Journal: Skeletal Muscle
Article Title: The transcriptomic signature of age and sex is not conserved in human primary myotubes
doi: 10.1186/s13395-026-00416-7
Figure Lengend Snippet: Maintenance of the age phenotype between muscle tissue and differentiated HPMCs. A Scatter plot depicting the log 2 fold-change of each individual gene expressed in young ( N = 10) and older ( N = 10) muscle tissue and in the corresponding young ( N = 10) and older ( N = 10) differentiated muscle cell lines. Genes differentially expressed at FDR < 0.05 and down regulated in both young cell and muscle tissue are depicted in black. Genes differentially expressed at FDR < 0.05 and down regulated in young cells only are depicted in blue. Genes differentially expressed at FDR < 0.05 and up regulated in young cells only are depicted in green. Genes differentially expressed at FDR < 0.05 and down regulated in young muscle tissue only are depicted in orange. Genes differentially expressed at FDR < 0.05 and up regulated in young muscle tissue only are depicted in dark red. B Differential expression rank–rank density contour plot with cell and tissue contrasts on the x- and y-axes, respectively. Each point represents a gene ranked by its differential expression in both contrasts, and the filled contours indicate gene density across the rank space. The four quadrants correspond to directional patterns of regulation: genes upregulated in both contrasts (top right), downregulated in both (bottom left), or oppositely regulated (top left and bottom right). The relatively even spread of density across all quadrants reflects the absence of a consistent transcriptional signature shared between aged muscle tissue and cultured cells. C Heatmap depicting the differentially regulated Reactome pathways in young ( N = 10) and older ( N = 10) muscle tissue (control) and in the corresponding young ( N = 10) and older ( N = 10) differentiated HPMC lines (case)
Article Snippet: Reactome gene sets from Homo sapiens were based on the msigdbr package (v7.5.1) and curated for skeletal muscle tissue activation using PubChem and The Human Protein Atlas, with all non-filtered gene sets presented in Supplementary Tables.
Techniques: Quantitative Proteomics, Cell Culture, Control