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ZebrafishVol. 17, No. 1
TechnoFish—MethodsFree Access


RAPID AND EFFICIENT LIVE ZEBRAFISH EMBRYO GENOTYPING

 * Xue Zhang, 
 * Zhaojunjie Zhang, 
 * Qinshun Zhao, and 
 * Xin Lou

Xue Zhang

Model Animal Research Centre, Nanjing University, Nanjing, China.

*These authors contributed equally to this work.

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, 
Zhaojunjie Zhang

Model Animal Research Centre, Nanjing University, Nanjing, China.

*These authors contributed equally to this work.

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, 
Qinshun Zhao

Model Animal Research Centre, Nanjing University, Nanjing, China.

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, and 
Xin Lou

Address correspondence to: Xin Lou, PhD, Model Animal Research Centre, Nanjing
University, Room 403B, 12 Xuefu Road, Nanjing 210093, China

E-mail Address: xin.lou@nju.edu.cn



Model Animal Research Centre, Nanjing University, Nanjing, China.

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Published Online:28 Jan 2020https://doi.org/10.1089/zeb.2019.1796
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ABSTRACT

Most current methods for genotyping zebrafish embryos require sacrifice or
raising the animal to at least 1 month of age for fin amputation. These
limitations restrict the use of zebrafish and increase time and costs for
experiments. This article introduces an innovative method for genotyping live
zebrafish embryos. The method utilizes enzyme to extract a small amount of
genetic material from the skin tissue of the embryo. Then, using conventional
polymerase chain reaction (PCR) strategy, the embryo is genotyped. This approach
was successful >95% of the time while maintaining high viability (>90%) of the
embryo. This effective method can facilitate high-throughput screening and other
applications in zebrafish.



As a powerful vertebrate model system, zebrafish is being widely used in
research fields ranging from developmental biology, disease modeling, and drug
discovery. One of the advantages of zebrafish as a model is its amenability to
genetic manipulation, which has been dramatically improved with recently
developed genetic tools such as clustered regularly interspaced short
palindromic repeats (CRISPR) technology. However, using current methods for
genotyping zebrafish, embryos must be sacrificed; or fish must be raised to at
least 1 month old to have a fin clip collected.1 Methods have been described for
genotyping of live embryos; however, these require special instruments2,3 or
tedious surgical procedures.4,5 These limitations increase time and cost for
experiments and prohibit larger-scale phenotypic screens. Methods to enable fast
genotyping of live zebrafish embryos in a high-throughput manner would have
extensive applicability and practical significance.

As the zebrafish embryo has a remarkable capacity to regenerate, we set out to
establish a cost-efficient live embryo genotyping method based on limited
proteinase digestion. First, we tested the DNA extraction ability of different
types of proteinases on 72 h postfertilization (hpf) embryos in embryo culture
medium. To enhance the digestion efficacy, the samples were incubated at 37°C
and constantly mixed on a multiwell plate shaker (Fig. 1A). The results showed
both pronase and proteinase K could release DNA from embryo skin tissue, with
embryos treated by proteinase K showing higher viability. We, therefore,
optimized the procedure with proteinase K (Supplementary Fig. S1A). To further
improve the genotyping sensitivity, we prepared four different types of buffer
after literature review and compared the DNA extraction efficiency and embryo
viability for each. The results showed that when using 30 mM Tris (pH8.0),
genotyping polymerase chain reaction (PCR) could be successfully performed in
90% of samples, with a 90% survival rate of genotyped embryos (Fig. 1B and
Supplementary Fig. S1B). For applications, including drug screens, mutant
genotyping, and genetic screens, researchers require genotype information as
rapidly as possible. To minimize the damage of enzyme treatment to the early
stage embryo, we optimized the concentration of proteinase K, treatment time,
and shaking speed for embryos from 24 to 96 hpf (Supplementary Fig. S1C–F) and
listed the recommended treatment conditions in a detailed protocol
(Supplementary Data). To test the quality of DNA obtained from the method, we
deployed PCR for a variety of amplicon and DNA sequences, and found that up to
1.2 kb could be successfully amplified (Fig. 1C and Supplementary Table S1). We
also assessed the possible adverse effects of the treatment on larva behavior,
fish survival, and fecundity (Supplementary Fig. S2), with no significant
effects observed.

