SF2/ASF and SRPK2: correlation of alternative splicing machinery and leucemia development

Author(s)

Germanna Lima Righetto

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia
• Defense date: 2013-03-20

Examining board members

Jörg Kobarg; Carmen Silvia Passos Lima; Ana Carolina de Mattos Zeri

• Advisor: José Andrés Yunes; Jörg Kobarg

Abstract

The mRNA splicing is the cellular process responsible for RNA edition, expanding the genome by the combination of gene exons. Mutations in components of this machinery may cause or contribute to a variety of diseases, including cancer. The SF2/ASF protein was the first splicing factor characterized as proto-oncogenic by its overexpression in diverse neoplasias. The cellular activation of this and other splicing factors are mainly dependent on specific kinases, known as splicing kinases and components of a SRPKs family. The SRPK1 kinase, responsible for the cytoplasmic phosphorylation of SF2/ASF, is overexpressed in leukemia. SRPK2, a paralog of SRPK1, is involved in leukemia cell proliferation and differentiation. In this study we searched for splicing machinery and cancer correlations, focusing in the relationship of this machinery and leukemia. In this study we searched for alterations in SRPK2 cDNA and quantified the expression of this kinase and SRPK1 and CLK1 in leukemia immortalized cells. Moreover, we analyzed using Exon Arrays (Affymetrix) the effect of SF2/ASF overexpression in global splicing of non-oncogenic cells, searching for alterations related to its oncogenic character. In this study we discovered two new isoforms of SRPK2 amplified through different leukemia cell lineages. We confirmed the differential expression of SRPK1 and SRPK2 kinases in lymphoid and myeloid leukemia lineages indicating a divergent correlation of these kinases in different leukemia types. In the Exon Array preliminary analysis we also observed important alterations in cellular gene expression. These data and the alterations found in SR kinases provide new and interesting clues about the relationship of splicing machinery alterations and oncogenesis (AU)

• FAPESP's process: 10/12884-2 - SF2/ASF and its kinases: relation between alternative splicing and leukemia.
• Grantee: Germanna Lima Righetto
• Support Opportunities: Scholarships in Brazil - Master