Screening for Novel LOX and SOD1 Variants in Keratoconus Patients From Brazil

Purpose: To investigate the presence of the variants of lysyl oxygenase (LOX) and superoxide dismutase 1 (SOD1) genes in Brazilian patients with advanced keratoconus. Methods: Donor genomic DNA extracted from blood samples was screened for 5'UTR, exonic LOX, and SOD1 variants in a subset of 26 patients presenting with advanced keratoconus (KISA > 1000% and I–S > 2.0) by Sanger sequencing. The impact of non-synonymous amino acid changes was evaluated by SIFT, PMUT, and PolyPhen algorithms. The Mutation Taster tool was used to evaluate the potential impact of formation of new donor and acceptor splice sites in the promoter region of affected volunteers carrying sequence variants. A 7-base SOD1 deletion (IVS2 + 50del7bp) previously associated with keratoconus was screened in 140 patients presenting classical keratoconus by gel fragment analysis, and positive samples were sequenced for confirmation. Results: We found an unreported missense variant in LOX exon 6 in one heterozygous patient, leading to substitution of proline with threonine at residue 392 (p. Thr392Pro) of LOX protein sequence. This mutation was predicted to be potentially damaging to LOX protein. Another LOX variant, Arg158Gln, was also detected in another patient but predicted to be non-pathogenic. Two additional new polymorphisms in LOX 5'UTR region (–116C > T and –58C > T) were found in two patients presenting with advanced keratoconus and were predicted to modulate or create donor/acceptor splice sites in LOX transcripts. Additionally, SOD1 deletion was detected in one patient presenting with severe keratoconus, not in control samples. Conclusion: We described three novel LOX polymorphisms identified for the first time in Brazilian patients with advanced keratoconus, as well as a previously described SOD1 deletion strongly associated with keratoconus. A possible role of these variants in modulating transcript levels in the cornea of affected individual requires further investigation

MicroRNAs 145 and 148a Are Upregulated During Congenital Zika Virus Infection.

Submitted by Fábio Marques ([email protected]) on 2019-07-04T13:28:28Z No. of bitstreams: 1 MicroRNAs_Marcelo_Ribeiro-Alves_INI_Lapclin-AIDS_2019.pdf: 1352248 bytes, checksum: 0223da5170d1c175d5eb393366ef4edd (MD5)Approved for entry into archive by Regina Costa ([email protected]) on 2019-07-04T16:40:10Z (GMT) No. of bitstreams: 1 MicroRNAs_Marcelo_Ribeiro-Alves_INI_Lapclin-AIDS_2019.pdf: 1352248 bytes, checksum: 0223da5170d1c175d5eb393366ef4edd (MD5)Made available in DSpace on 2019-07-04T16:40:10Z (GMT). No. of bitstreams: 1 MicroRNAs_Marcelo_Ribeiro-Alves_INI_Lapclin-AIDS_2019.pdf: 1352248 bytes, checksum: 0223da5170d1c175d5eb393366ef4edd (MD5) Previous issue date: 2019Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.Department of Microbiology, Immunology & Tropical Medicine, The George Washington University, Washington, DC, USA.Faculdade de Ciências Médicas de Campina Grande, Núcleo de Genética Médica, Centro Universitário UniFacisa, Campina Grande, Brasil.Instituto de Pesquisa Professor Amorim Neto, Campina Grande, Brasil.Serviço de Neurologia, Hospital Vera Cruz, Belo Horizonte, Brasil.Fundação Oswaldo Cruz. Instituto Fernandes Figueira. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Fernandes Figueira. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Fernandes Figueira. Rio de Janeiro, RJ, Brasil.Laboratório de Neuropatologia, Instituto Estadual do Cérebro, Rio de Janeiro, Brasil.Faculdade de Ciências Médicas de Campina Grande, Núcleo de Genética Médica, Centro Universitário UniFacisa, Campina Grande, Brasil./ Instituto de Pesquisa Professor Amorim Neto, Campina Grande, Brasil.Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.Division of Infectious Diseases, Weill Cornell Medicine, New York City, NY, USA.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil./ Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil