{"id":2867,"date":"2026-09-03T11:00:00","date_gmt":"2026-09-03T15:00:00","guid":{"rendered":"https:\/\/www.insilens.com\/?p=2867"},"modified":"2026-09-04T16:45:32","modified_gmt":"2026-09-04T20:45:32","slug":"donor-complementary-prime-editing-enables-large-dna-insertions","status":"publish","type":"post","link":"https:\/\/www.insilens.com\/?p=2867","title":{"rendered":"Donor-Complementary Prime Editing Enables Large DNA Insertions"},"content":{"rendered":"

Institution:<\/strong> Fudan University Institute of Metabolism and Integrative Biology · Method:<\/strong> Donor-Complementary Prime Editing (DoPE) · Capability:<\/strong> Insertions up to 12.5 kb · Study Type:<\/strong> Peer-Reviewed (Nature Biotechnology) · Date:<\/strong> September 3, 2026<\/p>\n

\"Donor-Complementary<\/p>\n

Summary<\/h4>\n

A peer-reviewed Nature Biotechnology study describes donor-complementary prime editing, or DoPE, for one-step targeted DNA insertion without a programmed double-strand break, recombinase or transposase. The system combined PE2*, paired overhang-complementary pegRNAs and double-stranded donors with short 3-prime overhangs to insert sequences up to 12.5 kilobases and support library-scale mutagenesis. Evidence is predominantly in cultured cells; therapeutic delivery, in-vivo efficacy and comprehensive genotoxicity remain unresolved.<\/p>\n

What Happened<\/h4>\n

DoPE uses paired prime-editing reactions to create genomic 3-prime flaps complementary to overhangs on a double-stranded DNA donor. Approximately 30-nucleotide overhangs supported the strongest reporter insertion, with a reported peak precise-insertion efficiency of 13% in an ACTB-EGFP system. Correct insertions were detected at multiple genomic loci and in HEK293T, embryonic stem, induced pluripotent stem, mesenchymal stromal and HeLa cells. The platform inserted cargos from short fragments through 12.5 kb and used a single guide pair with pooled donors for amino-acid and nucleotide-resolution saturation mutagenesis. In a disease-model application, replacement of one or two mutant PRKCSH exons restored protein expression across different alleles in vitro, with reported single-exon correction around 16% to 19%. No animal efficacy or therapeutic manufacturing dataset was presented.<\/p>\n

Deep Analysis<\/h4>\n

DoPE separates cargo length from reverse-transcription-template length: prime editing creates complementary genomic ends, while the cargo arrives as preformed DNA. This can expand payload size and avoid permanent recombinase or transposase recognition scars. It does not eliminate risks from paired nicking, donor quality, imperfect junction repair, random donor integration or cellular responses to large DNA and editor exposure. One guide pair that accepts diverse donor libraries could simplify saturation editing, exon replacement and engineered-cell workflows, and reproducible high-fidelity insertion in primary hematopoietic or immune cells, scalable mRNA\/protein delivery and clonal genomic characterization would support near-term translational value, particularly ex vivo. Peak reporter efficiency may not generalize to therapeutically relevant loci, quiescent stem cells or large cargos, however, and delivering PE2*, two guides and an overhang donor to the same cell creates a substantial stoichiometric and manufacturing burden; low efficiency, random integration, rearrangements or loss of stem-cell function in primary models would falsify broad therapeutic claims.<\/p>\n

Company and Product Background<\/h4>\n

The work was led by Fudan University’s Institute of Metabolism and Integrative Biology with collaborators including Feng Zhang. DoPE is a platform method rather than a clinical product. The authors disclose a patent application, making licensing and freedom-to-operate important parts of any commercialization path. PRKCSH mutations cause autosomal-dominant polycystic liver disease through impaired function of the endoplasmic-reticulum protein hepatocystin. Replacing an affected exon could correct multiple alleles with one design, but delivery to relevant hepatic cells, editing fraction required for benefit and long-term safety are unknown.<\/p>\n

Signal Extraction<\/h4>\n\n\n\n\n\n\n\n
Factor<\/th>\nAssessment<\/th>\n<\/tr>\n
Insertion Capacity<\/td>\nUp to 12.5 kb via paired prime editing + double-stranded donor, no DSB<\/td>\n<\/tr>\n
Peak Efficiency<\/td>\n13% precise insertion in ACTB-EGFP reporter system<\/td>\n<\/tr>\n
Disease Application<\/td>\nPRKCSH exon replacement in vitro; 16-19% single-exon correction<\/td>\n<\/tr>\n
Cell Types Tested<\/td>\nHEK293T, ES, iPS, mesenchymal stromal, HeLa cells (all in vitro)<\/td>\n<\/tr>\n
Signal Type<\/td>\nPeer-reviewed platform method, cell-culture stage only<\/td>\n<\/tr>\n<\/table>\n

Reading the Signal<\/h4>\n

Bull case:<\/strong> A single guide pair accepting diverse donor libraries, without needing a recombinase, transposase or double-strand break, could simplify large-payload insertion, saturation mutagenesis and exon-replacement workflows across multiple cell types tested in this study.<\/p>\n

Bear case:<\/strong> Peak reporter efficiency of 13% may not generalize to therapeutically relevant loci or quiescent primary cells, and delivering multiple editing components to the same cell creates a substantial manufacturing and stoichiometric burden with no in-vivo efficacy or genotoxicity data yet available.<\/p>\n

InSilens Take<\/h4>\n

DoPE is a technically meaningful expansion of prime editing because it addresses both cargo size and library compatibility without adding a recombinase or transposase. Its strongest immediate proposition is as a discovery and ex-vivo engineering platform. Treatment readiness is uncertain until the system demonstrates efficient delivery, preserved cell fitness and rigorous exclusion of unintended integration and structural variation in relevant primary cells and animals.<\/p>\n

Signal Assessment<\/h4>\n

Importance:<\/strong> 4\/5 · Direction:<\/strong> Uncertain · Confidence:<\/strong> High on facts, Moderate-low on interpretation<\/p>\n","protected":false},"excerpt":{"rendered":"

A peer-reviewed Nature Biotechnology study describes donor-complementary prime editing, or DoPE, for one-step targeted DNA insertion without a programmed double-strand break, recombinase or transposase. The system combined PE2*, paired overhang-complementary pegRNAs and double-stranded donors…<\/p>\n","protected":false},"author":1,"featured_media":2881,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[533,532,462],"class_list":["post-2867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology-modalities","tag-dope","tag-fudan-university","tag-prime-editing"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/www.insilens.com\/index.php?rest_route=\/wp\/v2\/posts\/2867","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.insilens.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.insilens.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.insilens.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.insilens.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2867"}],"version-history":[{"count":1,"href":"https:\/\/www.insilens.com\/index.php?rest_route=\/wp\/v2\/posts\/2867\/revisions"}],"predecessor-version":[{"id":2892,"href":"https:\/\/www.insilens.com\/index.php?rest_route=\/wp\/v2\/posts\/2867\/revisions\/2892"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.insilens.com\/index.php?rest_route=\/wp\/v2\/media\/2881"}],"wp:attachment":[{"href":"https:\/\/www.insilens.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2867"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.insilens.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2867"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.insilens.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}