Figure 2

Transcriptional variation is balanced between X-linked genes and biallelically expressed autosomal genes (BAs), while the variation of monoallelically expressed autosomal genes (MAs) is higher than thatof BAs. (a) X chromosome:autosome (X/AA) mean transcriptional variation ratios were calculated for the mammalian cell lines noted at the bottom, and that of MAs versus BAs (MA/BA) was calculated for B-lympoblastoid, in which these MAs were identified. (b) Distribution histograms of BAs (blue bars), X-linked genes (red bars) and MAs (green-bars) at different gene expression levels with data from all the cell lines analyzed. X-linked genes and BAs are distributed symmetrically, while MAs are enriched in the low-expression regions.