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  • Title: A single nucleotide deletion resulting in a frameshift in exon 4 of TAB2 is associated with a polyvalular syndrome.
    Author: Permanyer E, Laurie S, Blasco-Lucas A, Maldonado G, Amador-Catalan A, Ferrer-Curriu G, Fuste B, Perez ML, Gonzalez-Alujas T, Beltran S, Comas-Riu J, Bardají A, Evangelista A, Galiñanes M.
    Journal: Eur J Med Genet; 2020 Apr; 63(4):103854. PubMed ID: 31981616.
    Abstract:
    OBJECTIVE: Polyvalvularmyxomatous degeneration is a rare clinical condition. A 51-year-old male patient presented at our centre with all four heart valves with myxomatous degeneration and severe mitral and aortic regurgitation due to leaflet prolapse. The patient referred five further family members with valvular heart disease at different stages of presentation. The aim of this study was to investigate the genetic basis of this familial polyvalvularmyxomatous degeneration which was associated with mild dysmorphic facial anomalies and short stature. DESIGN: A detailed family history was recorded. Nine members of the family, affected or not by valvular heart disease, were studied clinically, echocardiographically and by detailed genetic analyses. RESULTS: Six of the nine family members had echocardiographic features of different degrees of degenerative heart valve disease. In addition, the affected subjects shared similar mild dysmorphic facial anomalies and short stature. Exome sequencing identified a rare heterozygous single nucleotide deletion in the TAB2 gene in all affected family members, which was absent in the unaffected members. CONCLUSIONS: A variant in the TAB2 gene is proposed as the cause of syndromic congenital heart disease, displaying congenital myxomatous degenerative heart valve disease, mild dysmorphic fascial anomalies and short stature in this family.
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