Biology:Prime editing

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Prime editing is a 'search-and-replace' genome editing technology in molecular biology by which the genome of living organisms may be modified. The technology directly writes new genetic information into a targeted DNA site. It uses a fusion protein, consisting of a catalytically impaired Cas9 endonuclease fused to an engineered reverse transcriptase enzyme, and a prime editing guide RNA (pegRNA), capable of identifying the target site and providing the new genetic information to replace the target DNA nucleotides. It mediates targeted insertions, deletions, and base-to-base conversions without the need for double strand breaks (DSBs) or donor DNA templates.[1]

The technology has received mainstream press attention due to its potential uses in medical genetics. It utilizes methodologies similar to precursor genome editing technologies, including CRISPR/Cas9 and base editors. Prime editing has been used on some animal models of genetic disease[2][3][4] and plants.[5] In 2024, PM359, a gene therapy developed by Prime Medicine, became the first prime editor to enter clinical trials for human use.[6] Prime Medicine reported in December 2025 that two chronic granulomatous disease patients treated with PM359 had been "effectively cured"[7] of the disease.[8]

Components

Cas9 prime editors

Major components

Components of prime editing

Prime editing involves three major components:

  • Prime editing guide RNA (pegRNA): capable of (i) identifying the target nucleotide sequence to be edited, and (ii) encoding new genetic information that replaces the targeted sequence. The pegRNA consists of an extended single guide RNA (sgRNA) containing a primer binding site (PBS) and a reverse transcriptase (RT) template sequence. During genome editing, the primer binding site allows the 3' end of the nicked DNA strand to hybridize to the pegRNA, while the RT template serves as a template for the synthesis of edited genetic information.[1]
  • Cas9 nickase: With the exclusion of certain variants, all Cas9 prime editors use a nickase.[9][10][11][12] Normally, Cas9 is a nuclease, slicing DNA in half to make blunt-ended double-stranded breaks. The protein uses two domains to do this. The HNH domain cleaves the target strand, the strand of DNA bound to guide RNA, and the RuvC domain cleaves the non-target strand, the target strand's compliment. By swapping the protein's 840th amino acid from a histidine to an alanine, the HNH domain is prevented from cutting. This generates a H840A nickase which can only make a single-stranded break (a nick) in the non-target strand.[13] Most prime editors use a H840A nickase, but inverse prime editors take an opposite approach, instead using a D10A nickase.[14] Here, the 10th amino acid is changed from aspartic acid to alanine This prevents RuvC from functioning but preserves the HNH domain.[13]
  • Reverse transcriptase: an enzyme that synthesizes DNA from a single-stranded RNA template.[1]

Accessory components

Certain editors have various accessory components:

Cas12 prime editors

Main components

Cas12 prime editing involves five major components:[19]

Accessory components

  • additional crRNA:[19]

Editing mechanism

Prime editing mechanism

Original (used by PE1 and 2)

Genomic editing takes place by transfecting cells with the pegRNA and the fusion protein. Transfection is often accomplished by introducing vectors into a cell. Once internalized, the fusion protein nicks the target DNA sequence, exposing a 3'-hydroxyl group that can be used to initiate (prime) the reverse transcription of the RT template portion of the pegRNA. This results in a branched intermediate that contains two DNA flaps: a 3' flap that contains the newly synthesized (edited) sequence, and a 5' flap that contains the dispensable, unedited DNA sequence. The 5' flap is then cleaved by structure-specific endonucleases or 5' exonucleases. This process allows 3' flap ligation, and creates a heteroduplex DNA composed of one edited strand and one unedited strand. The reannealed double stranded DNA contains nucleotide mismatches at the location where editing took place. In order to correct the mismatches, the cells exploit the intrinsic mismatch repair (MMR) mechanism, with two possible outcomes: (i) the information in the edited strand is copied into the complementary strand, permanently installing the edit; (ii) the original nucleotides are re-incorporated into the edited strand, excluding the edit.[1]

PE3 system for prime editing

PE3 strategy

Despite its increased efficacy, the edit installed by PE2 might still be removed by mismatch repair of the edited strand. To counter this, the Prime Editor 3 strategy comes with an extra component borrowed from base editing. In addition to the editor itself, PE3 uses a standard Cas9 nickase to exploit DNA repair systems by targeting the opposite non-edited strand. Following the nick on the non-edited strand, DNA repair will use the edited strand as a template, consequentially improving the odds of success.[1]

However, there are drawbacks to this system as the unaltered strand can be nicked prematurely and lead to additional undesired indels.[15]

Paired prime editing

HOPE strategy: use two complimentary guide RNA pairs to increase chances of edit inclusion (just like Rin and Len guys!)[20][more detail needed]

PE4 and 5 strategies

Prime editor 4 utilizes the same machinery as PE2, but also includes a plasmid that encodes for dominant negative MMR protein MLH1. Dominant negative MLH1 is able to essentially knock out endogenous MLH1 by inhibition, thereby reducing cellular MMR response and increasing prime editing efficiency.[15][more detail needed]

Prime editor 5 utilizes the same machinery as PE3, but also includes a plasmid that encodes for dominant negative MLH1. Like PE4, this allows for a knockdown of endogenous MMR response, increasing the efficiency of prime editing.[15][more detail needed]

Twin prime editing

The "twin prime editing" (twinPE) mechanism reported in 2021 allows editing large sequences of DNA – sequences as large as genes – which addresses the method's key drawback. It uses a prime editor protein and two prime editing guide RNAs.[21][22][more detail needed]

PASTE

Drag and drop using an Integrase[23][more detail needed]

PASSIGE

Performs way better than PASTE[24][more detail needed]

pegRNA improvements and modifications

Engineered pegRNA (epegRNA)

Prime editing efficiency can be increased with the use of engineered pegRNAs (epegRNAs). One common issue with traditional pegRNAs is degradation of the 3' end, leading to decreased PE efficiency. epegRNAs have a structured RNA motif added to their 3' end to prevent degradation.[25][more detail needed]

Xrn1 resistant pegRNA (xr-pegRNA)

[26][more detail needed]

Addition of an RNA G-quadruplex

[27][more detail needed]

Split pegRNA with a MS2 stem-loop aptamer

[28][more detail needed]

Engineered non-canonical pegRNAs (npegRNA)

[29][more detail needed]

Structural improvements and modifications

Prime editing was developed in the lab of David R. Liu at the Broad Institute and disclosed in Anzalone et al. (2019).[30] Since then prime editing and the research that produced it have received widespread scientific acclaim,[31][32][1] being called "revolutionary"[33] and an important part of the future of editing.[30] During the development of this technology, several modifications were done to the components, in order to increase its effectiveness.[1]

In animals

Prime editor 1 (PE1)

Prime editor 1 was a prototype designed to have the minimum components necessary. It consisted of a wild-type Moloney murine leukemia virus (M-MLV) reverse transcriptase attached to Cas9 H840A nickase by a flexible protein linker. Originally, the linker was too short and the reverse transcriptase was unable to do its job. However, extending it to 8-15 bases led to detectable editing. During development, the linker was attached to either the C- or N-terminal of the Cas9 protein. Linkage the C terminal proved more efficient, so it was chosen as the final design. Detectable editing efficiencies were observed.[1]

Prime editor 2 (PE2)

After the success of PE1, researchers chose to modify its reverse transcriptase. This was done to improve DNA synthesis and thus the editor's overall efficiency. They started by searching the literature for previously described mutations. These were found to improve the enzyme's thermostability, processivity, DNA to RNA substrate affinity, or prevent interference by RNaseH. A variety of mutations were combined into nineteen different variants and then tested against each other in human cells.[1]

Researchers began by focusing on thermal stability. They found that a reverse transcriptase combining D200N, L603W, and T330P mutations improved editing efficiency by an average of 6.8-fold for insertions and transversions at five different sites. Following this, the mutant transcriptase was further combined with additional mutations. Adding T306K and W313F improved editing efficiency by an additional 1.3 to 3-fold for insertions or transversions at the same five sites. The resulting prime editor was deemed PE2.[1]

Prime Editor 2 had a substantially higher efficiency than its predecessor when making insertion, deletion, or substitution mutations. Additionally, it was compatible with a shorter primer binding site (PBS) sequence due to its enhanced substrate affinity.[1]

PE2*

better PE2 with enhanced nuclear localization sequences[34][more detail needed]

HyPE2

[35][more detail needed]

PAM flexible prime editors

[36][more detail needed]

CMP-PE-V1

[37][more detail needed]

PEmax

PEmax was created to further enhance the improvements made in PE2. To do this, researchers tested twenty-one PE2 variants with different Cas9 mutations, reverse transcriptase codon usages, nuclear localization sequences (NLS), protein linker lengths, and protein linker compositions. Out of the twenty-one created, an editor with a human-optimized reverse transcriptase, Cas9 with the nucelase enhancing R221K and N394K mutations, 34-aa linker with a bipartite SV40 NLS, and an additional c-Myc NLS at the protein's C-terminal emerged most successful.[38]

Afterwards, the resulting protein (dubbed PEmax) was pitted against other improved prime editors. All were tested on HeLa cells and performed various modifications at seven genomic sites. Notable competitors included PE2*, which has additional NLS sequences, and CMP–PE–V1, which contains high-mobility peptides. PEmax outperformed both at 6/7 sites, with the time it lost to PE2* being within the margin of error.[38]

While improvements vary by cell line and modification, PEmax can be combined with various strategies (PE2max, PE3max, PE4max, PE5max) as well as epegRNA to dramatically enhance editing efficiency. However, note that combining PEmax with PE3 or PE5 leads to a slight increase in indels. This is likely due to the editor's increased nicking ability.[38]

IN-PE2

[39][more detail needed]

Split prime editors

[40][17][18][41][more detail needed]

Nuclease prime editors

Nuclease Prime Editor uses Cas9 nuclease instead of Cas9(H840A) nickase. Unlike prime editor 3 (PE3) that requires dual-nick at both DNA strands to induce efficient prime editing, Nuclease Prime Editor requires only a single pegRNA since the single-gRNA already creates double-strand break instead of single-strand nick.[9][more detail needed]

further research done[10][more detail needed]

another study[11][more detail needed]

upgraded version[12][more detail needed]

Prime editor 6 (PE6)

Smaller than normal. There are multiple variants that can be used in different applications (a,b,c,d)[42][more detail needed]

Miniature CjCas9 prime editor (mini-PE)

[43][more detail needed]

Cas12a prime editors

[19][more detail needed]

Prime editor 7 (PE7)

[16][more detail needed]

Inverse prime editors (iPE and ciPE)

[14][more detail needed]

Very precise prime editor (vPE)

[44][more detail needed]

In plants

In fungi

Yeast-improved prime editor (PE_Y18)

[45][more detail needed]

In bacteria

Applications

Cell cultures

Animal models

Efficient prime editing in mouse brain,liver and heart with dual AAVs[46][more detail needed]

zebrafish[47][more detail needed]

Agriculture

PE is among recently introduced technologies which allow the transfer of single-nucleotide polymorphisms (SNPs) from one individual crop plant to another. PE is precise enough to be used to recreate an arbitrary SNP in an arbitrary target,[31] including deletions, insertions, and all 12 point mutations without also needing to perform a double-stranded break or carry a donating template.[32]

Ultra-efficient tomato prime editor[48][more detail needed]

rice[49][more detail needed]

Gene therapy

Other

Prime editors may be used in gene drives. A prime editor may be incorporated into the Cleaver half of a Cleave and Rescue ClvR system. In this case it is not meant to perform a precise alteration but instead to merely disrupt.[50][more detail needed]

Methods of delivery

Base editors used for prime editing require delivery of both a protein and RNA molecule into living cells. Introducing exogenous gene editing technologies into living organisms is a significant challenge. One potential way to introduce a base editor into animals and plants is to package the base editor into a viral capsid. The target organism can then be transduced by the virus to synthesize the base editor in vivo. Common laboratory vectors of transduction such as lentivirus cause immune responses in humans, so proposed human therapies often centered around adeno-associated virus (AAV) because AAV infections are largely asymptomatic. Unfortunately, the effective packaging capacity of AAV vectors is small, approximately 4.4kb not including inverted terminal repeats.[51] As a comparison, an SpCas9-reverse transcriptase fusion protein is 6.3kb,[1][52] which does not even account for the lengthened guide RNA necessary for targeting and priming the site of interest. However, successful delivery in mice has been achieved by splitting the editor into two AAV vectors[2][3][4][53] or by using an adenovirus,[3] which has a larger packaging capacity.

Comparison to base editors and traditional CRISPR Cas9 genome editing

Although additional research is required to improve the efficiency of prime editing, the technology offers promising scientific improvements over other gene editing tools. The prime editing technology has the potential to correct the vast majority of pathogenic alleles that cause genetic diseases, as it can repair insertions, deletions, and nucleotide substitutions.[1]

Advantages

The prime editing tool offers advantages over traditional gene editing technologies. CRISPR/Cas9 edits rely on double-strand breaks and non-homologous end joining (NHEJ) or homology-directed repair (HDR) to fix DNA breaks, while the prime editing system employs single-strand breaks and DNA mismatch repair. This is an important feature of this technology given that DNA repair mechanisms such as NHEJ and HDR, generate unwanted, random insertions or deletions (indels). These are byproducts that complicate the retrieval of cells carrying the correct edit.[1][54] Prime editors do not frequently create these indel byproducts, suggesting that prime editors can be more precise than earlier tools.

The prime editing system introduces single-stranded DNA breaks, as with base editors, instead of the double-stranded DNA breaks observed in other editing tools, such as CRISPR/Cas9 editing. Collectively, base editing and prime editing offer complementary strengths and weaknesses for making targeted transition mutations. Base editors offer higher editing efficiency and fewer indel byproducts if the desired edit is a transition point mutation and a PAM sequence exists roughly 15 bases from the target site. However, because the prime editing technology does not require a precisely positioned PAM sequence to target a nucleotide sequence, it offers more flexibility and editing precision. Remarkably, prime editors allow all types of substitutions, both transitions and transversions, to be installed into the target sequence.[1][54] Cytosine base editing and adenine BE can already perform precise base transitions but base transversions cannot be achieved with these base editors. Prime editing performs transversions with high efficiency. PE can insert up to 44bp, delete up to 80, or combinations thereof.[33]

Because the prime system involves three separate DNA binding events (between (i) the guide sequence and the target DNA, (ii) the primer binding site and the target DNA, and (iii) the 3' end of the nicked DNA strand and the pegRNA), it has been suggested to have fewer undesirable off-target effects than CRISPR/Cas9.[1][54]

Limitations

There is considerable interest in applying gene-editing methods to the treatment of diseases with a genetic component. However, there are multiple challenges associated with this approach. An effective treatment would require editing of a large number of target cells, which in turn would require an effective method of delivery and a great level of tissue specificity.[1][55]

As of 2019, prime editing looks promising for relatively small genetic alterations, but more research needs to be conducted to evaluate whether the technology is efficient in making larger alterations, such as targeted insertions and deletions. Larger genetic alterations would require a longer RT template, which could hinder the efficient delivery of pegRNA to target cells. Furthermore, a pegRNA containing a long RT template could become vulnerable to damage caused by cellular enzymes.[1][55] Prime editing in plants suffers from low efficiency ranging from zero to a few percent and needs significant improvement.[56]

Some of these limitations have been mitigated by recent improvements to the prime editors,[2][57] including motifs that protect pegRNAs from degradation.[58] Further research is needed before prime editing could be used to correct pathogenic alleles in humans.[1][55] Research has also shown that inhibition of certain MMR proteins, including MLH1 can improve prime editing efficiency.[15]

