raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:98914

Presynaptic congenital myasthenic syndrome

Type
Etiological subtype
Group
Subtype of disorder
Inheritance
Autosomal dominant, Autosomal recessive
Age of onset
Infancy, Neonatal
Status
active

This disease is described under Congenital myasthenic syndrome

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPresynaptic congenital myasthenic syndrome
frSyndrome myasthénique congénital pré-synaptique
dePräsynaptisches kongenitales myasthenes Syndrom
esSíndromes miasténicos congénitos presinápticos
itSindrome miastenica congenita presinaptica
nlPresynaptisch congenitaal myastheen syndroom
ptSíndromes miasténicos, congénitos, pré-sinápticos
plWrodzone presynaptyczne zespoły miasteniczne
csPresynaptické vrozené myastenické syndromy
ukПресинаптичні вроджені міастенічні синдроми
zh突触前性先天性肌无力综合征
trPresinaptik doğumsal miyastenik sendromlar
2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM254210BTNTvalidated
OMIM615120BTNTvalidated
OMIM616040BTNTvalidated
OMIM616224BTNTvalidated
OMIM616330BTNTvalidated
OMIM617143BTNTvalidated
OMIM617239BTNTvalidated
OMIM618198BTNTvalidated
OMIM618323BTNTvalidated
OMIM619461BTNTvalidated
OMIM621455BTNTvalidated
ICD-10G70.2NTBTattributedvalidated
ICD-118C61NTBTindexvalidated
UMLSC0751884Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (2):

Children (4):

4

Genes

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

0 records

No prevalence record in this release.

6

HPO phenotypes

68 annotations · validated 2018-06-04
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0002015Dysphagia
HP:0003473Fatigable weakness
HP:0011968Feeding difficulties
HP:0004661Frontalis muscle weakness
HP:0004889Intermittent episodes of respiratory insufficiency due to muscle weakness
HP:0000467Neck muscle weakness
HP:0002033Poor suck
HP:0003701Proximal muscle weakness
HP:0000508Ptosis
HP:0002882Sudden episodic apnea
Frequent (79-30%)
HP:0002872Apneic episodes precipitated by illness, fatigue, stress
HP:0002804Arthrogryposis multiplex congenita
HP:0001251Ataxia
HP:0001283Bulbar palsy
HP:0010536Central sleep apnea
HP:0030842Choking episodes
HP:0000961Cyanosis
HP:0001558Decreased fetal movement
HP:0100285EMG: impaired neuromuscular transmission
HP:0003388Easy fatigability
HP:0004885Episodic respiratory distress
HP:0001288Gait disturbance
HP:0003324Generalized muscle weakness
HP:0001611Hypernasal speech
HP:0001249Intellectual disability
HP:0100295Muscle fiber atrophy
HP:0011469Nasal regurgitation
HP:0000602Ophthalmoplegia
HP:0002205Recurrent respiratory infections
HP:0008443Spinal deformities
Occasional (29-5%)
HP:0001284Areflexia
HP:0003693Distal amyotrophy
HP:0009053Distal lower limb muscle weakness
HP:0001618Dysphonia
HP:0003458EMG: myopathic abnormalities
HP:0000218High palate
HP:0001252Hypotonia
HP:0002751Kyphoscoliosis
HP:0003325Limb-girdle muscle weakness
HP:0000276Long face
HP:0001270Motor delay
HP:0012801Narrow jaw
HP:0001761Pes cavus
HP:0002421Poor head control
HP:0001250Seizure
HP:0003306Spinal rigidity
HP:0010307Stridor
HP:0030051Tip-toe gait
HP:0002515Waddling gait
HP:0001612Weak cry
Very rare (<4-1%)
HP:0001374Congenital hip dislocation
HP:0000651Diplopia
HP:0002392EEG with polyspike wave complexes
HP:0000565Esotropia
HP:0002020Gastroesophageal reflux
HP:0001265Hyporeflexia
HP:0001382Joint hypermobility
HP:0000369Low-set ears
HP:0000308Microretrognathia
HP:0007178Motor polyneuropathy
HP:0000639Nystagmus
HP:0002870Obstructive sleep apnea
HP:0000768Pectus carinatum
HP:0001561Polyhydramnios
HP:0005943Respiratory arrest
HP:0000407Sensorineural hearing impairment
HP:0025401Staring gaze
Excluded (0%)
HP:0030208Acetylcholine receptor antibody positivity

Run the differential on the 10 obligate / very frequent terms

Annotation source: 22353287[PMID]_15145336[PMID]_18707767[PMID]_25381298[PMID]_11172068[PMID]_25192047[PMID]_19631309[PMID]_26626625[PMID]_27569547[PMID]_27590285[PMID]

7

Sources for this card