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Published on: May 19, 2013
dRecQ4 is required for DNA synthesis and essential for cell proliferation in Drosophila
Yanjuan Xu1, Zhiyong Lei, Hai Huang
1State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, the Chinese Academy of Sciences, Beijing, China.
Background:
The family of RecQ DNA helicases plays an important role in the maintenance of genomic integrity. Mutations in three of the five known RecQ family members in humans, BLM, WRN and RecQ4, lead to disorders that are characterized by predisposition to cancer and premature aging.
Methodology/Principal Findings:
To address the in vivo functions of Drosophila RecQ4 (dRecQ4), we generated mutant alleles of dRecQ4 using the targeted gene knock-out technique. Our data show that dRecQ4 mutants are homozygous lethal with defects in DNA replication, cell cycle progression and cell proliferation. Two sets of experiments suggest that dRecQ4 also plays a role in DNA double strand break repair. First, mutant animals exhibit sensitivity to gamma irradiation. Second, the efficiency of DsRed reconstitution via single strand annealing repair is significantly reduced in the dRecQ4 mutant animals. Rescue experiments further show that both the N-terminal domain and the helicase domain are essential to dRecQ4 function in vivo. The N-terminal domain is sufficient for the DNA repair function of dRecQ4.
Conclusions/Significance:
Together, our results show that dRecQ4 is an essential gene that plays an important role in not only DNA replication but also DNA repair and cell cycle progression in vivo.
Insights
Drosophila RecQ4 (dRecQ4) is essential for genomic stability, impacting DNA replication, cell cycle, and repair. Its loss causes lethality, highlighting its critical role in maintaining DNA integrity.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- RecQ DNA helicases are crucial for maintaining genomic integrity.
- Human RecQ helicase mutations are linked to cancer predisposition and premature aging.
Purpose of the Study:
- To investigate the in vivo functions of Drosophila RecQ4 (dRecQ4).
Main Methods:
- Generated mutant alleles of dRecQ4 using targeted gene knock-out.
- Assessed dRecQ4 mutant phenotypes including lethality, DNA replication, cell cycle progression, and DNA repair.
- Performed rescue experiments to determine functional domains.
Main Results:
- dRecQ4 mutants exhibit homozygous lethality with defects in DNA replication, cell cycle progression, and proliferation.
- Mutant animals show sensitivity to gamma irradiation, indicating a role in DNA double-strand break repair.
- Single-strand annealing repair efficiency is reduced in dRecQ4 mutants.
- Both N-terminal and helicase domains are essential for dRecQ4 function; the N-terminal domain is sufficient for DNA repair.
Conclusions:
- dRecQ4 is an essential gene in Drosophila.
- dRecQ4 plays critical roles in DNA replication, DNA repair, and cell cycle progression in vivo.
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