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Fig. 4 | BMC Genomics

Fig. 4

From: The landscape of mitochondrial small non-coding RNAs in the PGCs of male mice, spermatogonia, gametes and in zygotes

Fig. 4

Expression of mitochondrially encoded piRNAs and hallmarks of the mitochondrial piRNA populations from male PGCs, spermatogonia and spermatozoa, and oocytes and zygotes. a Expression heatmap of piRNAs generated from different mitochondrial genes where the heatmap color indicates the normalized expression of piRNAs derived from mitochondrial genes. The annotation of mitochondrial genes was obtained from Ensembl database. b Coverage distribution of the piRNAs from tRNAs in different samples, the graphs representing the median coverage of piRNA reads in the different tRNA samples. Schematic representation of tRNA arms. c The read length distribution of the piRNA populations derived from the mtDNA. The read percentage was calculated using the total number of piRNA reads in each sample. d Nucleotide frequency at the first and tenth nucleotide of the piRNA reads. Male cells: primordial germ cells (PGCs), spermatogonia cells (SPG), and spermatozoa (SPZ). Female cells: oocytes (OCY) and zygotes (ZYGO)

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