[Clinical characterization, molecular and FISH studies in 80 patients with clinical suspicion of Williams-Beuren syndrome].
BACKGROUND
Williams-Beuren syndrome is a developmental disorder affecting vascular and connective tissues and central nervous system. The syndrome is caused by a submicroscopic deletion in the chromosome 7 implicating the 7q11.23 region. Fluorescence in situ hybridization (FISH) and molecular studies allow us to confirm the clinical suspicion of this syndrome.


METHODS
We report clinical evaluation, FISH using Elastin Williams/D7S427 probe and molecular study with markers: D7S672, D7S653, D7S489B, D7S2476, D7S1870 and D7S489A, in 80 patients referred to test for Williams-Beuren syndrome.


RESULTS
We found hemizygosity for the critical region in 36 patients. From 69 cases studied by FISH, 28 showed the deletion. Molecular studies in 78 cases showed loss of heterozygosity (LOH) in 26 patients. The patients presented the deletion from the paternal or maternal chromosome at equal frequency. Clinical evaluation of mental retardation, facial features, esotopia dental, malocclusion, hoarse voice, supravalvular aortic stenosis (SVAS), hernias, join limitation, WBS personality and mental retardation from positive and negative patients showed estatistical significant differences for all items except mental retardation and joint limitation. The most significant item was the presence of SVAS.


CONCLUSIONS
This study confirms the usefulness of genetic studies as a diagnostic tool for William-Beuren Syndrome.
Milà
M
M
Servicio de Genética, Hospital Clínic i Provincial, Barcelona. montse@medicina.ub.es
Carrió
A
A
Sánchez
A
A
Gómez
D
D
Jiménez
D
D
Estivill
X
X
Ballesta
F
F
D002869:Chromosome Aberrations / Q000235:genetics; D002872:Chromosome Deletion; D025063:Chromosome Disorders; D002897:Chromosomes, Human, Pair 7 / Q000235:genetics; D004252:DNA Mutational Analysis; D005260:Female; D005819:Genetic Markers; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D007621:Karyotyping; D008297:Male; D018895:Microsatellite Repeats / Q000235:genetics; D017354:Point Mutation / Q000235:genetics; D016133:Polymerase Chain Reaction; D018980:Williams Syndrome / Q000175:diagnosis* / Q000235:genetics*
D005819:Genetic Markers
Caracterización clínica y genética de 80 pacientes con sospecha clínica de síndrome de Williams-Beuren.