Genetic and epigenetic mechanisms combine to control MMP1 expression and its association with preterm premature rupture of membranes.

Abstract:

:Degradation of fibrillar collagens is believed to be involved in the rupture of the fetal membranes during normal parturition and when the membranes rupture prematurely. Matrix metalloproteinase 1 (MMP1) is a key enzyme involved in extracellular matrix turnover, and genetic variation in the MMP1 promoter is associated with the risk of preterm premature rupture of membranes (PPROM). We determined whether epigenetic factors contribute to the control of MMP1 expression in the human amnion. Inhibition of DNA methylation with 5-aza-2'-deoxycytidine in amnion fibroblasts resulted in significantly increased MMP1 gene transcription, and an associated significant increase in MMP1 production. These effects were correlated with reduced DNA methylation at a particular site (-1538) in the MMP1 promoter. DNA methylation at this site in amnion was reduced in a larger percentage of fetal membranes that ruptured prematurely. A new T > C single nucleotide polymorphism (SNP) [AF007878.1 (MMP1):g.3447T>C] in the MMP1 promoter was also identified. The minor C allele was always methylated in vivo, and when methylated, resulted in increased affinity for a nuclear protein in amnion fibroblasts. The minor C allele had reduced promoter activity as assessed by plasmid transfection studies and chromatin immunoprecipitation assays using amnion fibroblasts heterozygous for the T > C SNP. In a case-control study, the minor C allele was found to be protective against PPROM, consistent with its reduced promoter function. We conclude that in addition to genetic variation, DNA methylation plays a role in controlling MMP1 expression and risk of an adverse obstetrical outcome.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Wang H,Ogawa M,Wood JR,Bartolomei MS,Sammel MD,Kusanovic JP,Walsh SW,Romero R,Strauss JF 3rd

doi

10.1093/hmg/ddm381

subject

Has Abstract

pub_date

2008-04-15 00:00:00

pages

1087-96

issue

8

eissn

0964-6906

issn

1460-2083

pii

ddm381

journal_volume

17

pub_type

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