and may become major determinants of disability and quality of life. Mortality is highest in infants with severe apnea or in patients who develop serious kidney or liver complications, but life expectancy can be near normal in milder cases with careful multidisciplinary follow-up.
Long-term effects
Many living with Joubert syndrome 31 have lifelong challenges with movement, coordination, and development, but the overall picture can vary a lot. The long-term effects of Joubert syndrome 31 may range from mild day-to-day limits to broader needs with learning, vision, breathing, or organ health. Long-term effects vary widely, and some features are present from early childhood while others become clearer over time.
Unsteady walking, poor coordination, and low muscle tone often continue into later childhood and adulthood. For many, this can mean needing extra time for stairs, sports, writing, or other tasks that depend on smooth, controlled movement.
Many people with Joubert syndrome 31 have lasting differences in speech, learning, and everyday skills. The level of support needed can vary from mild school help to ongoing assistance with communication and independent living.
Some may find that unusual eye movements, trouble tracking objects, or reduced vision continue over time. In some families, vision problems can become more noticeable with age and affect reading, mobility, and other daily activities.
Irregular breathing is often most noticeable in infancy, but some breathing-related issues can persist in a milder form later on. This may include disrupted sleep or pauses in breathing that affect energy and concentration during the day.
How is it to live with Joubert syndrome 31?
Living with Joubert syndrome 31 can mean navigating a wide range of day-to-day challenges, often starting in early childhood, because balance, coordination, muscle tone, eye movements, breathing patterns, learning, and development can all be affected to different degrees. For many people with this condition, daily life may involve physical, occupational, speech, and educational support, along with regular visits to specialists, while some may also need help with mobility, communication, or personal care. Family members and other close caregivers are often deeply involved in routines, appointments, and advocacy, which can be demanding, but with steady support and the right therapies, many living with Joubert syndrome build meaningful routines, relationships, and skills in ways that fit their own strengths.
Treatment and drugs
Joubert syndrome 31 is treated by focusing on each person’s symptoms and daily needs, since there is no single cure that fixes the underlying genetic change. Treatment plans often combine several approaches. These can include physical, occupational, and speech therapy, help with feeding or breathing problems in infancy, vision care, and medicines or other treatment if seizures, abnormal breathing, kidney disease, or liver problems are present. For many people, treatment begins with small daily steps, such as exercises to build balance and coordination or regular follow-up visits to watch for complications that can appear over time. Because early symptoms of Joubert syndrome 31 and later health issues can vary widely, care is usually guided by a team that may include neurology, eye, kidney, liver, and developmental specialists.
Can you cure Joubert syndrome 31?
No, there is currently no cure for Joubert syndrome 31. Treatment cannot remove the condition, but it can help manage symptoms and support day-to-day life, often through physical, occupational, and speech therapy, along with care for breathing, feeding, vision, kidney, or development problems if they happen. Regular checkups are important because needs can vary from one person to another.
Non-drug treatment
Daily life with Joubert syndrome 31 often centers on building skills, easing symptoms, and supporting breathing, feeding, vision, and learning. Treatment is usually supportive and tailored to the challenges each child or adult has, since symptoms can vary a lot from one family to another. Non-drug treatments often lay the foundation for care, with therapists, teachers, and specialists helping people with Joubert syndrome 31 function as safely and independently as possible.
Physical therapy can help with low muscle tone, poor balance, and delayed motor milestones such as sitting, walking, and climbing stairs. For many, this can mean practicing posture, strength, coordination, and safer movement in daily life.
Occupational therapy focuses on everyday skills like dressing, using the hands, sitting well, and taking part in school or home routines. Some may find adaptive tools or seating helpful for improving comfort and independence.
Speech and language therapy can support communication, especially if speech is delayed or hard to understand. It may also include augmentative communication tools, such as picture systems or speech devices, for people with Joubert syndrome 31 who need another way to express themselves.
Feeding therapy can help when chewing, swallowing, or coordinating breathing with feeding is difficult. This is especially important in infants and young children, when early symptoms of Joubert syndrome 31 may include poor feeding, slow weight gain, or choking during meals.
Your genes may have an impact on how drugs work for you
For people living with Joubert syndrome 31, there is no well-established proof that the genetic change itself predictably changes how most commonly used medicines work. In day-to-day care, medicine response is more often shaped by health problems that can come with this condition, such as kidney or liver involvement, because these organs help clear medicines from the body and may make side effects more likely or doses harder to judge. This means a treatment that seems routine for seizures, behavior, sleep, or other symptoms may still need careful follow-up, with doctors adjusting the amount based on how the person responds.
Pharmacological treatments
Day-to-day treatment for Joubert syndrome 31 usually focuses on the problems a person is actually having, because there is no medicine that corrects the underlying genetic change. In practice, medications for Joubert syndrome 31 are used to manage complications such as seizures, muscle stiffness, breathing-related issues in selected infants, and kidney problems when they occur. Not everyone responds to the same medication in the same way, so care is usually tailored to age, symptoms, and which organs are affected.
If someone with Joubert syndrome 31 has seizures, doctors often use standard anti-seizure drugs such as levetiracetam, valproate, lamotrigine, or clobazam. The choice depends on seizure type, age, and side effect profile.
