Figure 5

The majority of genes show the same XCI status in all informative sample sets. X-linked genes are mostly subject to XCI (red), show variable escape (purple) or escape from XCI (green) in all sample sets. Three classes of genes show a different XCI status in at least one informative sample set: population-specific XCI (orange), cell line-specific XCI (blue) and inconsistent XCI across the informative sample sets (white). At least five females were required to be informative in each informative sample set for a gene to be considered as differing between sample sets. Novel genes are included within the 'all genes’. The decision tree used to classify genes is shown in Additional file 13.