| Inbound Relationships |
Type |
Active |
Source |
Characteristic |
Refinability |
Group |
| [X]Severe mental retardation with the statement of no, or minimal, impairment of behavior |
Is a |
False |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| [X]Severe mental retardation, significant impairment of behavior requiring attention or treatment |
Is a |
False |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| [X]Severe mental retardation, other impairments of behavior |
Is a |
False |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| [X]Severe mental retardation without mention of impairment of behavior |
Is a |
False |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| Profound intellectual disability (disorder) |
Is a |
False |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare, genetic, syndromic intellectual disability characterized by severe intellectual disability, non-inherited, progressive, post-natal microcephaly, hypotonia, hyperkinesia, absence of speech, strabismus, and midline stereotypic hand movements (e.g. hand washing/rubbing). Additional features include developmental delay, seizures and behavioral disturbances, such as self-injury and unexplained crying episodes. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare complex hereditary spastic paraplegia characterized by an early onset hypotonia that progresses to spasticity, global developmental delay, severe intellectual disability and speech impairment, microcephaly, short stature and dysmorphic features. Patients often become non-ambulatory, and some develop seizures and stereotypic laughter. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare, genetic, syndromic intellectual disability disorder characterized by intellectual disability, significant motor delay, severe speech impairment, early-onset truncal hypotonia with progressive distal hypertonia/spasticity, microcephaly, and behavioral anomalies (autistic features, aggression or auto-aggressive behavior, sleep disturbances). Variable facial dysmorphism includes broad nasal tip with small alae nasi, long and/or flat philtrum, thin upper lip vermillion. Visual impairment (strabismus, hyperopia, myopia) is commonly associated. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by profound intellectual disability, hypotonia, coarse facial features, strabismus and impaired visual fixation, hypermobility of interphalangeal joints, contractures in the elbow joints, and pes planovalgus. Seizures and episodes of aggressive behavior during sleep have also been reported. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare, genetic, syndromic intellectual disability disorder characterized by severe psychomotor development delay (without development of primary motor abilities and speech) and severe intellectual disability, associated with marfanoid habitus, joint laxity, bilateral hip luxation, hypotonia, scoliosis, and characteristic facial dysmorphism (i.e. high nasal bridge, sharp nose, short philtrum, large mouth, full lips and maxillary hypoplasia). There have been no further descriptions in the literature since 1994. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare genetic neurological disorder characterized by congenital microcephaly, severe intellectual disability, hypertonia at birth lessening with age, ataxia, and specific dysmorphic facial features including hirsutism, low anterior hairline and bitemporal narrowing, arched, thick, and medially sparse eyebrows, long eyelashes, lateral upper eyelids swelling and a skin fold partially covering the inferior eyelids, low-set posteriorly rotated protruding ears, anteverted nares, and a full lower lip. Brain imaging shows partial to almost complete agenesis of the corpus callosum and variable degrees of cerebellar hypoplasia. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare, genetic, primary lipodystrophy syndrome characterized by severe developmental delay and intellectual disability, hypertonia, hyperreflexia, microcephaly, tightly adherent skin, an aged appearance, severe generalized lipodystrophy, and distinct facial dysmorphism which includes large prominent eyes, narrow nasal bridge, tented upper lip vermilion, an open mouth, and high-arched palate. Laboratory analysis of serum and urine are normal. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare organic aciduria characterized by early onset of global developmental delay with severe intellectual disability, seizures, and 3-methylglutaconic aciduria. Additional features are hypotonia, hyperactivity and aggressive behavior, optic atrophy, or spasticity. Brain imaging may show generalized cerebral atrophy and white matter abnormalities. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by the association of severe intellectual disability, strabismus, and anterior maxillary protrusion with vertical maxillary excess, open bite, and prominent crowded teeth. Mild cochlear hearing loss has been reported in addition. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare disorder of plasmalogen biosynthesis characterized by syndromic severe intellectual disability with congenital cataracts, early-onset epilepsy, microcephaly, global developmental delay, growth retardation and short stature, and spastic quadriparesis. Dysmorphic facial features may be present, including high-arched eyebrows, flattened nasal root, hypertelorism, and long and smooth philtrum. Rhizomelia is not part of the syndrome. Cerebellar atrophy, white matter abnormalities, and Dandy-Walker malformation have been described on brain imaging. