Congenital disorder of deglycosylation 1 is a very rare inherited disease. Doctors also call it NGLY1 deficiency or NGLY1-congenital disorder of deglycosylation. It happens when both copies of the NGLY1 gene do not work well. This gene normally helps the body remove sugar chains from damaged or misfolded proteins so the cell can clear them away. When this step fails, abnormal proteins are not handled normally, and this can harm the brain, liver, eyes, nerves, and other parts of the body. The disease usually starts in infancy or early childhood, but the severity can be different from one child to another. [1][2]
Congenital disorder of deglycosylation 1 is usually called NGLY1 deficiency or NGLY1-CDDG. It is a very rare inherited disease caused by harmful changes in the NGLY1 gene. This gene normally helps the body remove sugar groups from damaged proteins so the cell can recycle them properly. When the gene does not work well, many body systems can be affected, especially the brain, liver, eyes, nerves, muscles, growth, and movement control. Common features include developmental delay, low muscle tone, unusual movements, poor or absent tear production, and liver test abnormalities. [1]
Other names
Other names used for this disease are NGLY1 deficiency, NGLY1-CDDG, deficiency of N-glycanase 1, and NGLY1-related congenital disorder of deglycosylation. Some older rare-disease sources also connect it with the description alacrimia-choreoathetosis-liver dysfunction syndrome, because many children have very low tears, unusual movements, and liver test changes. These names refer to the same core disorder caused by harmful changes in the NGLY1 gene. [1][2][3]
Types
There are no widely accepted formal subtypes like type 1, type 2, or type 3 for this disease in major clinical references. In practice, doctors describe it by severity and by the main body systems affected. A simple list view is: milder form, moderate form, severe multisystem form, form with seizures, form with major movement disorder, form with marked liver involvement, form with major eye and tear problems, and form with peripheral nerve involvement. This is a practical clinical way to describe patients, but it is not an official classification system. [1][4]
Causes
The main true cause of congenital disorder of deglycosylation 1 is biallelic pathogenic variants in the NGLY1 gene, meaning a child inherits one harmful copy from each parent. It is an autosomal recessive disorder. A parent usually carries one changed copy but often has no symptoms. When both gene copies are not working properly, the NGLY1 enzyme becomes absent or weak, and the disease develops. [1][2]
- Pathogenic variant in one NGLY1 copy from the mother is part of the genetic cause. By itself this usually does not cause the full disease, but it contributes to the recessive inheritance pattern. [1][2]
- Pathogenic variant in one NGLY1 copy from the father is the other part of the genetic cause. The child develops the disorder when both changed copies are inherited together. [1][2]
- Autosomal recessive inheritance is the genetic mechanism that explains why the disorder appears in a child even when the parents may look healthy. [1][2]
- Loss-of-function mutations in NGLY1 are a major cause. These variants greatly reduce or stop enzyme activity. [1][4]
- Frameshift mutations can cause the gene message to become abnormal and the protein to stop early. This can make the enzyme nonfunctional. [4][5]
- Nonsense mutations can create a premature stop signal in the gene, leading to a shortened enzyme that cannot work normally. [4]
- Missense mutations may change one amino acid in the enzyme and reduce how well it works. Some patients may still have a little residual function. [4][6]
- Splice-site mutations can disturb how the gene is read and assembled into messenger RNA, producing an abnormal protein. [4]
- Marked reduction of N-glycanase 1 enzyme activity is the direct biochemical cause of disease. Without enough activity, deglycosylation is impaired. [1][4]
- Failure to remove glycans from misfolded proteins causes cellular stress. This is one of the basic biological reasons symptoms develop. [1][4]
- Impaired protein quality-control pathways contribute to tissue injury. Cells cannot clear abnormal proteins as efficiently as they should. [4][7]
- Disruption of endoplasmic-reticulum-associated degradation pathways is another disease mechanism. This pathway normally helps process faulty proteins. [1][4]
- Cell stress in nerve tissue is a major reason neurologic symptoms are common. Brain and peripheral nerve cells are especially sensitive. [4][8]
