Intellectual disability, and Difficulty walking

Autosomal recessive spastic paraplegia type 60 is a rare, complex hereditary spastic paraplegia disorder characterized by infantile onset of progressive lower limb spasticity, inability to walk, hypertonia and impaired vibration sense at ankles, with complicating signs including sensory impairment, nystagmus, motor axonal neuropathy and mild intellectual disability.

AUTOSOMAL RECESSIVE SPASTIC PARAPLEGIA TYPE 60 Is also known as spg60

• Nystagmus
• Intellectual disability, mild
• Difficulty walking
• Spastic paraplegia
• Lower limb spasticity

SOURCES: ORPHANET MENDELIAN

Autosomal recessive spastic paraplegia type 67 is an extremely rare, complex hereditary spastic paraplegia characterized by an infancy or childhood onset of global developmental delay and progressive spasticity with tremor in the distal limbs, increased deep tendon reflexes and extensor plantar responses, which may be associated with mild intellectual disability. Additional features include muscle wasting and cerebellar abnormalities.

AUTOSOMAL RECESSIVE SPASTIC PARAPLEGIA TYPE 67 Is also known as spg67

• Global developmental delay
• Hyperreflexia
• Intellectual disability, mild
• Babinski sign
• Agenesis of corpus callosum

SOURCES: ORPHANET MENDELIAN

Familial dyskinesia and facial myokymia is a rare paroxysmal movement disorder, with childhood or adolescent onset, characterized by paroxysmal choreiform, dystonic, and myoclonic movements involving the limbs (mostly distal upper limbs), neck and/or face, which can progressively increase in both frequency and severity until they become nearly constant. Patients may also present with delayed motor milestones, perioral and periorbital dyskinesias, dysarthria, hypotonia, and weakness.

FAMILIAL DYSKINESIA AND FACIAL MYOKYMIA Is also known as fdfm

• Intellectual disability
• Generalized hypotonia
• Motor delay
• Hyperreflexia
• Dysarthria

SOURCES: ORPHANET MESH OMIM MENDELIAN

Autosomal recessive spastic paraplegia type 66 is a rare, complex hereditary spastic paraplegia disorder characterized by infantile onset of progressive lower limb spasticity, severe gait disturbances leading to a non-ambulatory state, absent deep tendon reflexes and amyotrophy. Additional signs include severe sensorimotor neuropathy, pes equinovarus and mild intellectual disability. Cerebellar and corpus callosum hypoplasia, as well as colpocephaly, are observed on neuroimaging.

AUTOSOMAL RECESSIVE SPASTIC PARAPLEGIA TYPE 66 Is also known as spg66

• Intellectual disability
• Talipes equinovarus
• Hypoplasia of the corpus callosum
• Areflexia
• Cerebellar hypoplasia

SOURCES: ORPHANET MENDELIAN

Autosomal recessive limb-girdle muscular dystrophy type 2P (LGMD2P) is a form of limb-girdle muscular dystrophy characterized by slowly-progressive, mainly proximal, muscle weakness presenting in early childhood (with difficulties walking and climbing stairs) and mild to severe intellectual disability. Additional manifestations reported include microcephaly, mild increase in thigh or calf muscles, and contractures of the ankles.

AUTOSOMAL RECESSIVE LIMB-GIRDLE MUSCULAR DYSTROPHY TYPE 2P Is also known as muscular dystrophy, limb-girdle, type 2p|muscular dystrophy, limb-girdle, autosomal recessive 16|muscular dystrophy-dystroglycanopathy, limb-girdle, dag1-related|lgmdr16|lgmd2p

• Intellectual disability
• Global developmental delay
• Muscle weakness
• Flexion contracture
• Delayed speech and language development

SOURCES: ORPHANET OMIM MENDELIAN

Autosomal recessive spastic paraplegia type 32 (SPG32) is a rare, complex type of hereditary spastic paraplegia characterized by a slowly progressive spastic paraplegia (with walking difficulties appearing at onset at 6-7 years of age) associated with mild intellectual disability. Brain imaging reveals thin corpus callosum, cortical and cerebellar atrophy, and pontine dysraphia. The SPG32 phenotype has been mapped to a locus on chromosome 14q12-q21.

AUTOSOMAL RECESSIVE SPASTIC PARAPLEGIA TYPE 32 Is also known as spg32

• Intellectual disability
• Spasticity
• Peripheral neuropathy
• Hyperreflexia
• Hypoplasia of the corpus callosum

SOURCES: MESH ORPHANET OMIM MENDELIAN

Myofibrillar myopathy-7 is an autosomal recessive muscle disorder characterized by early childhood onset of slowly progressive muscle weakness primary affecting the lower limbs and associated with joint contractures (summary by Straussberg et al., 2016).For a general phenotypic description and a discussion of genetic heterogeneity of myofibrillar myopathy, see MFM1 (OMIM ).

• Intellectual disability
• Muscle weakness
• Flexion contracture
• Skeletal muscle atrophy
• Talipes equinovarus

SOURCES: OMIM ORPHANET MENDELIAN

Spinocerebellar ataxia type 35 (SCA35) is a subtype of autosomal dominant cerebellar ataxia type 1 (ADCA type 1; see this term) characterized by the adult-onset of progressive gait and limb ataxia, dysarthria, ocular dysmetria, intention tremor, hyperreflexia and spasmodic torticollis.

SPINOCEREBELLAR ATAXIA TYPE 35 Is also known as sca35

• Intellectual disability
• Ataxia
• Nystagmus
• Delayed speech and language development
• Peripheral neuropathy

SOURCES: ORPHANET OMIM MENDELIAN

IECEE2 is a neurodevelopmental disorder characterized in most patients by onset of seizures in infancy or childhood and associated with global developmental delay and variable intellectual disability. The seizure type and severity varies, and seizures may be intractable in some patients. Some patients are severely affected, unable to walk or speak, whereas others show some development. Additional neurologic features, including cortical blindness, dystonia, and spasticity, may occur. Mutations occur de novo (summary by Hamdan et al., 2017).For a discussion of genetic heterogeneity of IECEE, see IECEE1 (OMIM ).

• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia
• Microcephaly

SOURCES: OMIM MENDELIAN

Autosomal recessive congenital cerebellar ataxia due to GRID2 deficiency is a rare, genetic, slowly progressive neurodegenerative disease resulting from GRID2 deficiency characterized by motor, speech and cognitive delay, hypotonia, truncal and appendicular ataxia, and eye movement abnormalities (tonic upgaze, nystagmus, oculomotor apraxia). Intention tremor may also be associated. Brain imaging reveals progressive cerebellar atrophy with cerebellar flocculus particularly affected.

AUTOSOMAL RECESSIVE CONGENITAL CEREBELLAR ATAXIA DUE TO GRID2 DEFICIENCY Is also known as autosomal recessive congenital cerebellar ataxia due to ionotropic glutamate receptor delta-2 subunit deficiency|scar18

• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia
• Ataxia

SOURCES: ORPHANET OMIM MENDELIAN