AMYOTROPHIC LATERAL SCLEROSIS 2, JUVENILE

General Information (adopted from Orphanet):

Synonyms, Signs: ALS, JUVENILE
ALS2
ALSJ
Number of Symptoms 19
OrphanetNr:
OMIM Id: 205100
ICD-10:
UMLs:
MeSH:
MedDRA:
Snomed:

Prevalence, inheritance and age of onset:

Prevalence: No data available.
Inheritance: Autosomal recessive inheritance
[Omim]
Age of onset:

Disease classification (adopted from Orphanet):

Parent Diseases: No data available.

Symptom Information: Sort by abundance 

1
(HPO:0000183) Difficulty in tongue movements 4 / 7739
2
(HPO:0002491) Spasticity of facial muscles 3 / 7739
3
(HPO:0002307) Drooling 43 / 7739
4
(HPO:0002015) Dysphagia 301 / 7739
5
(HPO:0002464) Spastic dysarthria 5 / 7739
6
(HPO:0002200) Pseudobulbar signs 15 / 7739
7
(HPO:0002127) Abnormal upper motor neuron morphology 15 / 7739
8
(HPO:0002064) Spastic gait 46 / 7739
9
(HPO:0002366) Abnormal lower motor neuron morphology 12 / 7739
10
(HPO:0001347) Hyperreflexia 363 / 7739
11
(HPO:0001285) Spastic tetraparesis 29 / 7739
12
(HPO:0002501) Spasticity of pharyngeal muscles 3 / 7739
13
(HPO:0003487) Babinski sign 179 / 7739
14
(HPO:0009130) Hand muscle atrophy 11 / 7739
15
(HPO:0003693) Distal amyotrophy 118 / 7739
16
(OMIM) Spasticity of lower and upper limbs 3 / 7739
17
(OMIM) Muscle biopsy showed neurogenic atrophy 3 / 7739
18
(OMIM) No sensory abnormalities 5 / 7739
19
(OMIM) EMG shows evidence of denervation 1 / 7739

Associated genes:

ClinVar (via SNiPA)

Gene symbol Variation Clinical significance Reference

Additional Information:

Clinical Description OMIM In an Amish isolate, Gragg et al. (1971) observed 2 brothers with onset in the first decade of the ALS symptom complex: distal muscular atrophy, increased deep tendon reflexes, spasticity, and fasciculations. Refsum and Skillicon (1954) described the ...
Molecular genetics OMIM In affected members of the Tunisian family reported by Ben Hamida et al. (1990) and Hentati et al. (1992, 1994), Yang et al. (2001) and Hadano et al. (2001) identified a homozygous mutation in the ALS2 gene (606352.0001). ...
Diagnosis GeneReviews ALS2-related disorders involve retrograde degeneration of the upper motor neurons of the pyramidal tracts and comprise a clinical continuum from (1) infantile ascending hereditary spastic paraplegia (IAHSP)* to (2) juvenile forms without lower motor neuron involvement (juvenile primary lateral sclerosis or JPLS)* to (3) forms with lower motor neuron involvement (autosomal recessive juvenile amyotrophic lateral sclerosis or JALS). The different phenotypes reported in the literature are summarized....
Clinical Description GeneReviews Mutations in ALS2 are responsible for a retrograde degeneration of the upper motor neurons of the pyramidal tracts, leading to a clinical continuum from infantile ascending hereditary spastic paraplegia to juvenile forms without lower motor neuron involvement (juvenile primary lateral sclerosis) or with lower motor neuron involvement (autosomal recessive juvenile amyotrophic lateral sclerosis)....
Genotype-Phenotype Correlations GeneReviews So far, the IAHSP and JPLS phenotypes are uniform among individuals from nine families with truncating ALS2 mutations. Table 3 (pdf) summarizes the 15 mutations from 16 families classified as IAHSP or JPLS and from the sibs of the three families classified as JALS. Sixteen families with mutations in ALS2 show a uniform clinical course (except for existence of lower motor neuron involvement in some with JALS), while the Tunisian family with juvenile amyotrophic lateral sclerosis has a relatively milder phenotype....
Differential Diagnosis GeneReviews See Hereditary Spastic Paraplegia Overview. ...
Management GeneReviews To establish the extent of disease in an individual diagnosed with an ALS2-related disorder, the following evaluations are recommended:...
Molecular genetics GeneReviews Information in the Molecular Genetics and OMIM tables may differ from that elsewhere in the GeneReview: tables may contain more recent information. —ED....