PGC7 suppresses TET3 for protecting DNA methylation.

Area of Science:

• Epigenetics and Molecular Biology
• DNA Methylation Regulation

Background:

• Ten-eleven translocation (TET) family enzymes are crucial for converting 5-methylcytosine to 5-hydroxylmethylcytosine.
• The precise molecular mechanisms regulating TET enzyme activity remain incompletely understood.

Purpose of the Study:

• To elucidate the regulatory mechanism of TET enzyme activity.
• To investigate the role of PGC7 (also known as Dppa3 or Stella) in DNA methylation maintenance.

Main Methods:

• In vitro and in vivo interaction studies between PGC7 and TET2/TET3.
• Analysis of DNA methylation status in PGC7-deficient models.
• Genome-wide PGC7-binding motif identification.

Main Results:

• PGC7 directly interacts with TET2 and TET3, inhibiting their enzymatic activity.
• Absence of PGC7 results in significant DNA hypomethylation at imprinted loci.
• PGC7 recognizes a specific DNA motif, and associated CpG islands are hypermethylated.

Conclusions:

• PGC7 acts as a suppressor of TET enzyme activity, thereby protecting DNA methylation.
• This study reveals a novel molecular mechanism for PGC7 in safeguarding DNA methylation against TET-mediated oxidation.