Gene expression results. (A) Relative expression of the REXO1L1 gene measured in several cell lines by RT-PCR. CaCo-2, HCT116, SW480, and SW620 = human colon cancer cell lines, MCF-7 and MCF12F = human breast cancer cell lines, M = marker. (B) Relative expression of the REXO1L1 gene measured by RT-PCR in HEK293T (Human Embryonic Kidney 293) cells after irradiation (5 Gy) as compared to untreated cells. (C) Differentially expressed genes identified by microarray analysis in proband’s fibroblasts are grouped according to the biological process in which are involved.