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 Anzalone, Andrew V.; Randolph, Peyton B.; Davis, Jessie R.; Sousa, Alexander A.; Koblan, Luke W.; Levy, Jonathan M.; Chen, Peter J.; Wilson, Christopher et al. (21 October 2019). "Search-and-replace genome editing without double-strand breaks or donor DNA". Nature 576 (7785): 149–157. doi:10.1038/s41586-019-1711-4. PMID 31634902. Bibcode: 2019Natur.576..149A. 
  2. ↑ 2.0 2.1 2.2 Liu, Pengpeng; Liang, Shun-Qing; Zheng, Chunwei; Mintzer, Esther; Zhao, Yan G.; Ponnienselvan, Karthikeyan; Mir, Aamir; Sontheimer, Erik J. et al. (2021-04-09). "Improved prime editors enable pathogenic allele correction and cancer modelling in adult mice" (in en). Nature Communications 12 (1): 2121. doi:10.1038/s41467-021-22295-w. ISSN 2041-1723. PMID 33837189. Bibcode: 2021NatCo..12.2121L. 
  3. ↑ 3.0 3.1 3.2 Böck, Desirée; Rothgangl, Tanja; Villiger, Lukas; Schmidheini, Lukas; Mathis, Nicholas; Ioannidi, Eleonora; Kreutzer, Susanne; Kontarakis, Zacharias; Rimann, Nicole; Grisch-Chan, Hiu Man; Thöny, Beat (2021-08-17). "Treatment of a metabolic liver disease by in vivo prime editing in mice". pp. 2021.08.17.456632. bioRxiv 10.1101/2021.08.17.456632.
  4. ↑ 4.0 4.1 Jang, Hyewon; Jo, Dong Hyun; Cho, Chang Sik; Shin, Jeong Hong; Seo, Jung Hwa; Yu, Goosang; Gopalappa, Ramu; Kim, Daesik et al. (2021-08-26). "Application of prime editing to the correction of mutations and phenotypes in adult mice with liver and eye diseases" (in en). Nature Biomedical Engineering 6 (2): 181–194. doi:10.1038/s41551-021-00788-9. ISSN 2157-846X. PMID 34446856. https://www.nature.com/articles/s41551-021-00788-9. 
  5. ↑ Biswas, Sudip; Bridgeland, Aya; Irum, Samra; Thomson, Michael J.; Septiningsih, Endang M. (29 August 2022). "Optimization of Prime Editing in Rice, Peanut, Chickpea, and Cowpea Protoplasts by Restoration of GFP Activity". International Journal of Molecular Sciences 23 (17): 9809. doi:10.3390/ijms23179809. PMID 36077206. 
  6. ↑ A Study of the Safety and Efficacy of Prime Editing (PM359) in Participants With p47phox Autosomal Recessive Chronic Granulomatous Disease (CGD ). 21 May 2025. https://clinicaltrials.gov/study/NCT06559176. 
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  26. ↑ Zhang, Guiquan; Liu, Yao; Huang, Shisheng; Qu, Shiyuan; Cheng, Daolin; Yao, Yuan; Ji, Quanjiang; Wang, Xiaolong et al. (2022-04-06). "Enhancement of prime editing via xrRNA motif-joined pegRNA" (in en). Nature Communications 13 (1): 1856. doi:10.1038/s41467-022-29507-x. ISSN 2041-1723. PMID 35387980. Bibcode: 2022NatCo..13.1856Z. 
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  29. ↑ Fang, Guo-Qing; Deng, Yuan; Lyu, Xin-Yuan; Yin, Chang-Qing; Song, Jia; Zhang, Yan; Zhong, Jing; Shen, En-Zhi et al. (2026-04-07). "Boosting prime editing with engineered non-canonical pegRNAs" (in en). Nature Biomedical Engineering: 1–14. doi:10.1038/s41551-026-01650-6. ISSN 2157-846X. PMID 41946927. https://www.nature.com/articles/s41551-026-01650-6. 
