Título:	Altered expression of MLL methyltransferase family genes in breast cancer
Autor(es):	Ramos, Doralina do Amaral Rabello Moura, Carolina Amaro de Andrade, Rosângela Vieira de Motoyama, Andrea Barretto Pittella-Silva, Fabio
Afiliação do autor:	Universidade de Brasília, Faculdade de Ciências da Saúde, Laboratório de Patologia Molecular do Câncer Universidade Católica de Brasília, Laboratório de Ciências Genômicas e Biotecnologia Molecular
Assunto:	Mutação genética Mamas - câncer Metiltransferase
Data de publicação:	2013
Editora:	Spandidos Publications
Referência:	RABELLO, Doralina do Amaral et al. Altered expression of MLL methyltransferase family genes in breast cancer. International Journal of Oncology, v. 43, n. 2, p. 653-660, 2013. DOI: https://doi.org/10.3892/ijo.2013.1981.
Abstract:	The histone lysine methyltransferases contain a SET domain, which catalyzes the addition of methyl groups to specific lysine residues. The MLL family of genes encodes histone-modifying enzymes with histone 3-lysine 4 methyltransferase activity that can regulate gene transcription. The MLL family exists in multi-protein complexes and has been implicated in a variety of processes including normal development and cell growth. Although some of the MLL family members have already been described to be involved in cancer, a clear relationship of these genes with breast cancer is not determined to date. In the present study, we used quantitative PCR to investigate the expression profile of all five MLL genes [MLL (ALL-1), MLL2, MLL3, MLL4 and MLL5] in 7 breast cancer cell lines, 8 breast tumors and adjacent non-tumor tissues and in 12 normal tissues. We observed a diminished expression of all five genes in the breast cancer cell lines when compared to normal breast tissue. We found a significantly decreased expression of MLL2 in the tumor samples compared to the non-tumor controls. In tumor samples, MLL5 also showed a clear suppression tendency. Among the normal tissues analyzed, all genes showed a markedly higher expression in skeletal muscle and brain. Although further studies are required to determine the exact role of these methyltransferases in cancer development, our results indicate that the suppression of MLL genes, especially MLL2 and 5, take part in modulating breast carcinogenesis. Our assessment of the MLL family gene expression patterns in a diverse set of breast cancer cell lines and in a multitude of tissue types and breast tumors should lead to increasingly detailed information on the involvement of these genes in cancer progression.
DOI:	https://doi.org/10.3892/ijo.2013.1981
Versão da editora:	https://www.spandidos-publications.com/10.3892/ijo.2013.1981
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