| Full text | |
| Author(s): Show less - |
Rivas, Maria Prates
[1]
;
Marques Aguiar, Talita Ferreira
[2, 1]
;
Fernandes, Gustavo Ribeiro
[3]
;
Caires, Luiz Carlos
[1]
;
Goulart, Ernesto
[1]
;
Telles-Silva, Kayque Alves
[1]
;
Cypriano, Monica
[4]
;
Caminada de Toledo, Silvia Regina
[4]
;
Rosenberg, Carla
[1]
;
Carraro, Dirce Maria
[2]
;
Lima da Costa, Cecilia Maria
[5]
;
da Cunha, Isabela Werneck
[6]
;
Victorino Krepischi, Ana Cristina
[1]
Total Authors: 13
|
| Affiliation: | [1] Univ Sao Paulo, Inst Biosci, Dept Genet & Evolutionary Biol, Human Genome & Stem Cell Res Ctr, Sao Paulo - Brazil
[2] AC Camargo Canc Ctr, Int Ctr Res, Sao Paulo - Brazil
[3] Univ Sao Paulo, Dept Biochem Inst Chem, Sao Paulo - Brazil
[4] Univ Fed Sao Paulo, Dept Pediat Support Grp Children & Adolescents Ca, Sao Paulo - Brazil
[5] AC Camargo Canc Ctr, Dept Pediat Oncol, Sao Paulo - Brazil
[6] Rede Dor Sao Luiz, Dept Pathol, Sao Paulo - Brazil
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | FRONTIERS IN GENETICS; v. 10, JUN 12 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
Hepatoblastoma is an embryonal liver tumor carrying few genetic alterations. We previously disclosed in hepatoblastomas a genome-wide methylation dysfunction, characterized by hypermethylation at specific CpG islands, in addition to a low-level hypomethylation pattern in non-repetitive intergenic sequences, in comparison to non-tumoral liver tissues, shedding light into a crucial role for epigenetic dysregulation in this type of cancer. To explore the underlying mechanisms possibly related to aberrant epigenetic modifications, we evaluated the expression profile of a set of genes engaged in the epigenetic machinery related to DNA methylation (DNMT1, DNMT3A, DNMT3B, DNMT3L, UHRF1, TET1, TET2, and TET3), as well as the 5-hydroxymethylcytosine (5hmC) global level. We observed in hepatoblastomas a general disrupted expression of these genes from the epigenetic machinery, mainly UHRF1, TET1, and TET2 upregulation, in association with an enrichment of 5hmC content. Our findings support a model of active demethylation by TETs in hepatoblastoma, probably during early stages of liver development, which in combination with UHRF1 overexpression would lead to DNA hypomethylation and an increase in overall 5hmC content. Furthermore, our data suggest that decreased 5hmC content might be associated with poor survival rate, highlighting a pivotal role of epigenetics in hepatoblastoma development and progression. (AU) | |
| FAPESP's process: | 16/23462-8 - Epigenetic mechanisms in liver tumors: expression modulation of epigenetic gene regulators and gene expression analysis by RNAseq in hepatoblastoma. |
| Grantee: | Maria Prates Rivas |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 17/16283-2 - Development of tissue bioengineering techniques for the functional reconstruction of ex vivo iPSC cell livers |
| Grantee: | Luiz Carlos de Caires Júnior |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 16/04785-0 - Study of somatic mutations identified in exome sequencing of hepatoblastoma |
| Grantee: | Talita Ferreira Marques Aguiar |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 15/14821-1 - Development of functional hepatic by-pass using iPSCs-derived cells |
| Grantee: | Ernesto da Silveira Goulart Guimarães |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 13/08028-1 - CEGH-CEL - Human Genome and Stem Cell Research Center |
| Grantee: | Mayana Zatz |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |