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Identification of Low-molecular-weight Vitellogenin 1 (Vg1)-like Proteins As Nucleotide Excision Repair (NER) Factors in Developing Zebrafish (Danio Rerio) Using a Transcription-based DNA Repair Assay

Overview
Specialty Biochemistry
Date 2017 Jan 12
PMID 28074418
Citations 1
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Abstract

Nucleotide excision repair (NER) removes helix-distorting DNA lesions such as UV-induced pyrimidine dimers and cisplatin-induced strand crosslinking. Our earlier studies have identified low-molecular-weight proteins homologous to the 150-kDa vitellogenin 1 (Vg1) as UV-damaged DNA-binding factors expressed in developing zebrafish (Danio rerio). This present study explored if Vg1-like proteins also participated in NER in zebrafish. Immunoblot analysis of affinity-captured 12 h post-fertilization (hpf) zebrafish extract proteins showed a transient binding of a 30-kDa Vg1-like polypeptide to UV-damaged DNA. A transcription-based in vitro repair assay revealed a significant up-regulation of UVC or cisplatin-suppressed transcriptional activity of a marker cDNA driven by a SP6 RNA polymerase-regulated promotor after incubating the damaged plasmid with the extracts of 12 hpf embryos or 96 hpf larvae. The up-regulation of UV or cisplatin-suppressed transcription was abolished in the presence of a monoclonal anti-zebrafish Vg1 antibody. The differential sensitivity of UV-induced repair in 12 and 96 hpf zebrafish extracts to exogenous ATP suggested a development-dependent expression of Vg1-like NER factors. A T endonuclease V digestion assay showed no inhibition of the anti-Vg1 antibody on the excision of UV-induced cyclobutane pyrimidine dimers. Our results identified the participation of Vg1-like factors in NER in developing zebrafish, and these factors may function at post-incison steps of NER.

Citing Articles

DNA repair genes play a variety of roles in the development of fish embryos.

Dey A, Flajshans M, Psenicka M, Gazo I Front Cell Dev Biol. 2023; 11:1119229.

PMID: 36936683 PMC: 10014602. DOI: 10.3389/fcell.2023.1119229.

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