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Disease Profile

Neurodevelopmental disorder with severe motor impairment and absent language

Prevalence
Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.

Unknown

Age of onset

#N/A

ICD-10

#N/A

Inheritance

Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease

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Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype

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X-linked
dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.

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X-linked
recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder

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Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.

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Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.

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Not applicable

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Other names (AKA)

NEDMIAL; DHX30-Related neurodevelopmental disorder; DHX30-Related disorder

Summary

Neurodevelopmental disorder with severe motor impairment and absent language (NEDMIAL) is a rare condition caused by a change in the DexH-box helicase 30 (DHX30) gene. The most common signs and symptoms are severe intellectual, speech and walking impairment. Infants with the disorder have low muscle tone, delayed mental and motor skills, and problems feeding. Many children with the disorder are non-verbal, although some use a few words. Walking is difficult for children with this rare disorder. Children who walk independently have an unsteady gait. Additional symptoms vary, but may include autistic features, behavior challenges, sleep disorder, seizures, hyper-flexible joints, involuntary movements, distinctive facial features, and strabismus.[1][2]

Symptoms

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

Medical Terms Other Names
Learn More:
HPO ID
1%-4% of people have these symptoms
Seizure
0001250
Percent of people who have these symptoms is not available through HPO
Abnormal facial shape
Unusual facial appearance
0001999
Absent speech
Absent speech development
Lack of language development
Lack of speech
No speech development
No speech or language development
Nonverbal

[ more ]

0001344
Ataxia
0001251
Autosomal dominant inheritance
0000006
Bruxism
Teeth grinding
0003763
Cerebellar atrophy
Degeneration of cerebellum
0001272
Cerebral atrophy
Degeneration of cerebrum
0002059
Chorea
0002072
Delayed ability to walk
0031936
Delayed myelination
0012448
Dystonia
0001332
Epicanthus
Eye folds
Prominent eye folds

[ more ]

0000286
Everted lower lip vermilion
Drooping lower lip
Outward turned lower lip

[ more ]

0000232
Feeding difficulties
Feeding problems
Poor feeding

[ more ]

0011968
Generalized hypotonia
Decreased muscle tone
Low muscle tone

[ more ]

0001290
Global developmental delay
0001263
High palate
Elevated palate
Increased palatal height

[ more ]

0000218
Inability to walk
0002540
Infantile onset
Onset in first year of life
Onset in infancy

[ more ]

0003593
Intellectual disability
Mental deficiency
Mental retardation
Mental retardation, nonspecific
Mental-retardation

[ more ]

0001249
Joint hypermobility
Double-Jointed
Flexible joints
Increased mobility of joints

[ more ]

0001382
Low-set ears
Low set ears
Lowset ears

[ more ]

0000369
Microcephaly
Abnormally small skull
Decreased circumference of cranium
Decreased size of skull
Reduced head circumference
Small head circumference

[ more ]

0000252
Pes planus
Flat feet
Flat foot

[ more ]

0001763
Strabismus
Cross-eyed
Squint
Squint eyes

[ more ]

0000486
Synophrys
Monobrow
Unibrow

[ more ]

0000664
Ventriculomegaly
0002119

Organizations

Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Social Networking Websites

Learn more

These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

In-Depth Information

  • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 

Selected Full-Text Journal Articles

References

  1. Neurodevelopmental disorder with severe motor impairment and absent language; NEDMIAL. OMIM. December 9, 2017; https://www.omim.org/entry/617804. Accessed 9/12/2018.
  2. Lessel, D., Schob, C., Kury, S., Reijnders, M. R. F., Harel, T., Eldomery, M. K., Coban-Akdemir, Z., Denecke, J., Edvardson, S., Colin, E., Stegmann, A. P. A., Gerkes, E. H., and 32 others.. De novo missense mutations in DHX30 impair global translation and cause a neurodevelopmental disorder. Am. J. Hum. Genet. 2017; 101:716-724. Accessed 9/12/2018.