Abstract:
:Unraveling the causes and pathomechanisms of progressive disorders is essential for the development of therapeutic strategies. Here, we identified heterozygous pathogenic missense variants of LMX1A in two families of Dutch origin with progressive nonsyndromic hearing impairment (HI), using whole exome sequencing. One variant, c.721G > C (p.Val241Leu), occurred de novo and is predicted to affect the homeodomain of LMX1A, which is essential for DNA binding. The second variant, c.290G > C (p.Cys97Ser), predicted to affect a zinc-binding residue of the second LIM domain that is involved in protein-protein interactions. Bi-allelic deleterious variants of Lmx1a are associated with a complex phenotype in mice, including deafness and vestibular defects, due to arrest of inner ear development. Although Lmx1a mouse mutants demonstrate neurological, skeletal, pigmentation and reproductive system abnormalities, no syndromic features were present in the participating subjects of either family. LMX1A has previously been suggested as a candidate gene for intellectual disability, but our data do not support this, as affected subjects displayed normal cognition. Large variability was observed in the age of onset (a)symmetry, severity and progression rate of HI. About half of the affected individuals displayed vestibular dysfunction and experienced symptoms thereof. The late-onset progressive phenotype and the absence of cochleovestibular malformations on computed tomography scans indicate that heterozygous defects of LMX1A do not result in severe developmental abnormalities in humans. We propose that a single LMX1A wild-type copy is sufficient for normal development but insufficient for maintenance of cochleovestibular function. Alternatively, minor cochleovestibular developmental abnormalities could eventually lead to the progressive phenotype seen in the families.
journal_name
Hum Genetjournal_title
Human geneticsauthors
Wesdorp M,de Koning Gans PAM,Schraders M,Oostrik J,Huynen MA,Venselaar H,Beynon AJ,van Gaalen J,Piai V,Voermans N,van Rossum MM,Hartel BP,Lelieveld SH,Wiel L,Verbist B,Rotteveel LJ,van Dooren MF,Lichtner P,Kunst HPM,doi
10.1007/s00439-018-1880-5subject
Has Abstractpub_date
2018-05-01 00:00:00pages
389-400issue
5eissn
0340-6717issn
1432-1203pii
10.1007/s00439-018-1880-5journal_volume
137pub_type
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