Baclofen or tizanidine may be used when tight muscles or spasticity make sitting, walking, dressing, or therapy sessions harder. These medicines can ease stiffness, but they may also cause sleepiness or weakness in some people.
In babies with significant apnea, caffeine citrate may sometimes be used to help reduce breathing pauses early in life. This is not needed for everyone, and breathing symptoms in Joubert syndrome 31 often require close specialist monitoring rather than medicine alone.
If Joubert syndrome 31 affects the kidneys and leads to high blood pressure or protein in the urine, medicines such as lisinopril or losartan may be prescribed. These drugs do not cure the syndrome, but they can help protect kidney function over time.
Genetic influences
When a baby has the movement, balance, and developmental differences linked to Joubert syndrome 31, families often want to know whether it was inherited. Joubert syndrome 31 is an inherited single-gene form of Joubert syndrome and is usually passed down in an autosomal recessive way, meaning a child receives one altered copy of the gene from each parent. A carrier means you hold the gene change but may not show symptoms, so parents are often healthy and may have no clue they carry it. Because of that, Joubert syndrome 31 can appear unexpectedly in a family, even when no relatives seem to have the condition. Genetic testing for Joubert syndrome 31 can help confirm the diagnosis, clarify the chance of it happening again in a future pregnancy, and show whether other relatives may also be carriers. This information can also help families plan care and decide whether meeting with a genetics specialist would be useful.
Is Joubert syndrome 31 genetic?
Genetics are central to Joubert syndrome 31, which is caused by disease-causing changes in a specific gene. Different genetic variations can affect how severe symptoms are and help explain why signs can vary from one family or person to another.
Having a genetic risk is not necessarily a diagnosis
Gene variants are a normal part of human biology and are widely seen in the general population. Most of these variants do not have a direct effect on health and are simply part of natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some cases, though, a single well-studied variant in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
In Joubert syndrome 31, the genetic change is most helpful for confirming the diagnosis and guiding follow-up, rather than matching someone to a single proven drug. At this point, treatment is mainly aimed at day-to-day problems such as abnormal breathing, low muscle tone, movement and balance difficulties, seizures if they occur, and vision, kidney, or liver complications. Genetics is only one factor, and doctors also choose medicines based on age, symptoms, and how well the kidneys and liver are working, since those organs can affect how the body handles a drug. For many living with Joubert syndrome 31, this can mean one child may need seizure medicine or sleep support, while another may need therapies and careful monitoring but few medications. There is no approved gene-specific medicine for Joubert syndrome 31 yet, but knowing the exact genetic subtype can help the care team watch for related health issues and avoid treatments that may be less safe when breathing or organ problems are present. If you are wondering about the best treatment for Joubert syndrome 31, genetic results usually help shape the overall care plan more than they predict a specific medication response.
Interactions with other conditions
For many living with Joubert syndrome 31, the main challenges are not only balance, movement, and development but also how the condition can overlap with problems in other organs. Doctors call it a “comorbidity” when two conditions occur together, and with Joubert syndrome 31 this may include eye problems, kidney disease, liver involvement, breathing irregularities, or sleep-related breathing issues. In everyday life, that can mean a child who is already working hard on coordination may also need monitoring for changes in vision, unusual tiredness, poor growth, or signs that the kidneys are not working as well as they should. Some people with Joubert syndrome 31 also have features that overlap with autism, seizures, or hormonal problems, although this varies from one person to another. Because of this, care is often shared across several specialists so one problem does not get missed while another is being treated. If there are new symptoms or a change from the usual pattern, it is worth asking the care team whether they could be linked to one of the known related conditions seen with Joubert syndrome 31.
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.
What other conditions can cause similar symptoms to Joubert syndrome 31?
Symptoms of Joubert syndrome 31 can overlap with cerebral palsy, autism, and other causes of developmental delay, especially when a child has low muscle tone, poor balance, unusual eye movements, or is late to sit, walk, or talk. Doctors may also consider Dandy-Walker syndrome and other rare inherited conditions that affect how the back of the brain develops, because these can cause similar problems with movement, coordination, and breathing. In practice, the exact cause is often sorted out by brain scans and genetic testing, since several conditions can look alike early in life.
History
Many living with Joubert syndrome 31 spend years trying to make sense of signs that started early, such as low muscle tone, unusual eye movements, breathing changes in infancy, or delays in sitting and walking. These patterns were not always recognized as part of one condition. In 1969, researchers first described Joubert syndrome in children who shared problems with balance, development, eye movement, and episodes of abnormal breathing.
As medical science evolved, doctors learned that the condition was linked to changes in how part of the brain develops before birth, especially the area that helps control coordination and breathing. Brain scans later made it much easier to recognize, because many people with Joubert syndrome have a distinctive appearance in this region that specialists can see on MRI. Over time, it also became clear that Joubert syndrome is not the same in everyone. Some people are mainly affected by movement and development, while others may also have eye, kidney, or liver problems.
That growing understanding helped explain why early symptoms of Joubert syndrome could look different from one child to another. Some families were first told their child had only a developmental delay or a separate neurologic problem, and the fuller picture became clear later. Researchers eventually found that Joubert syndrome includes several genetic forms, and Joubert syndrome 31 is one of these recognized types. For families today, this history matters because it shows how diagnosis has become more precise, even though the day-to-day challenges can still vary widely from one person to the next.