NAA15 Support
Understanding a Rare Genetic Condition and Supporting Families Through Every Stage
NAA15-related disorder is rare, still being actively studied, and can affect development, behavior, the nervous system, and sometimes the heart. No two individuals are exactly the same. Because information can be limited and hard to find, many families feel isolated in the beginning. Our goal is to change that by bringing together clear, honest information, real experiences, and a supportive community so no one has to face this journey alone.
What is NAA15?
NAA15 is a gene that plays an important role in how cells process proteins. Specifically, it encodes a subunit of the NatA complex, a molecular machine responsible for chemically modifying the ends of newly made proteins. This process, called N-terminal acetylation, affects the stability, folding, and function of a large portion of all human proteins.
When a pathogenic variant occurs in the NAA15 gene, this protein processing system is disrupted. The effects are felt most strongly during brain development, when precise protein regulation is critical. But NAA15 is active throughout the body, which is why some individuals also experience effects on the heart and other organ systems.
NAA15-related disorder is associated with neurodevelopmental differences including intellectual disability, autism spectrum disorder, speech and motor delays, and in some cases, congenital anomalies and cardiac disease. The condition was first described in the medical literature in 2018, and our understanding of it continues to grow as more individuals are identified.
Key Facts
How Rare is NAA15?
Ultra-Rare
NAA15-related disorder is considered ultra-rare. Only a small number of individuals have been described in the published medical literature to date, though the true number is likely higher as awareness and access to genetic testing continue to improve globally.
Underdiagnosed
Many families only reach a diagnosis after years of searching. Because NAA15 overlaps clinically with other neurodevelopmental conditions, it is frequently missed until exome or genome sequencing is performed.
Growing Recognition
Published case counts have changed significantly over time as new individuals are identified. As genetic testing becomes more widely available, more families are receiving answers that were previously out of reach.
Common Features of NAA15
NAA15 presents differently in every individual. The features below are drawn from published case series and family reports. Not every person will have every feature, and severity varies widely.
Developmental Delay
Most children with NAA15-related disorder reach developmental milestones later than expected. This can include sitting, walking, and learning to communicate. The degree of delay varies considerably from one child to the next. Some children catch up meaningfully with early intervention, while others continue to need significant support throughout childhood and into adulthood.
Speech and Language Delay
Speech delay is one of the most consistently reported features. Many children are late to say their first words, and expressive language tends to be more affected than the ability to understand what is being said. Some individuals become fluent communicators over time. Others remain minimally verbal or use augmentative and alternative communication (AAC) devices. Early speech therapy makes a real difference.
Motor Delay and Hypotonia
Low muscle tone, known as hypotonia, is common in infancy and early childhood. It can affect how a child holds their head, sits, stands, and walks. Gross motor milestones are often delayed, and fine motor skills may also be affected. Physical and occupational therapy are important parts of early intervention for most children with NAA15.
Intellectual Disability
Intellectual disability is reported across the NAA15 population, but the range is wide. Some individuals have mild cognitive differences that allow for meaningful independence. Others have moderate to severe intellectual disability and require lifelong support. It is genuinely difficult to predict where any individual child will fall on this spectrum, which is one of the hardest parts of this diagnosis for families.
Autism and Behavioral Differences
Autism spectrum disorder has been reported in a significant portion of individuals with NAA15-related disorder. Behavioral differences including hyperactivity, impulsivity, aggression, and self-injurious behavior are also described. These challenges are real and can be exhausting for families. Behavioral therapy, structured environments, and individualized support plans can help.
Feeding and Growth
Feeding difficulties are reported in some children, particularly in infancy. Oral motor dysfunction, poor suck, texture aversions, and slow weight gain can all occur. Feeding therapy and nutritional support are sometimes needed. Growth concerns are not universal but should be monitored, especially in children with more complex medical involvement.
Seizures and Neurologic Differences
Seizures are not present in every individual with NAA15, but they are reported in a meaningful subset. Various seizure types have been described. Neurologic findings can also include movement differences, abnormal tone, and findings on brain MRI in some individuals. Neurology follow-up is an important part of ongoing care.
Congenital Heart Defects and Cardiomyopathy
Cardiac involvement has been reported in a subset of individuals with NAA15-related disorder. This includes structural congenital heart defects as well as hypertrophic cardiomyopathy, a condition where the heart muscle becomes abnormally thick. The cardiac findings are not present in all individuals, but they are significant enough that cardiology evaluation is recommended at the time of diagnosis and with ongoing monitoring.
