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Genotype–phenotype correlations in MYCN‐related Feingold syndrome
Author(s) -
Marcelis Carlo L.M.,
Hol Frans A.,
Graham Gail E.,
Rieu Paul N.M.A.,
Kellermayer Richard,
Meijer Rowdy P.P.,
Lugtenberg Dorien,
Scheffer Hans,
van Bokhoven Hans,
Brunner Han G.,
de Brouwer Arjan P.M.
Publication year - 2008
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/humu.20750
Subject(s) - biology , genetics , missense mutation , syndactyly , exon , haploinsufficiency , phenotype , gene , germline mutation , nonsense mediated decay , microcephaly , mutation , rna splicing , rna
Abstract Feingold syndrome (FS) is the most frequent cause of familial syndromic gastrointestinal atresia and follows autosomal dominant inheritance. FS is caused by germline mutations in or deletions of the MYCN gene. Previously, 12 different heterozygous MYCN mutations and two deletions containing multiple genes including MYCN were described. All these mutations result in haploinsufficiency of both the canonical MYCN protein and the shorter isoform, ΔMYCN. We report 11 novel mutations including seven mutations in exon 2 that result in a premature termination codon (PTC) in the long MYCN transcript. Moreover, we have identified a PTC in exon 1 that only affects the ΔMYCN isoform, without a phenotypic effect. This suggests that mutations in only Δ MYCN do not contribute to the FS. Additionally, we found three novel deletions encompassing MYCN . Together with our previous report we now have a total of four missense mutations in the DNA binding domain, 19 PTCs of which six render the transcript subject to nonsense‐mediated decay (NMD), and five larger deletions in a total of 77 patients. We have reviewed the clinical features of these patients, and found that digital anomalies, e.g., brachymesophalangy and toe syndactyly, are the most consistent features, present in 100% and 97% of the patients, respectively. Small head circumference was present in 89% of the cases. Gastrointestinal atresia remains the most important major congenital anomaly (55%), but cardiac and renal anomalies are also frequent. We suggest that the presence of brachymesophalangy and toe syndactyly in combination with microcephaly is enough to justify MYCN analysis. Hum Mutat 29(9), 1125–1132, 2008. © 2008 Wiley‐Liss, Inc.