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  31. ↑ 31.0 31.1 Soyk, Sebastian; Benoit, Matthias; Lippman, Zachary B. (2020-11-23). "New Horizons for Dissecting Epistasis in Crop Quantitative Trait Variation". Annual Review of Genetics (Annual Reviews) 54 (1): 287–307. doi:10.1146/annurev-genet-050720-122916. ISSN 0066-4197. PMID 32870731. 
  32. ↑ 32.0 32.1 Lin, Xueqiu; Chemparathy, Augustine; La Russa, Marie; Daley, Timothy; Qi, Lei S. (2020-07-20). "Computational Methods for Analysis of Large-Scale CRISPR Screens". Annual Review of Biomedical Data Science (Annual Reviews) 3 (1): 137–162. doi:10.1146/annurev-biodatasci-020520-113523. ISSN 2574-3414. 
  33. ↑ 33.0 33.1 Zhu, Haocheng; Li, Chao; Gao, Caixia (2020-09-24). "Applications of CRISPR–Cas in agriculture and plant biotechnology". Nature Reviews Molecular Cell Biology (Nature Portfolio) 21 (11): 661–677. doi:10.1038/s41580-020-00288-9. ISSN 1471-0072. PMID 32973356. Bibcode: 2020NRMCB..21..661Z. 
  34. ↑ Liu, Pengpeng; Liang, Shun-Qing; Zheng, Chunwei; Mintzer, Esther; Zhao, Yan G.; Ponnienselvan, Karthikeyan; Mir, Aamir; Sontheimer, Erik J. et al. (2021-04-09). "Improved prime editors enable pathogenic allele correction and cancer modelling in adult mice" (in en). Nature Communications 12 (1): 2121. doi:10.1038/s41467-021-22295-w. ISSN 2041-1723. PMID 33837189. Bibcode: 2021NatCo..12.2121L. 
  35. ↑ Song, Myungjae; Lim, Jung Min; Min, Seonwoo; Oh, Jeong-Seok; Kim, Dong Young; Woo, Jae-Sung; Nishimasu, Hiroshi; Cho, Sung-Rae et al. (2021-09-23). "Generation of a more efficient prime editor 2 by addition of the Rad51 DNA-binding domain" (in en). Nature Communications 12 (1): 5617. doi:10.1038/s41467-021-25928-2. ISSN 2041-1723. PMID 34556671. Bibcode: 2021NatCo..12.5617S. 
  36. ↑ Kweon, Jiyeon; Yoon, Jung-Ki; Jang, An-Hee; Shin, Ha Rim; See, Ji-Eun; Jang, Gayoung; Kim, Jong-Il; Kim, Yongsub (2021-06-02). "Engineered prime editors with PAM flexibility". Molecular Therapy 29 (6): 2001–2007. doi:10.1016/j.ymthe.2021.02.022. ISSN 1525-0016. PMID 33636398. 
  37. ↑ Park, Soo-Ji; Jeong, Tae Yeong; Shin, Seung Kyun; Yoon, Da Eun; Lim, Soo-Yeon; Kim, Sol Pin; Choi, Jungmin; Lee, Hyunji et al. (2021-06-03). "Targeted mutagenesis in mouse cells and embryos using an enhanced prime editor" (in en). Genome Biology 22 (1): 170. doi:10.1186/s13059-021-02389-w. ISSN 1474-760X. PMID 34082781. 
  38. ↑ 38.0 38.1 38.2 Chen, Peter (October 28, 2021). "Enhanced Prime Editing Systems By Manipulating Cellular Determinants of Editing Outcomes". Cell 184 (22): 5635–5652.e29. doi:10.1016/j.cell.2021.09.018. PMID 34653350. 