Vision and Other Associated Findings
Strabismus, refractive errors, and other vision concerns have been reported. Some individuals have dysmorphic facial features. Other associated findings vary across the published literature. Regular developmental monitoring and subspecialty follow-up help identify and address these concerns as they arise.
Autism and NAA15
Autism spectrum disorder has been reported in many individuals with NAA15-related disorder. For some families, an autism diagnosis actually comes first, before the underlying genetic cause is ever identified. This is part of why genetic testing is so important even after an autism diagnosis has been made.
The autism features seen in NAA15 can include difficulties with social communication, restricted interests, repetitive behaviors, and significant sensory sensitivities. Some children are highly social but struggle with the pragmatic aspects of communication. Others have more limited social engagement.
Applied behavior analysis, speech-language therapy, occupational therapy with a sensory integration focus, and structured educational environments are all part of supporting individuals with NAA15 who have autism features. Early identification and intervention matter.
Seizures and Neurologic Concerns
Seizures are not present in every individual with NAA15, but they are reported in a meaningful subset of the population. Various seizure types have been described in the literature, including absence seizures, tonic-clonic seizures, and focal seizures. Some individuals have EEG abnormalities even without clinically obvious seizures.
Beyond seizures, neurologic findings in NAA15 can include abnormal muscle tone, movement differences, and structural brain findings on MRI in some individuals. These findings are not universal, but they underscore the importance of neurology follow-up as part of ongoing care.
If seizures are present, management typically involves anti-epileptic medications selected based on seizure type and individual response. Families should work closely with a pediatric neurologist who is familiar with rare genetic epilepsies.
Heart and Cardiac Concerns
Cardiac involvement is one of the more serious aspects of NAA15-related disorder, and it is not present in every individual. But it is important enough that families and clinicians need to be aware of it from the time of diagnosis.
Structural congenital heart defects have been reported in some individuals with NAA15. These are abnormalities in the physical structure of the heart that are present from birth and may require monitoring or intervention depending on their nature and severity.
The published literature has also linked NAA15 to pediatric hypertrophic cardiomyopathy, a condition in which the heart muscle becomes abnormally thickened. This can affect the heart's ability to pump blood effectively and requires ongoing cardiology monitoring. Families should discuss cardiac evaluation with their genetics team at the time of diagnosis.
Cardiac Recommendations
Cardiology evaluation at the time of NAA15 diagnosis
Echocardiogram to assess heart structure and function
Ongoing cardiac monitoring, especially if hypertrophic cardiomyopathy is identified
Coordination between genetics, cardiology, and primary care
Inform all treating physicians of the cardiac history
The Hard Truth About NAA15
NAA15-related disorder is highly variable, and that variability is one of the most difficult things for families to sit with. There is no reliable way to predict, at the time of diagnosis, exactly how a child will be affected. Some children make meaningful developmental progress, have milder medical involvement, and go on to live rich, connected lives with appropriate support.
Others have more complex needs. Some individuals have significant intellectual disability, limited communication, and require substantial support throughout their lives. Some have neurologic complications including seizures that are difficult to control. And for a subset of individuals, cardiac involvement adds another layer of medical complexity that requires careful, ongoing management.
Serious cardiac events have been reported in the literature. We share this not to frighten families, but because honest information helps families advocate effectively for their children and ensures that the right monitoring is in place. Knowledge is protective.
It is also true that many families describe their children with NAA15 as joyful, loving, and deeply connected to the people around them. The challenges are real. So is the love, the progress, and the meaning that families find in this journey.
The foundational 2018 paper described 38 individuals from 33 unrelated families across 15+ international institutions. Since then, additional cohorts from China, Europe, and the US have expanded the known case count. The true number is likely higher as access to genetic testing improves globally.
Importantly, a 2022 Chinese cohort study documented possible catch-up developmental trajectories in some children with NAA15 — particularly in gross motor, language, and social skills — with early physical rehabilitation. This is an important and hopeful finding for families.
Tian et al. (2022) — Chinese Cohort, Catch-Up TrajectoriesHow is NAA15 Diagnosed?
Most families reach an NAA15 diagnosis after a long diagnostic journey. The path often starts with developmental concerns and ends with genetic testing that finally provides an answer.
Whole Exome Sequencing (WES)
The most common route to diagnosis. WES sequences all protein-coding regions of the genome and can identify pathogenic variants in NAA15. Trio-WES, which tests the child and both parents simultaneously, is the gold standard.
