Loss of CITED1, an MITF regulator, drives a phenotype switch in vitro and can predict clinical outcome in primary melanoma tumours

PeerJ
Jillian HowlinGöran Jönsson

Abstract

CITED1 is a non-DNA binding transcriptional co-regulator whose expression can distinguish the 'proliferative' from 'invasive' signature in the phenotype-switching model of melanoma. We have found that, in addition to other 'proliferative' signature genes, CITED1 expression is repressed by TGFβ while the 'invasive' signature genes are upregulated. In agreement, CITED1 positively correlates with MITF expression and can discriminate the MITF-high/pigmentation tumour molecular subtype in a large cohort (120) of melanoma cell lines. Interestingly, CITED1 overexpression significantly suppressed MITF promoter activation, mRNA and protein expression levels while MITF was transiently upregulated following siRNA mediated CITED1 silencing. Conversely, MITF siRNA silencing resulted in CITED1 downregulation indicating a reciprocal relationship. Whole genome expression analysis identified a phenotype shift induced by CITED1 silencing and driven mainly by expression of MITF and a cohort of MITF target genes that were significantly altered. Concomitantly, we found changes in the cell-cycle profile that manifest as transient G1 accumulation, increased expression of CDKN1A and a reduction in cell viability. Additionally, we could predict surviva...Continue Reading

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Citations

Feb 2, 2016·The Journal of Investigative Dermatology·Emmi PuujalkaPeter Petzelbauer
Feb 15, 2017·The FEBS Journal·Imanol Arozarena, Claudia Wellbrock
Feb 1, 2019·International Journal of Molecular Sciences·Tamar Golan, Carmit Levy
Apr 13, 2021·Neoplasia : an International Journal for Oncology Research·Diogo de Oliveira PessoaMiriam Galvonas Jasiulionis

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Methods Mentioned

BETA
ubiquitination
transfection
transfections
Fluorescence
ChIP-seq
flow cytometry
PCR

Software Mentioned

ModFit
SAM
DAVID
MeV
BD Cell Quest
R
BASE
Affymetrix

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