Molecular analysis of holoprosencephaly in South America

Holoprosencephaly (HPE) is a spectrum of brain and facial malformations primarily reflecting genetic factors, such as chromosomal abnormalities and gene mutations. Here, we present a clinical and molecular analysis of 195 probands with HPE or microforms; approximately 72% of the patients were derived from the Latin American Collaborative Study of Congenital Malformations (ECLAMC), and 82% of the patients were newborns. Alobar HPE was the predominant brain defect in almost all facial defect categories, except for patients without oral cleft and median or lateral oral clefts. Ethmocephaly, cebocephaly, and premaxillary agenesis were primarily observed among female patients. Premaxillary agenesis occurred in six of the nine diabetic mothers. Recurrence of HPE or microform was approximately 19%. The frequency of microdeletions, detected using Multiplex Ligation-dependant Probe Amplification (MLPA) was 17% in patients with a normal karyotype. Cytogenetics or QF-PCR analyses revealed chromosomal anomalies in 27% of the probands. Mutational analyses in genes SHH, ZIC2, SIX3 and TGIF were performed in 119 patients, revealing eight mutations in SHH, two mutations in SIX3 and two mutations in ZIC2. Thus, a detailed clinical description of new HPE cases with identified genetic anomalies might establish genotypic and phenotypic correlations and contribute to the development of additional strategies for the analysis of new cases.250262Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Molecular analysis of holoprosencephaly in South America

Submitted by Santos Bárbara ([email protected]) on 2015-03-03T13:20:16Z No. of bitstreams: 1 Molecular analysis of holoprosencephaly in South America.pdf: 1134600 bytes, checksum: ca8b31fc87aa2e99d5a446f2722eba78 (MD5)Approved for entry into archive by Santos Bárbara ([email protected]) on 2015-03-03T13:20:29Z (GMT) No. of bitstreams: 1 Molecular analysis of holoprosencephaly in South America.pdf: 1134600 bytes, checksum: ca8b31fc87aa2e99d5a446f2722eba78 (MD5)Approved for entry into archive by Santos Bárbara ([email protected]) on 2015-03-03T14:00:31Z (GMT) No. of bitstreams: 1 Molecular analysis of holoprosencephaly in South America.pdf: 1134600 bytes, checksum: ca8b31fc87aa2e99d5a446f2722eba78 (MD5)Made available in DSpace on 2015-03-03T14:00:31Z (GMT). No. of bitstreams: 1 Molecular analysis of holoprosencephaly in South America.pdf: 1134600 bytes, checksum: ca8b31fc87aa2e99d5a446f2722eba78 (MD5) Previous issue date: 2014Universidade Federal do Rio de Janeiro. Departamento de Genética. Estudo Colaborativo Latino Americano de Malformações Congênitas. Rio de Janeiro, RJ, Brasil. / Instituto Nacional de Genética Médica Populacional, Rio de Janeiro, RJ, Brasil.Universidade Federal do Estado do Rio de Janeiro. Departamento de Genética e Biologia Molecular. Rio de Janeiro, RJ, Brasil.Universidade do Estado do Rio de Janeiro. Instituto de Biologia Roberto Alcantara Gomes. Departamento de Genética. Rio de Janeiro, RJ, Brasil.Instituto Cândida Vargas. Maternidade Cândida Vargas. João Pessoa, PB, Brasil.Centro di Consulenza Genetica e di Teratologia della Riproduzione. Dipartimento Materno Infantile. ARNAS Garibaldi Nesima. Catania, CT, Italy.Universidade Estadual de Campinas. Departamento de Genética Médica. Campinas, SP, Brasil.Hospital das Clínicas de Porto Alegre. Serviço de Genética Médica. Porto Alegre, RS, Brasil.Registro Campano Difetti Congeniti. Azienda Ospedaliera “Gaetano Rummo”. Benevento, BN, Italy.Fundação Oswaldo Cruz. Instituto Fernandes Figueira. Centro de Genética Médica. Rio de Janeiro, RJ, Brasil.Universidade Federal do Estado do Rio de Janeiro. Departamento de Genética e Biologia Molecular. Rio de Janeiro, RJ, Brasil. / Fundação Oswaldo Cruz. Estudo Colaborativo Latino Americano de Malformações Congênitas. Laboratório de Epidemiologia de Defeitos Congênitos. Rio de Janeiro, RJ, Brasil.Instituto Nacional de Câncer. Programa de Genética. Rio de Janeiro, RJ, Brasil.Instituto Nacional de Câncer. Programa de Genética. Rio de Janeiro, RJ, Brasil.Instituto Nacional de Genética Médica Populacional, Rio de Janeiro, RJ, Brasil. / Centro de Educación Médica e Investigación Clínica. Estudio Colaborativo Latino Americano de Malformaciones Congenitas. Buenos Aires, Argentina.Universidade Federal do Rio de Janeiro. Departamento de Genética. Estudo Colaborativo Latino Americano de Malformações Congênitas. Rio de Janeiro, RJ, Brasil. / Instituto Nacional de Genética Médica Populacional, Rio de Janeiro, RJ, Brasil.Holoprosencephaly (HPE) is a spectrum of brain and facial malformations primarily reflecting genetic factors, such as chromosomal abnormalities and gene mutations. Here, we present a clinical and molecular analysis of 195 probands with HPE or microforms; approximately 72% of the patients were derived from the Latin American Collabo-rative Study of Congenital Malformations (ECLAMC), and 82% of the patients were newborns. Alobar HPE was the predominant brain defect in almost all facial defect categories, except for patients without oral cleft and median or lat-eral oral clefts. Ethmocephaly, cebocephaly, and premaxillary agenesis were primarily observed among female pa-tients. Premaxillary agenesis occurred in six of the nine diabetic mothers. Recurrence of HPE or microform was approximately 19%. The frequency of microdeletions, detected using Multiplex Ligation-dependant Probe Amplifica-tion (MLPA) was 17% in patients with a normal karyotype. Cytogenetics or QF-PCR analyses revealed chromosomal anomalies in 27% of the probands. Mutational analyses in genesSHH,ZIC2,SIX3andTGIFwere performed in 119 patients, revealing eight mutations inSHH,two mutations inSIX3and two mutations inZIC2. Thus, a detailed clinical description of new HPE cases with identified genetic anomalies might establish genotypic and phenotypic correla-tions and contribute to the development of additional strategies for the analysis of new cases