  39. ↑ Velimirovic, Minja; Zanetti, Larissa C.; Shen, Max W.; Fife, James D.; Lin, Lin; Cha, Minsun; Akinci, Ersin; Barnum, Danielle et al. (2022-06-18). "Peptide fusion improves prime editing efficiency" (in en). Nature Communications 13 (1): 3512. doi:10.1038/s41467-022-31270-y. ISSN 2041-1723. PMID 35717416. Bibcode: 2022NatCo..13.3512V. 
  40. ↑ Zhi, Shengyao; Chen, Yuxi; Wu, Guanglan; Wen, Jinkun; Wu, Jinni; Liu, Qianyi; Li, Yang; Kang, Rui et al. (2022-01-05). "Dual-AAV delivering split prime editor system for in vivo genome editing". Molecular Therapy 30 (1): 283–294. doi:10.1016/j.ymthe.2021.07.011. ISSN 1525-0016. PMID 34298129. 
  41. ↑ Wei, Rongwei; Yu, Zhenxing; Ding, Lihong; Lu, Zhike; Yao, Keyi; Zhang, Heng; Huang, Binglin; He, Miao et al. (2025-01-28). "Improved split prime editors enable efficient in vivo genome editing" (in English). Cell Reports 44 (1). doi:10.1016/j.celrep.2024.115144. ISSN 2211-1247. PMID 39745853. https://www.cell.com/cell-reports/abstract/S2211-1247(24)01495-5. 
  42. ↑ Doman, Jordan L.; Pandey, Smriti; Neugebauer, Monica E.; An, Meirui; Davis, Jessie R.; Randolph, Peyton B.; McElroy, Amber; Gao, Xin D. et al. (2023-08-31). "Phage-assisted evolution and protein engineering yield compact, efficient prime editors" (in English). Cell 186 (18): 3983–4002.e26. doi:10.1016/j.cell.2023.07.039. ISSN 0092-8674. PMID 37657419. 
  43. ↑ Lan, Ting; Chen, Huangyao; Tang, Chengcheng; Wei, Yuhui; Liu, Yang; Zhou, Jizeng; Zhuang, Zhenpeng; Zhang, Quanjun et al. (2023-09-12). "Mini-PE, a prime editor with compact Cas9 and truncated reverse transcriptase" (in English). Molecular Therapy Nucleic Acids 33: 890–897. doi:10.1016/j.omtn.2023.08.018. ISSN 2162-2531. PMID 37680986. 
  44. ↑ Chauhan, Vikash P.; Sharp, Phillip A.; Langer, Robert (October 2025). "Engineered prime editors with minimal genomic errors" (in en). Nature 646 (8087): 1254–1260. doi:10.1038/s41586-025-09537-3. ISSN 1476-4687. PMID 40963020. 
  45. ↑ Weber, Yanik; Böck, Desirée; Ivașcu, Anastasia; Mathis, Nicolas; Rothgangl, Tanja; Ioannidi, Eleonora I.; Blaudt, Alex C.; Tidecks, Lisa et al. (2024-03-07). "Enhancing prime editor activity by directed protein evolution in yeast" (in en). Nature Communications 15 (1): 2092. doi:10.1038/s41467-024-46107-z. ISSN 2041-1723. PMID 38453904. Bibcode: 2024NatCo..15.2092W. 
  46. ↑ Davis, Jessie R.; Banskota, Samagya; Levy, Jonathan M.; Newby, Gregory A.; Wang, Xiao; Anzalone, Andrew V.; Nelson, Andrew T.; Chen, Peter J. et al. (February 2024). "Efficient prime editing in mouse brain, liver and heart with dual AAVs" (in en). Nature Biotechnology 42 (2): 253–264. doi:10.1038/s41587-023-01758-z. ISSN 1546-1696. PMID 37142705. 
  47. ↑ Nissa, Meher un; Feng, Yidong; Ali, Shahid; Bao, Baolong (2026-01-09). "Precision, Reproducibility, and Validation in Zebrafish Genome Editing: A Critical Review of CRISPR, Base, and Prime Editing Technologies". Fishes 11 (1): 41. doi:10.3390/fishes11010041. ISSN 2410-3888. Bibcode: 2026Fishe..11...41N. 
