Browsing by Subject "reactive oxygen species"

Biallelic germline mutations in ERCC6L2 cause bone marrow failure (BMF) and predisposition to myelodysplastic syndrome (MDS) and acute myeloid leukemia (AML). The patients often develop varying cytopenias, and underlying hypoplasia in the bone marrow is usually evident. The aim of this thesis was to characterize the transcriptome of patient -derived fibroblasts with biallelic germline ERCC6L2 mutation. Moreover, the aim was to study changes on the gene expression at the RNA level in fibroblasts in different media conditions, ROS levels in ERCC6L2 -mutated fibroblasts, and whether addition of glutamine impacts the ROS levels. Fibroblasts from 16 skin biopsies were cultured; eight samples were from healthy controls and eight samples from patients with known mutations in ERCC6L2. Fibroblasts were cultured in different media conditions, followed by RNA extraction and RNA sequencing. We observed downregulation in base excision repair, nucleotide excision repair, mismatch repair, DNA replication, homologous recombination, and cell cycle in ERCC6L2 -mutated cells. MAPK signaling pathway, p53 signaling pathway, apoptosis, AMPK signaling pathway, and TGF-beta signaling pathway were in turn upregulated in ERCC6L2 -mutated cells. The medium did not affect the gene expression significantly across samples. We suspect that the effect of medium was not detected at the RNA level, but it might affect post-translational modifications. We also detected increased ROS levels in ERCC6L2 samples compared to control and observed decreased ROS levels in ERCC6L2 and control samples with excess glutamine. This study shows that biallelic mutations in ERCC6L2 do not only affect the bone marrow but can also affect tissues outside of the hematopoietic system. The transcriptomic analysis identified important biological processes, which could be studied with more detail in the future to further explore the pathology of the ERCC6L2 disease.