A role for DNA polymerase θ in promoting replication through oxidative DNA lesion, thymine glycol, in human cells

Jung Hoon Yoon, Jayati Roy Choudhury, Jeseong Park, Satya Prakash, Louise Prakash

Research output: Contribution to journalArticle

31 Scopus citations


The biological functions of human DNA polymerase (pol) θ, an A family polymerase, have remained poorly defined. Here we identify a role of polθ in translesion synthesis (TLS) in human cells.Weshow that TLS through the thymine glycol (TG) lesion, the most common oxidation product of thymine, occurs via two alternative pathways, in one of which, polymerases κ and ζ function together and mediate error-free TLS, whereas in the other, polθ functions in an error-prone manner. Human polθ is comprised of an N-terminal ATPase/helicase domain, a large central domain, and a C-terminal polymerase domain; however, we find that only the C-terminal polymerase domain is required for TLS oppositeTGinhumancells. In contrast to TLS mediated by polα and polζ, in which polζ would elongate the chain from the TG:A base pair formed by polθ action, the ability of polθ alone to carry out the nucleotide insertion step, as well as the subsequent extension step that presents a considerable impediment due to displacement of the 5' template base, suggests that the polθ active site can accommodate highly distorting DNA lesions.

Original languageEnglish (US)
Pages (from-to)13177-13185
Number of pages9
JournalJournal of Biological Chemistry
Issue number19
StatePublished - Jan 1 2014


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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