Bone marrow mononuclear cells were purified on Ficoll gradients, and pellets were processed for nucleic acid extraction using a
DNA/RNA Kit (Qiagen). Genomic DNA was studied by high-throughput sequencing of 45 genes recurrently mutated in myeloid malignancies using a panel designed on Human genome hg19, and sequencing was performed on
Ion PGM™ (Life Technologies) on a dedicated 318 V2 chip [60 ]. Libraries were prepared using
Ion AmpliSeq library kit2 384 (Life Technologies) according to the manufacturer’s instructions. The average coverage per gene was ≥ 500×. Reads were aligned against human genome build 19 (hg19) and analyzed for single nucleotide variant (SNV) calling with the
NextGENe software (SoftGenetics, Chicago, IL) and with an in-house pipeline (Polydiag, Institut Imagine, Université de Paris). We reported all clinically relevant variants with a variant allele frequency (VAF) cutoff at 2%. All the samples were also screened for ASXL1 (including c.1934dupG; p.G646WfsX12) and SRSF2 mutations by Sanger sequencing. Moreover, aligned reads from .bam files were visualized using the Integrative Genomics Viewer v2.3 from the Broad Institute (Cambridge, MA, USA). Assessment of variant implication was performed based on population databases (dbSNP and GnomAD), mutation databases (COSMIC), and prediction software (Alamut, mutation taster, OncoKB, and Cancer Genome Interpreter).
Dussiau C., Boussaroque A., Gaillard M., Bravetti C., Zaroili L., Knosp C., Friedrich C., Asquier P., Willems L., Quint L., Bouscary D., Fontenay M., Espinasse T., Plesa A., Sujobert P., Gandrillon O, & Kosmider O. (2022). Hematopoietic differentiation is characterized by a transient peak of entropy at a single-cell level. BMC Biology, 20, 60.