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X‐linked Opitz syndrome: Novel mutations in the MID1 gene and redefinition of the clinical spectrum
Author(s) -
De Falco Francesca,
Cainarca Silvia,
Andolfi Grazia,
Ferrentino Rosa,
Berti Caterina,
Rodríguez Criado German,
Rittinger Olaf,
Dennis Nick,
Odent Sylvie,
Rastogi Amit,
Liebelt Jan,
Chitayat David,
Winter Robin,
Jawanda Harindar,
Ballabio Andrea,
Franco Brunella,
Meroni Germana
Publication year - 2003
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.10265
Subject(s) - hypertelorism , hypospadias , syndactyly , phenotype , genetics , gene , mutation , micropenis , medicine , biology
Abstract Opitz (or G/BBB) syndrome is a pleiotropic genetic disorder characterized by hypertelorism, hypospadias, and additional midline defects. This syndrome is heterogeneous with an X‐linked (XLOS) and an autosomal dominant (ADOS) form. The gene implicated in the XLOS form, MID1 , encodes a protein containing a RING‐Bbox‐Coiled‐coil motif belonging to the tripartite motif (TRIM) family. To further clarify the molecular basis of XLOS, we have undertaken mutation analysis of the MID1 gene in patients with Opitz syndrome (OS). We found novel mutations in 11 of 63 male individuals referred to us as sporadic or familial X‐linked OS cases. The mutations are scattered throughout the gene, although more are represented in the 3′ region. By reviewing all the MID1 ‐mutated OS patients so far described, we confirmed that hypertelorism and hypospadias are the most frequent manifestations, being present in almost every XLOS individual. However, it is clear that laryngo‐tracheo‐esophageal (LTE) defects are also common anomalies, being manifested by all MID1 ‐mutated male patients. Congenital heart and anal abnormalities are less frequent than reported in literature. In addition, we can include limb defects in the OS clinical synopsis as we found a MID1 ‐mutated patient showing syndactyly. The low frequency of mutations in MID1 and the high variability of the phenotype suggest the involvement of other genes in the OS phenotype. © 2003 Wiley‐Liss, Inc.