Efficient genome-wide mutagenesis of zebrafish genes by retroviral insertions

doi:10.1073/pnas.0705502104

Efficient genome-wide mutagenesis of zebrafish genes by retroviral insertions

*Key Laboratory of Cell Proliferation and Differentiation, Center of Developmental Biology and Genetics, College of Life Sciences, Peking University, Ministry of Education, Beijing 100871, China;
^†Genome Technology Branch, National Human Genome Research Institute, Bethesda, MD 20892-8004;
^‡Laboratory of Molecular Technology, National Cancer Institute, SAIC, Frederick, MD 21701; and
^¶Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA 90095

Communicated by Nancy Hopkins, Massachusetts Institute of Technology, Cambridge, MA, June 13, 2007 (received for review April 17, 2007)

Abstract

Using a combination of techniques we developed, we infected zebrafish embryos using pseudotyped retroviruses and mapped the genomic locations of the proviral integrations in the F₁ offspring of the infected fish. From F₁ fish, we obtained 2,045 sequences representing 933 unique retroviral integrations. A total of 599 were mappable to the current genomic assembly (Zv6), and 233 of the integrations landed within genes. By inbreeding fish carrying proviral integrations in 25 different genes, we were able to demonstrate that in ≈50% of the gene “hits,” the mRNA transcript levels were reduced by ≥70%, with the highest probability for mutation occurring if the integration was in an exon or first intron. Based on these data, the mutagenic frequency for the retrovirus is nearly one in five integrations. In addition, a strong mutagenic effect is seen when murine leukemia virus integrates specifically in the first intron of genes but not in other introns. Three of 19 gene inactivation events had embryonic defects. Using the strategy we outlined, it is possible to identify 1 mutagenic event for every 30 sequencing reactions done on the F₁ fish. This is a 20- to 30-fold increase in efficiency when compared with the current resequencing approach [targeting induced local lesions in genomes (TILLING)] used in zebrafish for identifying mutations in genes. Combining this increase in efficiency with cryopreservation of sperm samples from the F₁ fish, it is now possible to create a stable resource that contains mutations in every known zebrafish gene.

Footnotes

^§To whom correspondence may be addressed. E-mail: bzhang{at}pku.edu.cn, shuolin{at}ucla.edu, or burgess{at}mail.nih.gov
Author contributions: D.W. and L.-E.J. contributed equally to this work; D.W., L.-E.J., X.W., Z.Z., B.Z., S.L., and S.M.B. designed research; D.W., L.-E.J., N.Z., K.D., J.I., S.Z., X.W., K.W., H.Y., and Q.M. performed research; D.W., L.-E.J., Z.Z., and S.M.B. contributed new reagents/analytic tools; D.W., L.-E.J., B.Z., S.L., and S.M.B. analyzed data; and D.W., L.-E.J., B.Z., S.L., and S.M.B. wrote the paper.
The authors declare no conflict of interest.
Data deposition: The sequences reported in this paper have been deposited in the GenBank database (accession nos. EF681140–EF681618).
This article contains supporting information online at www.pnas.org/cgi/content/full/0705502104/DC1.
↵ ‖ Short (<18 bp) linker-only, and ambiguous sequences are excluded.
↵ ** The percentage is expected to be close to 40% because of multiple genes affected by a single integration.
Abbreviations:

ENU,

ethylnitrosourea;

TILLING,

targeting induced local lesions in genomes;

MLV,

murine leukemia virus;

qPCR,

quantitative PCR;

EAV,

embryo assay value;

LM-PCR,

linker-mediated PCR.
Freely available online through the PNAS open access option.