- Abnormal proteasome-related regulation may worsen buildup of damaged proteins and disturb normal cell homeostasis. [7]
- Impaired neuronal survival under stress may contribute to progressive neurologic problems such as movement abnormalities and neuropathy. [5]
- Peripheral nerve damage mechanisms may help explain reduced reflexes and polyneuropathy reported in many patients. [8][9]
- Liver-cell stress from impaired protein handling may lead to elevated liver enzymes, especially in early childhood. [1][10]
- Genetic homozygosity, where the same harmful variant is inherited from both parents, can cause the disease in some families. [5]
- Compound heterozygosity, where two different harmful NGLY1 variants are inherited, can also cause the disorder. [1][4]
- Very rare inherited NGLY1 deficiency at birth is the final overall cause description. In simple words, the child is born with a genetic enzyme problem that affects body development and function from early life. [1][2]
Symptoms
- Global developmental delay is one of the most common symptoms. A child may sit, stand, walk, or speak later than expected. Learning and thinking skills can also be affected, from mild to very severe levels. [1][2]
- Intellectual disability may happen in many children. This means problems with learning, understanding, problem-solving, and daily living skills. Some children need lifelong help. [1]
- Hypotonia, or low muscle tone, is very common. The child may feel floppy, have poor head control, and tire easily during movement or feeding. [1][2]
- Movement disorder is a key symptom. Children may have unusual body movements such as twisting, jerking, shaking, or writhing movements. Doctors may describe these as choreiform, athetoid, dystonic, myoclonic, tremor-like, or dysmetric movements. [1]
- Little tears or no tears can happen. This is called hypolacrima or alacrima. Parents may notice that the child cries without tears, and the eyes may become dry or irritated. [1][2]
- Liver problems are common, especially in early childhood. Blood tests may show high liver enzymes, and some children may have jaundice or other liver-related findings. In many patients, the enzyme levels improve later. [1][2]
- Seizures can occur in about half of affected individuals. Some children have seizures that are difficult to control, while others may never develop them. [1][2]
- Feeding difficulty is another important symptom. A child may have weak mouth muscles, poor chewing or swallowing control, food spilling from the mouth, or slow feeding. [1]
- Speech delay is common. Some children speak very late, and some may have very limited spoken language because of both brain and motor problems. [2]
- Eye problems may occur, including dry eyes, optic nerve pallor or optic atrophy, retinal changes, squinting problems such as exotropia or esotropia, and damage from dry eye. [1][2]
- Sleep apnea can happen. The child may have pauses in breathing during sleep, noisy breathing, restless sleep, or daytime sleepiness. Both obstructive and central sleep apnea have been reported. [1]
- Auditory neuropathy or hearing pathway problems may be present. A child may seem to hear poorly even when some basic ear tests are normal, because the sound signal is not moving normally through the nerve pathway. [1]
- Constipation is common. The child may strain, pass hard stool, or have infrequent bowel movements. This can make feeding and comfort worse. [1]
- Peripheral neuropathy may develop. This means damage to nerves outside the brain and spinal cord. It can lead to weakness, reduced reflexes, sensory change, and poor sweating. [1][4]
- Acquired microcephaly or poor head growth can be seen in some children. This means the head grows more slowly than expected after birth, which may reflect brain growth problems. [7]
Diagnostic tests
Physical exam tests
- General physical examination is the first test. The doctor checks growth, body posture, muscle tone, alertness, hydration, and overall development. This helps the doctor see if there is a multisystem disorder. [1][4]
- Developmental examination checks how the child is learning motor, speech, social, and daily living skills. Delay in several areas is a major clue for this disease. [1]
- Neurologic examination looks for low muscle tone, abnormal reflexes, poor coordination, and unusual movements. This test is very important because a hyperkinetic movement disorder is one of the classic signs. [1]
- Eye examination checks for dry eyes, corneal damage, squint, optic nerve changes, and retinal disease. Many patients have reduced tears, so careful eye assessment matters. [1]
