arXiv subjects

Abderrahim Chafik

Publications and source records attributed to Abderrahim Chafik.

2 recordsLinked to original sources

arXiv2016

miR-34a-5p and miR-34a-3p contribute to the signaling pathway of p53 by targeting overlapping sets of genes

In contrary to the common belief that only one strand of the pre-miRNA is active (usually the 5p one that is the more abundant) while the second one (miRNA*) is discarded, functional 5p and 3p have been observed for many miRNAs. Among those miRNAs is miR-34a which is a target gene of the tumor suppressor p53. In this paper we have re-examined the role of miR-34a-5p and miR-34a-3p in the signaling pathway of p53. We found that they target overlapping sets of genes (MDM2 and THBS1). By a GO enrichment analysis we found that THBS1 is involved in cancer and metastasis relevant processes. We have also deduce that p53, MDM2 and miR-34a are linked by a type 1 incoherent FFL that represent a novel mechanism for accelerating the response of p53 to external stress signals.

q-bio.MN↗

arXiv2016

The role of CRKL in Breast Cancer Metastasis: Insights from Systems Biology

MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression post-transcriptionally. They are involved in key biological processes and then may play a major role in the development of human diseases including cancer, in particular their involvement in breast cancer metastasis has been confirmed. Recently, the authors of ref.(\cite{key1} have found that miR-429 may have a role in the inhibition of breast cancer metastasis and have identified its target gene CRKL as a potential candidate. In this paper, by using systems biology tools we have shown that CRKL is involved in positive regulation of ERK1/2 signaling pathway and contribute to the regulation of LYN through a topological generalization of feed forward loop.

q-bio.MN↗