Spinal muscular atrophy with lower extremity predominance 2B

Spinal muscular atrophy with lower extremity predominance 2B
Other namesLower extremity-predominant spinal muscular atrophy type 2B, SMALED2B
Spinal muscular atrophy with lower extremity predominance 2B is inherited in an autosomal dominant manner.
SpecialtyNeurology
SymptomsGeneralised severe hypotonia at birth
Usual onsetInfancy
DurationLifetime
CausesMutations in BICD2 gene
Diagnostic methodMolecular test
PrognosisLife limiting

Spinal muscular atrophy with lower extremity predominance 2B (SMALED2B) is a rare neuromuscular disorder characterised by generalised muscle weakness.

Indications

Decreased foetal movement is apparent already before birth. The child is born with a generalised muscle weakness (hypotonia) and contractures resembling arthrogryposis multiplex congenita, respiratory insufficiency, and sometimes facial deformations.[1][2] The disorder is frequently fatal in early childhood.[1]

Cause

The disease is caused by a mutation in the BICD2 gene and is passed on in an autosomal dominant manner.[1] There is no known cure to SMALED2B.

See also

  • Spinal muscular atrophies
  • Spinal muscular atrophy with lower extremity predominance 1
  • Spinal muscular atrophy with lower extremity predominance 2A

References

  1. ^ a b c Online Mendelian Inheritance in Man (OMIM): 618291
  2. ^ Koboldt, Daniel C.; Kastury, Rama D.; Waldrop, Megan A.; Kelly, Benjamin J.; Mosher, Theresa Mihalic; McLaughlin, Heather; Corsmeier, Don; Slaughter, Jonathan L.; Flanigan, Kevin M.; McBride, Kim L.; Mehta, Lakshmi (2018). "In-frame de novo mutation in BICD2 in two patients with muscular atrophy and arthrogryposis". Cold Spring Harbor Molecular Case Studies. 4 (5): a003160. doi:10.1101/mcs.a003160. ISSN 2373-2865. PMC 6169820. PMID 30054298.
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