- Liver-focused physical examination looks for jaundice, enlarged liver, poor growth, or other signs that can match early liver involvement. It does not confirm the disease alone, but it supports suspicion. [1][2]
Manual tests
- Tear assessment, often done during an ophthalmology visit, checks whether the child makes enough tears. Low tear production is a very useful clinical clue in NGLY1 deficiency. [1][2]
- Detailed movement-disorder assessment is a bedside clinical test in which the doctor studies tremor, dystonia, chorea, athetoid movement, myoclonus, and balance. This helps separate NGLY1 deficiency from some other neurologic diseases. [1]
- Feeding and swallowing evaluation is used when the child has choking, slow feeding, poor mouth control, or weak oral movement. Specialists look at lip strength, tongue movement, bolus control, and swallow timing. [1]
- Speech and language evaluation checks communication level, language understanding, and speech production. This is important because speech delay and cognitive problems are common. [1]
- Clinical hearing assessment can be done with age-appropriate hearing observation and formal audiology support. Some children appear to respond poorly to sound because of auditory neuropathy. [1]
Lab and pathological tests
- Molecular genetic testing of NGLY1 is the main confirmatory test. The diagnosis is made when doctors find harmful variants in both copies of the NGLY1 gene. This may be done by gene panel, whole exome sequencing, whole genome sequencing, or targeted testing. [1][4]
- Whole exome sequencing is often very useful because many patients were first diagnosed this way. It is especially helpful when the disorder is not suspected early. [4][7]
- Serum AST and ALT liver enzyme tests are important supportive tests. These enzymes are often raised in the first years of life and may later return closer to normal. [1]
- Urine oligosaccharide testing can support diagnosis. In some patients, a characteristic abnormal oligosaccharide pattern has been found and used as a helpful biochemical clue. [7][9]
- GlcNAc-Asn or aspartylglucosamine biomarker testing in urine, plasma, or dried blood spots is a useful biochemical test. Research has shown this molecule accumulates when NGLY1 is not working properly. [10][11]
- Cerebrospinal fluid studies may show low total protein, low albumin, and low levels of some neurotransmitter-related markers in some patients. These are supportive findings, not the main confirmatory test. [1]
- Routine congenital disorder of glycosylation screening, such as transferrin glycoform testing, may be ordered during workup, but it is important to know that this usual screening does not reliably detect NGLY1-CDDG. This negative result can still be useful because it tells the doctor not to stop searching. [1]
Electrodiagnostic tests
- Auditory brainstem evoked response testing is very helpful for hearing-pathway problems. It may show abnormal or absent signal transmission through the auditory brainstem or eighth nerve, even when some other ear tests are normal. [1]
- Nerve conduction studies and electromyography help detect peripheral neuropathy. Many patients show an axonal sensorimotor polyneuropathy, and needle EMG may show neurogenic changes. [1]
- Electroencephalography, sleep study, and QSWEAT testing may be used based on symptoms. EEG is useful when seizures are suspected or to detect hidden seizure activity. A sleep study helps when snoring or apnea is suspected. QSWEAT testing may show absent sweating response and can support small nerve involvement. [1][12]
Imaging tests
- Brain MRI is an important imaging test. It may show delayed myelination in early childhood and later cerebral, and sometimes cerebellar, atrophy. These changes can become more clear as the disease progresses. [1]
- Brain magnetic resonance spectroscopy may show low N-acetylaspartate-related signals and higher choline or myo-inositol. This can support brain involvement, although it is not needed in every patient. [1]
- Radiologic orthopedic assessment and DXA scan may be used when scoliosis, bone health problems, or contractures are present. These tests help define body involvement and support overall care. [1]
Non-Pharmacological Treatments
1. Feeding therapy. Feeding therapy helps children who have chewing, swallowing, or oral-motor problems. The purpose is safer eating, better calorie intake, and less choking. The mechanism is repeated training of lips, tongue, jaw, posture, pacing, and texture tolerance so the child can swallow more effectively and reduce aspiration risk. [3]
