Modification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats

Abstract Background Improved genome-editing via oviductal nucleic acids delivery (i-GONAD) is a new technology that facilitates in situ genome-editing of mammalian zygotes exiting the oviductal lumen. The i-GONAD technology has been developed for use in mice, rats, and hamsters; however, oligonucleo...

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Autores principales:	Takuya Aoshima, Yukari Kobayashi, Hisayoshi Takagi, Kenta Iijima, Masahiro Sato, Shuji Takabayashi
Formato:	article
Lenguaje:	EN
Publicado:	BMC 2021
Materias:	Genome editing i-GONAD; rat In vivo electroporation CRISPR/Cas9 Tyrosinase Biotechnology TP248.13-248.65
Acceso en línea:	https://doaj.org/article/74c5e216897a4123a7217565ce07b8c6
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spelling	oai:doaj.org-article:74c5e216897a4123a7217565ce07b8c62021-11-08T11:03:44ZModification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats10.1186/s12896-021-00723-51472-6750https://doaj.org/article/74c5e216897a4123a7217565ce07b8c62021-11-01T00:00:00Zhttps://doi.org/10.1186/s12896-021-00723-5https://doaj.org/toc/1472-6750Abstract Background Improved genome-editing via oviductal nucleic acids delivery (i-GONAD) is a new technology that facilitates in situ genome-editing of mammalian zygotes exiting the oviductal lumen. The i-GONAD technology has been developed for use in mice, rats, and hamsters; however, oligonucleotide (ODN)-based knock-in (KI) is more inefficient in rats than mice. To improve the efficiency of i-GONAD in rats we examined KI efficiency using three guide RNAs (gRNA), crRNA1, crRNA2 and crRNA3. These gRNAs recognize different portions of the target locus, but also overlap each other in the target locus. We also examined the effects of commercially available KI -enhancing drugs (including SCR7, L755,507, RS-1, and HDR enhancer) on i-GONAD-mediated KI efficiency. Results The KI efficiency in rat fetuses generated after i-GONAD with crRNA2 and single-stranded ODN was significantly higher (24%) than crRNA1 (5%; p < 0.05) or crRNA3 (0%; p < 0.01). The KI efficiency of i-GONAD with triple gRNAs was 11%. These findings suggest that KI efficiency largely depends on the type of gRNA used. Furthermore, the KI efficiency drugs, SCR7, L755,507 and HDR enhancer, all of which are known to enhance KI efficiency, increased KI efficiency using the i-GONAD with crRNA1 protocol. In contrast, only L755,507 (15 μM) increased KI efficiency using the i-GONAD with crRNA2 protocol. None of them were significantly different. Conclusions We attempted to improve the KI efficiency of i-GONAD in rats. We demonstrated that the choice of gRNA is important for determining KI efficiency and insertion and deletion rates. Some drugs (e.g. SCR7, L755,507 and HDR enhancer) that are known to increase KI efficiency in culture cells were found to be effective in i-GONAD in rats, but their effects were limited.Takuya AoshimaYukari KobayashiHisayoshi TakagiKenta IijimaMasahiro SatoShuji TakabayashiBMCarticleGenome editingi-GONAD; ratIn vivo electroporationCRISPR/Cas9TyrosinaseBiotechnologyTP248.13-248.65ENBMC Biotechnology, Vol 21, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Genome editing i-GONAD; rat In vivo electroporation CRISPR/Cas9 Tyrosinase Biotechnology TP248.13-248.65
spellingShingle	Genome editing i-GONAD; rat In vivo electroporation CRISPR/Cas9 Tyrosinase Biotechnology TP248.13-248.65 Takuya Aoshima Yukari Kobayashi Hisayoshi Takagi Kenta Iijima Masahiro Sato Shuji Takabayashi Modification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats
description	Abstract Background Improved genome-editing via oviductal nucleic acids delivery (i-GONAD) is a new technology that facilitates in situ genome-editing of mammalian zygotes exiting the oviductal lumen. The i-GONAD technology has been developed for use in mice, rats, and hamsters; however, oligonucleotide (ODN)-based knock-in (KI) is more inefficient in rats than mice. To improve the efficiency of i-GONAD in rats we examined KI efficiency using three guide RNAs (gRNA), crRNA1, crRNA2 and crRNA3. These gRNAs recognize different portions of the target locus, but also overlap each other in the target locus. We also examined the effects of commercially available KI -enhancing drugs (including SCR7, L755,507, RS-1, and HDR enhancer) on i-GONAD-mediated KI efficiency. Results The KI efficiency in rat fetuses generated after i-GONAD with crRNA2 and single-stranded ODN was significantly higher (24%) than crRNA1 (5%; p < 0.05) or crRNA3 (0%; p < 0.01). The KI efficiency of i-GONAD with triple gRNAs was 11%. These findings suggest that KI efficiency largely depends on the type of gRNA used. Furthermore, the KI efficiency drugs, SCR7, L755,507 and HDR enhancer, all of which are known to enhance KI efficiency, increased KI efficiency using the i-GONAD with crRNA1 protocol. In contrast, only L755,507 (15 μM) increased KI efficiency using the i-GONAD with crRNA2 protocol. None of them were significantly different. Conclusions We attempted to improve the KI efficiency of i-GONAD in rats. We demonstrated that the choice of gRNA is important for determining KI efficiency and insertion and deletion rates. Some drugs (e.g. SCR7, L755,507 and HDR enhancer) that are known to increase KI efficiency in culture cells were found to be effective in i-GONAD in rats, but their effects were limited.
format	article
author	Takuya Aoshima Yukari Kobayashi Hisayoshi Takagi Kenta Iijima Masahiro Sato Shuji Takabayashi
author_facet	Takuya Aoshima Yukari Kobayashi Hisayoshi Takagi Kenta Iijima Masahiro Sato Shuji Takabayashi
author_sort	Takuya Aoshima
title	Modification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats
title_short	Modification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats
title_full	Modification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats
title_fullStr	Modification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats
title_full_unstemmed	Modification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats
title_sort	modification of improved-genome editing via oviductal nucleic acids delivery (i-gonad)-mediated knock-in in rats
publisher	BMC
publishDate	2021
url	https://doaj.org/article/74c5e216897a4123a7217565ce07b8c6
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Modification of improved-genome editing via oviductal nucleic acids delivery (i-GONAD)-mediated knock-in in rats

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