Methylation patterns in (A) C1ql3 (full gene shown)
and (B) Srd5a2 (only 5′ region shown). The
5′ regions of both genes harbor CpG islands (CGI; shown as green block)
that undergo progressive increase in methylation with age (Bonferroni p <
0.05). Number of mice per age group are young = 4, mid = 4, old
= 3. Combined read coverage is depicted for young (yellow), mid (green),
and old mice (maroon). Horizontal bars below the coverage map show the aligned
read fragments. These CGIs are conserved in humans and are targeted by CpG
probes in the Illumina Infinium HumanMethylation450K BeadChips. Most show
significant positive correlation with age in human liver tissue and correlation
between age and example probes for C1QL3 (Pearson R =
0.66, p-value < 0.0001) (C) and SRD5A2 C1QL3
(Pearson R = 0.44, p-value < 0.0001) (D) are shown.