Single/low-copy integration of transgenes in Caenorhabditis elegans using an ultraviolet trimethylpsoralen method.

Single/low-copy integration of transgenes in Caenorhabditis elegans using an ultraviolet trimethylpsoralen method.
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DOI:
10.1186/1472-6750-12-1
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发表时间:
2012-01-05
期刊:
影响因子:
3.5
通讯作者:
Mitani S
Mitani S
中科院分区:
工程技术3区
文献类型:
--
作者:
Kage-Nakadai E;Kobuna H;Funatsu O;Otori M;Gengyo-Ando K;Yoshina S;Hori S;Mitani S

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Transgenic strains of Caenorhabditis elegans are typically generated by injecting DNA into the germline to form multi-copy extrachromosomal arrays. These transgenes are semi-stable and their expression is silenced in the germline. Mos1 transposon or microparticle bombardment methods have been developed to create single- or low-copy chromosomal integrated lines. Here we report an alternative method using ultraviolet trimethylpsoralen (UV/TMP) to generate single/low-copy gene integrations. We successfully integrated low-copy transgenes from extrachromosomal arrays using positive selection based on temperature sensitivity with a vps-45 rescue fragment and negative selection based on benzimidazole sensitivity with a ben-1 rescue fragment. We confirmed that the integrants express transgenes in the germline. Quantitative PCR revealed that strains generated by this method contain single- or low-copy transgenes. Moreover, positive selection marker genes flanked by LoxP sites were excised by Cre recombinase mRNA microinjection, demonstrating Cre-mediated chromosomal excision for the first time in C. elegans. Our UV/TMP integration method, based on familiar extrachromosomal transgenics, provides a useful approach for generating single/low-copy gene integrations.
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