2. Supplemental tube feeding. When growth is poor or swallowing is unsafe, doctors may use nasogastric or gastrostomy feeding. The purpose is to maintain energy, hydration, and weight gain. The mechanism is direct delivery of nutrition into the stomach or gut when oral intake is not enough. [4]
3. Physical therapy. Physical therapy is important for hypotonia, motor delay, and abnormal gait. The purpose is stronger movement, fewer contractures, better balance, and safer transfers. The mechanism is guided exercise, stretching, trunk control training, and mobility practice that support muscles and the nervous system. [5]
4. Occupational therapy. Occupational therapy helps with daily function such as sitting, grasping, dressing, play, and sensory adaptation. The purpose is greater independence and easier caregiving. The mechanism is task-based repetition, hand training, adaptive equipment, and environmental modification. [6]
5. Speech and communication therapy. Many children have delayed speech or limited expressive language. The purpose is to improve communication and reduce frustration. The mechanism is language stimulation, oral-motor work when appropriate, and augmentative communication systems such as picture boards or devices. [7]
6. Developmental pediatric care. A developmental pediatrician coordinates cognitive, motor, behavior, school, and family needs. The purpose is early intervention and structured long-term planning. The mechanism is regular developmental assessment and referral to therapies, equipment, and education services. [8]
7. Eye protection and ocular surface care. Because low tears are common, non-drug care includes humidification, eyelid hygiene, moisture chambers, and regular eye exams. The purpose is corneal protection and vision preservation. The mechanism is reducing dryness, surface irritation, and exposure injury. [9]
8. Cooling strategies for reduced sweating. Some patients do not sweat normally and can overheat. The purpose is to prevent heat injury, dehydration, and distress. The mechanism is good access to water, cool rooms, light clothing, fans, and cooling vests in hot climates. [10]
9. Nutrition planning with a metabolic or GI team. A personalized nutrition plan can help underweight children, constipation, reflux, or feeding intolerance. The purpose is stable growth and better digestion. The mechanism is adjusting calories, protein, texture, fiber, fluids, and meal schedule based on symptoms and growth trends. [11]
10. Swallow evaluation and aspiration prevention. A formal swallow study may be needed if coughing, choking, or recurrent chest infections occur. The purpose is safer feeding. The mechanism is identifying which food textures and positions reduce entry of food or liquid into the airway. [12]
11. Hearing support. Some children develop hearing problems. The purpose is better language development, social interaction, and learning. The mechanism is audiology testing followed by hearing aids or other interventions when needed. [13]
12. Seizure safety planning. Even before medicines are chosen, families need seizure first-aid training and emergency planning. The purpose is injury prevention and faster response. The mechanism is caregiver education about positioning, timing seizures, rescue plans, and when to seek emergency care. [14]
13. Scoliosis monitoring and bracing when needed. Weak muscles and motor problems can contribute to spinal curvature. The purpose is posture support and reduced pain or breathing compromise. The mechanism is regular orthopedic follow-up and bracing in selected cases. [15]
14. Sleep hygiene and sleep study support. Sleep problems and sleep apnea may occur. The purpose is better brain function, mood, and daytime energy. The mechanism is structured bedtime routine, sleep environment changes, and formal sleep evaluation when symptoms suggest apnea. [16]
15. Constipation prevention routines. Regular toileting, fluid goals, fiber choices, and movement can reduce constipation. The purpose is comfort and better feeding tolerance. The mechanism is improving bowel motility and stool softness without relying only on medicine. [17]
16. Liver monitoring. Liver enzyme elevation is common, especially early in life. The purpose is to catch complications and avoid unnecessary harm. The mechanism is repeated clinical review and blood testing over time, often with gastroenterology support. [18]
17. Mobility aids and adaptive equipment. Walkers, wheelchairs, supportive seating, ankle braces, and home modifications can reduce falls and caregiver strain. The purpose is safety and participation. The mechanism is mechanical support for weak or poorly controlled movement. [19]
18. Educational support and individualized learning plans. Many children have intellectual disability or major learning needs. The purpose is better development and social participation. The mechanism is special education planning, therapy integration, and tailored communication methods. [20]
19. Psychosocial and caregiver support. Rare diseases place large emotional and practical stress on families. The purpose is resilience, better adherence, and reduced burnout. The mechanism is counseling, respite care, social work, and support networks. [21]
20. Multidisciplinary follow-up. The best long-term care usually involves neurology, genetics, ophthalmology, GI, nutrition, rehabilitation, and primary care together. The purpose is coordinated treatment of a multisystem disorder. The mechanism is regular review of symptoms across body systems so care changes early when problems appear. [22]
Drug Treatments
There is no single standard drug regimen for NGLY1 deficiency. Medicines are chosen for symptoms, not for the gene defect itself. Doses below are general labeled examples or common clinical ranges, and the treating specialist must individualize them, especially in children and in liver disease. [23]
1. Levetiracetam. Often used for seizures. FDA labeling supports its use for certain seizure types. A common starting pediatric approach is specialist-guided divided dosing, increased slowly as needed. Purpose: seizure control. Mechanism: modulation of synaptic vesicle protein SV2A, which helps stabilize abnormal neuronal firing. Side effects can include sleepiness, irritability, dizziness, and reduced appetite. [24]
2. Clonazepam. Sometimes used for seizures or troublesome movement symptoms. It is a benzodiazepine. Purpose: reduce abnormal electrical activity and calm excessive motor output. Mechanism: increases GABA effect in the brain. Labeled tablet strengths include 0.5 mg, 1 mg, and 2 mg, but pediatric use must be carefully supervised. Side effects include sedation, drooling, poor coordination, and dependence risk. [25]
3. Diazepam. Used for acute seizure rescue, muscle spasm, or severe episodic hypertonia in selected patients. Purpose: rapid symptom control. Mechanism: GABA enhancement. Dosing depends on route and situation, so families need a neurologist’s emergency plan. Side effects include sleepiness, breathing suppression, and tolerance with repeated use. [26]
4. Valproic acid / valproate. Used in some seizure disorders, but with caution because NGLY1 patients may already have liver issues. Purpose: broader seizure suppression. Mechanism: increases inhibitory signaling and affects sodium channels and GABA pathways. Dosing is individualized by weight and serum response. Side effects include hepatotoxicity, tremor, vomiting, and thrombocytopenia. [27]
5. Baclofen. Used for spasticity, stiffness, or painful muscle tightness. Purpose: easier movement, less pain, and improved care activities. Mechanism: GABA-B receptor action in the spinal cord reduces muscle overactivity. Oral formulations include 5 mg, 10 mg, and 20 mg strengths in FDA labeling. Side effects include weakness, sleepiness, and withdrawal problems if stopped suddenly. [28]
6. Trihexyphenidyl. Sometimes used off-label for dystonia or abnormal movement. Purpose: reduce involuntary movement and improve comfort. Mechanism: anticholinergic action that changes motor signaling balance. Dosing is specialist-guided and increased slowly. Side effects include constipation, dry mouth, blurred vision, and confusion. [29]
7. Tetrabenazine. May be considered for severe choreiform or hyperkinetic movement symptoms in selected cases. Purpose: lower excessive involuntary movements. Mechanism: depletes presynaptic monoamines by inhibiting VMAT2. It carries major safety warnings, including depression and suicidality, so careful monitoring is needed. [30]
8. Omeprazole. Used when reflux or acid-related feeding discomfort is present. Purpose: reduce heartburn, reflux injury, and feeding distress. Mechanism: proton pump inhibition lowers stomach acid. Common labeled adult dosing includes 20 mg once daily for some indications, but pediatric use depends on age and weight. Side effects include diarrhea, headache, and long-term nutrient concerns. [31]
9. Polyethylene glycol 3350. Often used for constipation. Purpose: softer stool and easier bowel movements. Mechanism: osmotic water retention in the intestine. It is commonly used in bowel care plans, though pediatric dosing is individualized by clinicians. Side effects can include bloating, cramps, and loose stool. [32]
