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Table 1 Three candidate genes with differential methylation between low and high DEHP exposure in the screening

From: Effects of phthalate exposure on asthma may be mediated through alterations in DNA methylation

Gene gene ID

CpG island location

Assay details b

TSS position

Met% a (mean ± SD) of low and high DEHP exposure

AR (androgen receptor) (367)

ChrX: 66763684-66764077

Catalog number: 335002 EPHS115070-1A

SABiosciences CpG Island ID: 115070

CpG island location: ChrX: 66763684-66764077

Assay position (central point): ChrX: 66763921

PCR product size: 171

NCBI build number: 37

66763873

Low vs. high exposure:

 35.73 ± 31.76 vs. 14.95 ± 17.23

P = 0.071 by qPCR

TNFα (tumor necrosis factor α) 7124)

Chr6: 31543344-31544344

Catalog number: 335002MePH80050-1A

SABiosciences CpG Island ID: custom design

CpG island location: Chr6: 31543344-31544344

Assay position (central point): Chr6: 31543573

PCR product size: 294

(The sequence is in the Supplement)

NCBI build number: 37

31543350

Low vs. high exposure:

 42.65 ± 26.36 vs. 35.61 ± 27.13

P = 0.036 by qPCR

IL-4 (Interleukin-4) (16189)

Chr5: 132035956-132036176

Pyrosequence primer info:

 F:GTTGATTGGTTTTAAGTGATTGATAATT

 R:Biotin-ATACCAAATAAATACTCACCTTCTACT

 S:TTTTTGTTTTTTTTGTTAGTATGT

Sequence to analysis:

 GTYGGTAATTTTGTTTAYGGATATAAGTGYGATATTATTTTATAGGAGATTATTA

132040541

Low vs. high exposure:

 89.36 ± 3.58 vs. 89.36 ± 7.56

P = 0.249 by pyrosequencing

  1. aMet%: percentage of methylated cytosine in the CGIs; b AR and TNFα results were identified by EpiTect Methyl II qPCR assay. Since there was no commercial kit for IL-4 DNA methylation by qPCR, IL-4 results were obtained by pyrosequencing method via QIAGEN PyroMark Q24 instrument.