Genetics and Molecular Biology, Volume: 44, Issue: 4, Published: 2021
  • FABP4 and omentin-1 gene expression in epicardial adipose tissue from coronary artery disease patients Human and Medical Genetics

    Miroshnikova, Valentina V.; Polyakova, Ekaterina A.; Pobozheva, Irina A.; Panteleeva, Aleksandra A.; Razgildina, Natalia D.; Kolodina, Diana A.; Belyaeva, Olga D.; Berkovich, Olga A.; Pchelina, Sofya N.; Baranova, Elena I.

    Abstract in English:

    Abstract Omentin-1 and fatty acid-binding protein 4 (FABP4) are adipose tissue adipokines linked to obesity-associated cardiovascular complications. The aim of this study was to investigate epicardial adipose tissue (EAT) omentin-1 and FABP4 gene expression in obese and non-obese patients with coronary artery disease (CAD). Omentin-1 and FABP4 mRNA levels in EAT and paired subcutaneous adipose tissue (SAT) as well as adipokine serum concentrations were assessed in 77 individuals (61 with CAD; 16 without CAD (NCAD)). EAT FABP4 mRNA level was decreased in obese CAD patients when compared to obese NCAD individuals (p=0.001). SAT FABP4 mRNA level was decreased in CAD patients compared to NCAD individuals without respect to their obesity status (p=0.001). Omentin-1 mRNA level in EAT and SAT did not differ between the CAD and NCAD groups. These findings suggest that omentin-1 gene expression in adipose tissue is not changed during CAD; downregulated FABP4 gene expression in SAT is associated with CAD while EAT FABP4 gene expression is decreased only in obesity-related CAD.
  • Exome sequencing and targeted gene panels: a simulated comparison of diagnostic yield using data from 158 patients with rare diseases Human and Medical Genetics

    Quaio, Caio Robledo D’Angioli Costa; Obando, María José Rivadeneira; Perazzio, Sandro Felix; Dutra, Aurelio Pimenta; Chung, Christine Hsiaoyun; Moreira, Caroline Monaco; Novo Filho, Gil Monteiro; Sacramento-Bobotis, Patricia Rossi; Penna, Michele Groenner; Souza, Rafaela Rogerio Floriano de; Cintra, Vivian Pedigone; Carnavalli, Juliana Emilia Prior; Silva, Rafael Alves da; Santos, Monize Nakamoto Provisor; Paixão, Daniele; Baratela, Wagner Antonio da Rosa; Olivati, Caroline; Spolador, Gustavo Marquezani; Pintao, Maria Carolina; Fornari, Alexandre Ricardo dos Santos; Burger, Matheus; Ramalho, Rodrigo Fernandes; Pereira, Otavio Jose Eulalio; Ferreira, Elisa Napolitano e; Mitne-Neto, Miguel; Kim, Chong Ae

    Abstract in English:

    Abstract Next-generation sequencing (NGS) has altered clinical genetic testing by widening the access to molecular diagnosis of genetically determined rare diseases. However, physicians may face difficulties selecting the best diagnostic approach. Our goal is to estimate the rate of possible molecular diagnoses missed by different targeted gene panels using data from a cohort of patients with rare genetic diseases diagnosed with exome sequencing (ES). For this purpose, we simulated a comparison between different targeted gene panels and ES: the list of genes harboring clinically relevant variants from 158 patients was used to estimate the theoretical rate of diagnoses missed by NGS panels from 53 different NGS panels from eight different laboratories. Panels presented a mean rate of missed diagnoses of 64% (range 14%-100%) compared to ES, representing an average predicted sensitivity of 36%. Metabolic abnormalities represented the group with highest mean of missed diagnoses (86%), while seizure represented the group with lowest mean (46%). Focused gene panels are restricted in covering select sets of genes implicated in specific diseases and they may miss molecular diagnoses of rare diseases compared to ES. However, their role in genetic diagnosis remains important especially for well-known genetic diseases with established genetic locus heterogeneity.
  • Primary cells derived from Tuberous Sclerosis Complex patients show autophagy alteration in the haploinsufficiency state Cellular, Molecular and Developmental Genetics

    Rosset, Clévia; Jaeger, Mariane da Cunha; Filippi-Chiela, Eduardo; Reis, Larissa Brussa; Sartor, Ivaine Taís Sauthier; Oliveira Netto, Cristina Brinckmann; Farias, Caroline Brunetto de; Roesler, Rafael; Ashton-Prolla, Patricia

    Abstract in English:

    Abstract Tuberous sclerosis complex (TSC) is an autosomal dominant cancer predisposition disorder caused by heterozygous mutations in TSC1 or TSC2 genes and characterized by mTORC1 hyperactivation. TSC-associated tumors develop after loss of heterozygosity mutations and their treatment involves the use of mTORC1 inhibitors. We aimed to evaluate cellular processes regulated by mTORC1 in TSC cells with different mutations before tumor development. Flow cytometry analyses were performed to evaluate cell viability, cell cycle and autophagy in non-tumor primary TSC cells with different heterozygous mutations and in control cells without TSC mutations, before and after treatment with rapamycin (mTORC1 inhibitor). We did not observe differences in cell viability and cell cycle between the cell groups. However, autophagy was reduced in mutated cells. After rapamycin treatment, mutated cells showed a significant increase in the autophagy process (p=0.039). We did not observe differences between cells with distinct TSC mutations. Our main finding is the alteration of autophagy in non-tumor TSC cells. Previous studies in literature found autophagy alterations in tumor TSC cells or knock-out animal models. We showed that autophagy could be an important mechanism that leads to TSC tumor formation in the haploinsufficiency state. This result could guide future studies in this field.
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