10. Glycopyrrolate. Sometimes used when severe drooling becomes a major care issue. Purpose: reduce saliva burden and skin irritation. Mechanism: anticholinergic reduction of gland secretion. FDA information supports oral solution use for severe drooling in some neurologic conditions. Side effects include constipation, urinary retention, overheating, and thicker secretions. [33]
11. Artificial tear products. Lubricating eye drops are a main symptom treatment for hypolacrima or alacrima. Purpose: protect the cornea and reduce pain. Mechanism: replace moisture on the ocular surface. Exact product and schedule depend on eye severity and ophthalmology advice. [34]
12. Bland ophthalmic ointments. Ointments are often used at night when the eyes remain dry for long periods. Purpose: longer eye surface protection during sleep. Mechanism: thicker lubrication layer reduces evaporation and exposure injury. Temporary blurred vision is common after application. [35]
13. Vitamin D. GeneReviews specifically mentions supplementation when deficiency is present. Purpose: support bone health and reduce deficiency complications in children with limited mobility or feeding problems. Mechanism: improves calcium absorption and skeletal mineralization. The right dose depends on lab results and age. [36]
14. Rescue antiseizure medication plan. Many neurologists prescribe a rescue medicine for prolonged seizures, often a benzodiazepine formulation. Purpose: stop a seizure emergency quickly. Mechanism: fast GABA enhancement. Caregivers need exact instructions on timing and when to call emergency services. [37]
15. Pain medicines such as acetaminophen. These may be used when discomfort from procedures, orthopedics, or illness occurs. Purpose: comfort and improved feeding or sleep. Mechanism: central pain reduction. Liver status matters when choosing dose and frequency. [38]
16. Antibiotics when infection occurs. They do not treat NGLY1 itself, but may be needed for aspiration pneumonia, ear infection, or skin infection. Purpose: treat confirmed bacterial illness. Mechanism: depends on the chosen antibiotic. Drug choice should follow the infection site and clinician judgment. [39]
17. Sleep-directed medicine when clinically needed. Some children with neurologic disorders need specialist-guided sleep treatment. Purpose: improve sleep quality and caregiver function. Mechanism varies by medicine. This is symptom-based care, not NGLY1-specific treatment. [40]
18. Bone health medicines in special cases. Children with immobility and deficiency may need targeted bone support after specialist review. Purpose: reduce fracture risk. Mechanism depends on the medicine chosen and should follow endocrine or bone assessment. [41]
19. Off-label movement-disorder medicines. Neurologists may trial selected drugs depending on whether dystonia, chorea, tremor, or stiffness is dominant. Purpose: symptom relief and easier daily care. Mechanism varies by agent. Evidence is individualized and limited because the disease is very rare. [42]
20. Investigational therapy. Gene therapy GS-100 is in human clinical testing, and a GlcNAc tear-production study has also been registered. These are not routine approved treatments yet. Purpose: potentially target the underlying disease. Mechanism: gene replacement or pathway-based intervention under research conditions only. [43]
Dietary or Molecular Supplements
1. Vitamin D. Helpful when deficiency is documented, especially in children with poor intake or limited mobility. It supports bone mineralization and calcium handling. [44]
2. Calcium. Used when intake is poor or bone health is at risk. It helps bone strength and works with vitamin D. [45]
3. Protein-rich nutrition formulas. Useful when growth is poor and oral intake is limited. They support weight gain and tissue repair. [46]
4. High-calorie modular supplements. These are added when regular meals do not meet energy needs. They improve total calorie delivery without large food volume. [47]
5. Fiber support. Helpful when constipation is present and intake is low. It can improve stool pattern when paired with enough fluid. [48]
6. Oral rehydration support. Useful during heat stress, illness, or feeding difficulty. It helps maintain fluid and electrolyte balance. [49]
7. Iron only if deficiency is proven. It may help anemia or low iron stores, but should not be given blindly. [50]
8. Multivitamin support. This may be useful when diet is restricted or tube feeding is incomplete. It helps prevent general micronutrient gaps. [51]
9. Omega-3 nutritional support. Sometimes used for general nutrition, although direct NGLY1 evidence is limited. It is supportive, not disease-specific. [52]