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| Congenital insensitivity to pain with severe intellectual disability is a rare autosomal recessive hereditary sensory and autonomic neuropathy characterized by the complete absence of pain perception from birth, an unresponsiveness to soft touch, severe non-progressive cognitive delay, and normal motor movement/behavior and strength. Affected cases retained hot and cold perception. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by developmental delay, moderate to severe intellectual disability, dysmorphic features including craniosynostosis, micro-/retrognathia, cleft palate, and brachydactyly, and short stature. Seizures, skeletal anomalies (such as arthrogryposis, gracile bones, and pathological fractures), and renal abnormalities have also been described. Cerebral MRI may show periventricular white matter changes and ventriculomegaly. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare genetic syndrome with a central nervous system malformation as a major feature, characterized by cortical malformations including posterior predominant lissencephaly and diffuse pachygyria, as well as midline crossing defects, thin corpus callosum, dysplastic hippocampi, narrowing of the brainstem with small pons and midbrain, widening of the medulla, and small cerebellum. Clinically, patients present global developmental delay, severe intellectual disability with poor or absent speech, axial hypotonia, and early-onset seizures, among others. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare genetic neurodevelopmental disorder characterised by global developmental delay, severe intellectual disability and absence of expressive language. Muscular hypotonia, seizures, autistic behaviour and stereotypic movements are common. The disorder is caused by homozygous or compound heterozygous intragenic deletions or truncating variants in the NRXN1 gene (2p16.3). NRXN1 belongs to the evolutionarily conserved family of neurexins, presynaptic transmembrane proteins and has an important role in synaptic function. Inheritance is autosomal recessive. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A form of pontocerebellar hypoplasia characterised by severe, progressive microcephaly and severe global developmental delay apparent from birth, severe intellectual disability with lack of social interactions and absence of speech, and pontocerebellar hypoplasia and complete or partial agenesis of the corpus callosum on brain imaging. In addition, affected individuals often present hypotonia, spastic tetraplegia, and early-onset seizures. Chronic anaemia and thrombocytopenia have also been reported. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare genetic neurodegenerative disorder characterized by congenital microphthalmia, sunken eyes, blindness, microcephaly, severe intellectual disability, progressive spasticity, and seizures. Psychomotor development is normal in the first 6-8 months of life and thereafter declines rapidly and continuously. Brain MRI reveals progressive and extensive degenerative changes, especially cortex, cerebellum, brainstem, and corpus callosum atrophy, with complete loss of cerebral white matter. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| X-linked intellectual disability-limb spasticity-retinal dystrophy-diabetes insipidus syndrome is a rare genetic neurometabolic disease characterized by severe intellectual disability, spastic quadriparesis, Leber congenital amaurosis and diabetes insipidus. Additional manifestations include facial dysmorphy (dolichocephalic skull, hypertelorism, deep-set eyes, hypoplastic nares, low-set ears), short stature, truncal hypotonia and axial hypertonia. Brain anomalies (e.g. thin corpus callosum with lack of isthmus and tapered splenium, hypoplasia or atrophy of the optic chiasm, prominent lateral ventricles, diminished white matter), described on magnetic resonance imaging, have been reported. High prenatal alpha-fetoprotein and intrauterine growth restriction is observed in routine pregnancy examination. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare multiple congenital anomalies/dysmorphic syndrome characterized by developmental delay, severe intellectual disability, severe speech and communication problems and distinctive dysmorphic faces (high hairline, thin eyebrows, hypertelorism, dysmorphic ears, broad nasal bridge and tip, and narrow jaw). Height is not affected. Some patients may also present autistic behaviors. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare multiple congenital anomalies/dysmorphic syndrome characterized by severe intellectual disability, global developmental delay with no speech (some patients may have limited speech), inability or difficulty to walk, microcephaly, and early-onset cataract. Additional clinical features may include hypotonia, spasticity, endocrine/metabolic diseases and immunodeficiency with lymphopenia. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
| A rare syndromic intellectual disability without congenital anomalies/specific dysmorphic phenotype characterised by delayed psychomotor development, severe intellectual disability, delayed or absent speech development, hypotonia, ataxic gait and feeding difficulties. Clinical symptoms are evident from early infancy. Majority of the patients also present with behavioural abnormalities (including autistic features, aggressive behaviour, low frustration tolerance, and stereotypies such as hand-flapping). Additional clinical features may include inability to walk, seizures, hearing loss, sleep abnormalities, joint hyperlaxity. Nonspecific dysmorphic facial features (small head, strabismus, epicanthal folds, synophrys, high palate, low-set ears, orofacial hypotonia, full eyelids, and eversion of the lower lip) may also be present. |
Is a |
True |
Severe intellectual disability (disorder) |
Inferred relationship |
Some |
|
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