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Genetic and phenotypic dissection of 1q43q44 microdeletion syndrome and neurodevelopmental phenotypes associated with mutations in ZBTB18 and HNRNPU

2017; Springer Science+Business Media; Volume: 136; Issue: 4 Linguagem: Inglês

10.1007/s00439-017-1772-0

1432-1203

Christel Depienne, Caroline Nava, Boris Keren, Solveig Heide, Agnès Rastetter, Sandrine Passemard, Sandra Chantot‐Bastaraud, Marie‐Laure Moutard, Pankaj B. Agrawal, Grace E. VanNoy, Joan M. Stoler, David J. Amor, Thierry Billette de Villemeur, Diane Doummar, Caroline Alby, Valérie Cormier‐Daire, Cathérine Garel, Pauline Marzin, Sophie Scheidecker, Anne de Saint Martin, Édouard Hirsch, Christian Korff, Armand Bottani, Laurence Faivre, Alain Verloès, Christine Orzechowski, Lydie Bürglen, Bruno Leheup, J. Roume, Joris Andrieux, Frenny Sheth, Chaitanya Datar, Michael Parker, Laurent Pasquier, Sylvie Odent, Sophie Naudion, Marie‐Ange Delrue, Cédric Le Caignec, Marie Vincent, Bertrand Isidor, Florence Renaldo, Fiona Stewart, Annick Toutain, Udo Koehler, Birgit Häckl, Celina von Stülpnagel, Gerhard Kluger, Rikke S. Møller, Deb K. Pal, Tord Jonson, Maria Soller, Nienke E. Verbeek, Mieke M. van Haelst, Carolien G. F. de Kovel, Bobby Koeleman, Glen R. Monroe, Gijs van Haaften, Tania Attié‐Bitach, Lucile Boutaud, Delphine Héron, Cyril Mignot,

Genomics and Rare Diseases

Subtelomeric 1q43q44 microdeletions cause a syndrome associating intellectual disability, microcephaly, seizures and anomalies of the corpus callosum. Despite several previous studies assessing genotype-phenotype correlations, the contribution of genes located in this region to the specific features of this syndrome remains uncertain. Among those, three genes, AKT3, HNRNPU and ZBTB18 are highly expressed in the brain and point mutations in these genes have been recently identified in children with neurodevelopmental phenotypes. In this study, we report the clinical and molecular data from 17 patients with 1q43q44 microdeletions, four with ZBTB18 mutations and seven with HNRNPU mutations, and review additional data from 37 previously published patients with 1q43q44 microdeletions. We compare clinical data of patients with 1q43q44 microdeletions with those of patients with point mutations in HNRNPU and ZBTB18 to assess the contribution of each gene as well as the possibility of epistasis between genes. Our study demonstrates that AKT3 haploinsufficiency is the main driver for microcephaly, whereas HNRNPU alteration mostly drives epilepsy and determines the degree of intellectual disability. ZBTB18 deletions or mutations are associated with variable corpus callosum anomalies with an incomplete penetrance. ZBTB18 may also contribute to microcephaly and HNRNPU to thin corpus callosum, but with a lower penetrance. Co-deletion of contiguous genes has additive effects. Our results confirm and refine the complex genotype-phenotype correlations existing in the 1qter microdeletion syndrome and define more precisely the neurodevelopmental phenotypes associated with genetic alterations of AKT3, ZBTB18 and HNRNPU in humans.