Large-scale deletions and SMADIP1 truncating mutations in syndromic Hirschsprung disease with involvement of midline structures.
Hirschsprung disease (HSCR) is a common malformation of neural-crest-derived enteric neurons that is frequently associated with other congenital abnormalities. The SMADIP1 gene recently has been recognized as disease causing in some patients with 2q22 chromosomal rearrangement, resulting in syndromic HSCR with mental retardation, with microcephaly, and with facial dysmorphism. We screened 19 patients with HSCR and mental retardation and eventually identified large-scale SMADIP1 deletions or truncating mutations in 8 of 19 patients. These results allow further delineation of the spectrum of malformations ascribed to SMADIP1 haploinsufficiency, which includes frequent features such as hypospadias and agenesis of the corpus callosum. Thus, SMADIP1, which encodes a transcriptional corepressor of Smad target genes, may play a role not only in the patterning of neural-crest-derived cells and of CNS but also in the development of midline structures in humans.
Amiel
J
J
Département de Génétique, et Unité INSERM U-393, Hôpital Necker-Enfants Malades, Paris, France.
Espinosa-Parrilla
Y
Y
Steffann
J
J
Gosset
P
P
Pelet
A
A
Prieur
M
M
Boute
O
O
Choiset
A
A
Lacombe
D
D
Philip
N
N
Le Merrer
M
M
Tanaka
H
H
Till
M
M
Touraine
R
R
Toutain
A
A
Vekemans
M
M
Munnich
A
A
Lyonnet
S
S
D000015:Abnormalities, Multiple / Q000235:genetics*; D002675:Child, Preschool; D002872:Chromosome Deletion; D002889:Chromosomes, Human, Pair 2 / Q000235:genetics*; D004252:DNA Mutational Analysis; D005145:Face / Q000002:abnormalities; D005260:Female; D006627:Hirschsprung Disease / Q000150:complications* / Q000235:genetics*; D018398:Homeodomain Proteins / Q000235:genetics*; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D008607:Intellectual Disability / Q000235:genetics; D008297:Male; D008831:Microcephaly / Q000235:genetics; D010375:Pedigree; D018807:Polymorphism, Single-Stranded Conformational; D012097:Repressor Proteins / Q000235:genetics*; D017384:Sequence Deletion / Q000235:genetics*; D013577:Syndrome; D000074165:Zinc Finger E-box Binding Homeobox 2
D018398:Homeodomain Proteins; D012097:Repressor Proteins; C492363:ZEB2 protein, human; D000074165:Zinc Finger E-box Binding Homeobox 2