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Deafness with labyrinthine aplasia, microtia, and microdontia

Synonym(s) LAMM syndrome
Microdontia-type I microtia-deafness syndrome
Prevalence <1 / 1 000 000
Inheritance Autosomal recessive
Age of onset Infancy
  • Q16.5
  • C2932664
  • C548011
MedDRA -


Disease definition

Deafness with labyrinthine aplasia, microtia, and microdontia (LAMM) is a genetic transmission deafness syndrome.


It has been described in 6 families to date.

Clinical description

The profound congenital deafness is associated with a complete absence of inner ear structures (Michel aplasia); microtia type I with small auricle and narrow external auditory canal; and microdontia with widely spaced teeth.


Linkage analysis followed by sequencing of candidate genes led to identification of three different homozygous mutations in the FGF3 gene (11q13).

Genetic counseling

Transmission is autosomal recessive.

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Detailed information

Clinical genetics review
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