FIG. 1. Rapid and efficient live zebrafish embryo genotyping. (A) The step
procedure for the method. (B) Representative image of genotyped zebrafish larva
at 7 dpf. Lateral view, head to left. (C) Representative PCR results. dpf, days
postfertilization; NC, negative control; PC, positive control; PCR, polymerase
chain reaction.

To further enhance the throughput of this method, we established a two-round
procedure. At 48 hpf, up to eight embryos could be pooled into 1 well of a
24-well plate, and the mixed DNA was prepared and tested in first-round
genotyping. The embryos from positive pools were cultured to allow recovery. At
96 hpf, these embryos were individually re-genotyped (Supplementary Fig. S3).
This procedure (see note in the protocol) is suitable for genotyping screens
especially those with a low germline transmission rate (such as
CRISPR/Cas9-mediated knock-in, base-editing, and large fragment deletion), such
that up to 800 embryos could be processed by one person in one round of
genotyping.

Our results show that this method provides a fast, cost-efficient, and
high-throughput compatible solution to genotyping live zebrafish embryos. The
genetic material obtained from this method is suitable for detecting SNPs,
transgenes, and mutations, including single base-pair changes, insertions, or
deletions. To our knowledge, this is the first report of a limited digestion
method and could facilitate the use of zebrafish embryos in biomedical research.


ETHICS APPROVAL

Zebrafish were housed and handled as per Nanjing University Laboratory Animal
Services guidelines. All the protocols involving the use of animals were in
accordance with approved guidelines of the Institutional Animal Care and Use
Committee of the Nanjing University.


ACKNOWLEDGMENTS

We thank Prof. Ian C. Scott at University of Toronto, for help in editing the
article, and members of Di Chen Laboratory at Nanjing University, for the help
during this project.


AUTHORS' CONTRIBUTIONS

X.L. and Q.Z. conceived and supervised the project. X.Z. and Z.Z. performed
experiments and analyzed the data. X.L. wrote the article.


DISCLOSURE STATEMENT

No competing financial interests exist.


FUNDING INFORMATION

This research was undertaken, in part, thanks to grant funding from National
Natural Science Foundation of China (NSFC 31671505 and 31970765 to X.L).


SUPPLEMENTARY MATERIAL

Supplementary Data

Supplementary Figure S1

Supplementary Figure S2

Supplementary Figure S3

Supplementary Table S1


 * Figures
 * References
 * Related
 * Details


REFERENCES

 * 1. Parant JM, George SA, Pryor R, Wittwer CT, Yost HJ. A rapid and efficient
   method of genotyping zebrafish mutants. Dev Dyn 2009;238:3168–3174. Crossref,
   Medline, Google Scholar
 * 2. Samuel R, Stephenson R, Roy P, Pryor R, Zhou L, Bonkowsky JL, et al.
   Microfluidic-aided genotyping of zebrafish in the first 48 h with 100%
   viability. Biomed Microdevices 2015;17:43. Crossref, Medline, Google Scholar
 * 3. Lambert CJ, Freshner BC, Chung A, Stevenson TJ, Bowles DM, Samuel R, et
   al. An automated system for rapid cellular extraction from live zebrafish
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   High-throughput DNA extraction and genotyping of 3dpf zebrafish larvae by fin
   clipping. J Vis Exp 2018. DOI: 10.3791/58024. Crossref, Medline, Google
   Scholar

 * Cited by
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      27 March 2023 | PLOS Genetics, Vol. 19, No. 3
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      14 December 2022 | Development, Vol. 149, No. 24
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      30 December 2022 | Scientific Reports, Vol. 12, No. 1
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      21 November 2022 | eLife, Vol. 11
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      28 July 2021 | Scientific Reports, Vol. 11, No. 1
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      6 May 2020 | Frontiers in Molecular Biosciences, Vol. 7

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Volume 17Issue 1
Feb 2020
Information

Copyright 2020, Mary Ann Liebert, Inc., publishers

--------------------------------------------------------------------------------

To cite this article:
Xue Zhang, Zhaojunjie Zhang, Qinshun Zhao, and Xin Lou.Rapid and Efficient Live
Zebrafish Embryo Genotyping.Zebrafish.Feb
2020.56-58.http://doi.org/10.1089/zeb.2019.1796
 * Published in Volume: 17 Issue 1: January 28, 2020
 * Online Ahead of Print:December 17, 2019

Keywords
 * basic protocol
 * genotyping
 * zebrafish
 * mutation
 * transgenes

--------------------------------------------------------------------------------

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