Genome Sequencing
Broader than exome sequencing, genome sequencing can identify variants in non-coding regions as well. It is increasingly available and may identify cases missed by exome sequencing.
Developmental Workup
Many children are referred for genetic testing after a developmental pediatrician or neurologist identifies a pattern of delays that warrants further investigation.
Autism Evaluation
Because autism features are common in NAA15, some individuals are first evaluated for ASD. Genetic testing is recommended for all individuals with autism and intellectual disability.
Seizure Workup
Children presenting with seizures of unknown cause often undergo genetic testing as part of their epilepsy workup, which can lead to an NAA15 diagnosis.
Cardiac Workup
In some cases, congenital heart disease or hypertrophic cardiomyopathy prompts genetic evaluation that ultimately identifies an NAA15 variant.
Trio-WES is the Gold Standard
NAA15 can be confirmed through Whole Exome Sequencing (WES), Whole Genome Sequencing (WGS), or targeted gene panels. Trio-WES — testing the child and both biological parents simultaneously — is widely considered the gold standard, as it confirms whether the variant is de novo or inherited. Ask your neurologist or geneticist about the best option for your situation.
Treatment and Management
There is no cure for NAA15-related disorder at this time. Treatment is focused on supportive care, early intervention, and addressing each individual's specific needs. The goal is to help every person reach their fullest potential.
Early Intervention
Starting therapy as early as possible has the greatest impact on developmental outcomes.
Speech Therapy
Addresses expressive and receptive language, feeding, and AAC when needed.
Occupational Therapy
Supports fine motor skills, sensory processing, and daily living activities.
Physical Therapy
Builds strength, coordination, and gross motor skills affected by hypotonia.
Developmental Pediatrics
Coordinates overall developmental care and connects families to services.
Neurology
Manages seizures, monitors neurologic development, and guides medication.
Cardiology
Evaluates and monitors cardiac involvement where present.
Genetics
Provides diagnosis, counseling, and connects families to research opportunities.
Educational Support
Individualized education plans (IEPs) tailored to each child's learning needs.
Behavioral Therapy
ABA and other approaches to support behavioral challenges and skill building.
Family Support
Counseling and resources for parents and siblings navigating this journey.
Community Connection
Connecting with other NAA15 families provides practical and emotional support.
You Are Not Alone
One of the most powerful things that happens when families connect with each other is the realization that someone else truly understands. Not just the medical complexity, but the emotional weight of it. The grief that comes with a diagnosis. The unexpected joy. The exhaustion. The advocacy. The love.
The NAA15 family community is small but deeply connected. Families share practical information about therapies, schools, insurance, and medical teams. They also share the harder things, and that matters just as much.
Our Facebook group is the primary gathering place for NAA15 families worldwide. It is a private, moderated space where families can ask questions, share updates, and find people who get it.
Join the NAA15 Facebook Group
Research and Hope
Research into NAA15-related disorder is still in its early stages, but it is moving forward. Each new case that is identified and reported adds to the collective understanding of this condition. Natural history studies, which follow individuals over time to document how the condition evolves, are particularly valuable for rare diseases like NAA15.
Simons Searchlight is one of the most important research resources for NAA15 families. Their registry collects data from individuals with NAA15 and other rare genetic conditions, and participation directly contributes to research that could one day lead to better treatments.
Families who participate in research, share their stories, and connect with the scientific community are not just helping their own children. They are helping every family that will receive this diagnosis in the future.
Simons Searchlight Registry
Enroll your child in the Simons Searchlight registry to contribute to NAA15 natural history research.
Published Research
Access peer-reviewed studies on NAA15 through PubMed and other scientific databases.
Orphanet
Orphanet maintains a comprehensive database of rare diseases including NAA15.
Human Disease Genes
A curated resource for clinicians and researchers studying NAA15 and related conditions.
Medical References
The information on this page is drawn from peer-reviewed literature and trusted rare disease resources. We encourage families and clinicians to consult these sources directly.
General Overview & Family Resources
Natural History / Longitudinal / Broader Phenotype
China / Developmental Trajectory / Inherited + De Novo Cases
Cardiac / Congenital Heart Disease
Neuroanatomy / Brain Imaging
Europe / Adult Phenotype
Medical Disclaimer: The information on this page is intended for educational purposes only and does not constitute medical advice. Always consult a qualified medical professional, clinical geneticist, or specialist for guidance specific to your child's situation.