  48. ↑ Van Vu, Tien; Thi Nguyen, Ngan; Kim, Jihae; Hoai Nguyen, Thu; Kim, Jae-Yean (2026-01-12). "Development of an ultra-efficient prime editing system in tomato" (in en). Nature Communications 17 (1): 95. doi:10.1038/s41467-025-67874-3. ISSN 2041-1723. PMID 41526382. Bibcode: 2026NatCo..17...95V. 
  49. ↑ Nishizawa-Yokoi, Ayako; Iida, Keiko; Mori, Akiko; Takemura, Miho; Shuto, Yutaro; Nakagawa, Ryoya; Nureki, Osamu; Toki, Seiichi (March 2026). "Efficient and accurate prime editing system in plants" (in en). New Phytologist 249 (5): 2163–2172. doi:10.1111/nph.70890. ISSN 0028-646X. PMID 41531318. Bibcode: 2026NewPh.249.2163N. https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.70890. 
  50. ↑ Hay, Bruce A.; Oberhofer, Georg; Guo, Ming (2021-01-07). "Engineering the Composition and Fate of Wild Populations with Gene Drive". Annual Review of Entomology (Annual Reviews) 66 (1): 407–434. doi:10.1146/annurev-ento-020117-043154. ISSN 0066-4170. PMID 33035437. 
  51. ↑ Wu, Zhijian; Yang, Hongyan; Colosi, Peter (2010). "Effect of Genome Size on AAV Vector Packaging". Molecular Therapy 18 (1): 80–86. doi:10.1038/mt.2009.255. PMID 19904234. 
  52. ↑ "Addgene: PCMV-PE2". https://www.addgene.org/132775/. 
  53. ↑ Zhi, Shengyao; Chen, Yuxi; Wu, Guanglan; Wen, Jinkun; Wu, Jinni; Liu, Qianyi; Li, Yang; Kang, Rui et al. (July 2021). "Dual-AAV delivering split prime editor system for in vivo genome editing". Molecular Therapy 30 (1): 283–294. doi:10.1016/j.ymthe.2021.07.011. ISSN 1525-0016. PMID 34298129. 
  54. ↑ 54.0 54.1 54.2 Sheridan, Cormac (7 November 2019). "Gene editing enters 'prime' time". Nature Biotechnology. doi:10.1038/d41587-019-00032-5. PMID 33154577. 
  55. ↑ 55.0 55.1 55.2 "Scientist David Liu takes your questions on CRISPR and prime editing" (in en-US). 2019-11-06. https://www.statnews.com/2019/11/06/questions-david-liu-crispr-prime-editing-answers/. 
  56. ↑ Molla, Kutubuddin; Sretenovic, Simon; Bansal, Kailash C.; Qi, Yiping (13 September 2021). "Precise plant genome editing using base editors and prime editors". Nature Plants 7 (9): 1166–1187. doi:10.1038/s41477-021-00991-1. PMID 34518669. Bibcode: 2021NatPl...7.1166M. 
  57. ↑ Chen, Peter J.; Hussmann, Jeffrey A.; Yan, Jun; Knipping, Friederike; Ravisankar, Purnima; Chen, Pin-Fang; Chen, Cidi; Nelson, James W. et al. (October 2021). "Enhanced prime editing systems by manipulating cellular determinants of editing outcomes". Cell 184 (22): 5635–5652.e29. doi:10.1016/j.cell.2021.09.018. ISSN 0092-8674. PMID 34653350. 
  58. ↑ Nelson, James W.; Randolph, Peyton B.; Shen, Simon P.; Everette, Kelcee A.; Chen, Peter J.; Anzalone, Andrew V.; An, Meirui; Newby, Gregory A. et al. (2021-10-04). "Engineered pegRNAs improve prime editing efficiency" (in en). Nature Biotechnology 40 (3): 402–410. doi:10.1038/s41587-021-01039-7. ISSN 1546-1696. PMID 34608327. 



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