10. GlcNAc research therapy. N-acetylglucosamine is being studied, especially regarding tear production and biomarkers, but it is still investigational rather than standard care. [53]
Immunity, Regenerative, or Stem-Cell / Advanced Therapies
At present, there are no proven immune booster drugs, stem-cell drugs, or regenerative medicines approved for routine NGLY1 deficiency care. The advanced-therapy field is still experimental. [54]
1. GS-100 gene therapy is the most visible human investigational program. It aims to deliver a working copy of the NGLY1 gene. [55]
2. Preclinical enzyme replacement therapy has been discussed in GeneReviews, but it is not standard care yet. [56]
3. ENGase inhibitor strategies are under preclinical study as a possible pathway-based therapy. [57]
4. Large-scale repurposing screens are exploring whether existing drugs may help some cellular defects, but these findings are not yet routine treatment. [58]
5. Biomarker-guided metabolic therapy is under study to track disease activity and possible response to GlcNAc-related approaches. [59]
6. Experimental animal-model gene replacement has shown benefit in mice, but animal success does not guarantee human benefit. [60]
Surgeries or Procedures
1. Gastrostomy tube placement may be done for long-term feeding failure or unsafe swallowing. It is done to improve nutrition and reduce aspiration risk. [61]
2. Orthopedic surgery may be considered for severe scoliosis or contractures when bracing and therapy are not enough. It is done to improve posture, pain, and function. [62]
3. Intrathecal baclofen pump placement can be considered in selected severe spasticity cases. It is done to deliver baclofen directly when oral therapy is not enough or causes too many side effects. [63]
4. Airway or sleep-related procedures may be needed when severe sleep apnea or airway problems are proven. The exact procedure depends on the cause. [64]
5. Eye procedures such as protective interventions may be needed if serious corneal damage develops from severe dryness. The reason is to protect vision and the eye surface. [65]
Prevention Tips
Keep the child cool and well hydrated. Protect the eyes every day. Monitor growth closely. Treat constipation early. Follow seizure plans exactly. Keep regular liver and neurology follow-up. Use physical and occupational therapy early. Prevent falls with equipment when needed. Keep vaccines and infection prevention up to date through the child’s doctor. Ask for rapid review if feeding, breathing, or alertness worsens. [66]
When to See a Doctor
See a doctor urgently for a new seizure, longer seizure than usual, breathing trouble, repeated choking, dehydration, fever with poor intake, unusual sleepiness, eye redness or pain, loss of vision, severe constipation, persistent vomiting, jaundice, or sudden loss of skills. Regular follow-up is also needed even when the child seems stable because NGLY1 deficiency affects many organs over time. [67]
What to Eat and What to Avoid
Choose calorie-dense, texture-safe foods; adequate protein; enough fluid; fiber when tolerated; and nutrition formulas if oral intake is poor. Soft foods may help children with chewing problems. Avoid foods that trigger choking, very dry foods if swallowing is weak, dehydration, overheating, and unplanned restrictive diets. If reflux is present, avoid individual trigger foods and large late meals. Feeding plans should be personalized with a dietitian or GI team. [68]
FAQs
What causes this disease? Harmful changes in both copies of the NGLY1 gene. [69]
Is it inherited? Yes, usually autosomal recessive. [70]
Is there a cure? No approved cure yet. [71]
Can it affect the brain? Yes, very commonly. [72]
Can it cause seizures? Yes, in many patients. [73]
Why are the eyes dry? Reduced or absent tear production is a classic feature. [74]
Can liver tests be abnormal? Yes, especially in childhood. [75]
Is speech delay common? Yes. [76]
Do all patients look the same clinically? No, severity varies widely. [77]
Is tube feeding common? It may be needed when oral feeding is unsafe or inadequate. [78]
Can physical therapy help? Yes, it supports function even though it does not cure the disease. [79]
Are stem cells proven? No. [80]
Is gene therapy being studied? Yes. [81]
Can adults have this disease? Yes, but it usually begins in infancy or childhood. [82]
What is the main treatment approach today? Supportive multidisciplinary care. [83]
Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.
The article is written by Team RxHarun and reviewed by the Rx Editorial Board Members
Last Updated: March 31, 2025.
