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2017 ; 3
(3
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Trichloroethylene-induced alterations in DNA methylation were enriched in
polycomb protein binding sites in effector/memory CD4(+) T cells
#MMPMID29129997
Gilbert KM
; Blossom SJ
; Reisfeld B
; Erickson SW
; Vyas K
; Maher M
; Broadfoot B
; West K
; Bai S
; Cooney CA
; Bhattacharyya S
Environ Epigenet
2017[Jul]; 3
(3
): ä PMID29129997
show ga
Exposure to industrial solvent and water pollutant trichloroethylene (TCE) can
promote autoimmunity, and expand effector/memory (CD62L) CD4(+) T cells. In order
to better understand etiology reduced representation bisulfite sequencing was
used to study how a 40-week exposure to TCE in drinking water altered methylation
of ?337 770 CpG sites across the entire genome of effector/memory CD4(+) T cells
from MRL+/+ mice. Regardless of TCE exposure, 62% of CpG sites in autosomal
chromosomes were hypomethylated (0-15% methylation), and 25% were hypermethylated
(85-100% methylation). In contrast, only 6% of the CpGs on the X chromosome were
hypomethylated, and 51% had mid-range methylation levels. In terms of TCE impact,
TCE altered (? 10%) the methylation of 233 CpG sites in effector/memory CD4(+) T
cells. Approximately 31.7% of these differentially methylated sites occurred in
regions known to bind one or more Polycomb group (PcG) proteins, namely Ezh2,
Suz12, Mtf2 or Jarid2. In comparison, only 23.3% of CpG sites not differentially
methylated by TCE were found in PcG protein binding regions. Transcriptomics
revealed that TCE altered the expression of ?560 genes in the same
effector/memory CD4(+) T cells. At least 80% of the immune genes altered by TCE
had binding sites for PcG proteins flanking their transcription start site, or
were regulated by other transcription factors that were in turn ordered by PcG
proteins at their own transcription start site. Thus, PcG proteins, and the
differential methylation of their binding sites, may represent a new mechanism by
which TCE could alter the function of effector/memory CD4(+) T cells.