• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.304.3-305
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• 2002

The present study investigated the passive avoidance and spatial learning in the ${\mu}$-opioid receptor gene knockout mice and wild type mice. In the step-through passive avoidance task. the ${\mu}$-opioid receptor knockout mice did not differ from the wild type mice. In Morris water maze. however. the ${\mu}$-opioid receptor knockout mice showed significant memory deficit compared to wild type mice. (omitted)

• 한국수정란이식학회지
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• 제31권3호
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• pp.179-183
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• 2016

Even though klotho deficiency in mice exhibits multiple aging-like phenotypes, studies using large animal models such as pigs, which have many similarities to humans, have been limited due to the absence of cell lines or animal models. The objective of this study was to generate homozygous klotho knockout porcine cell lines and cloned embryos. A CRISPR sgRNA specific for the klotho gene was designed and sgRNA (targeting exon 3 of klotho) and Cas9 RNPs were transfected into porcine fibroblasts. The transfected fibroblasts were then used for single cell colony formation and 9 single cell-derived colonies were established. In a T7 endonuclease I mutation assay, 5 colonies (#3, #4, #5, #7 and #9) were confirmed as mutated. These 5 colonies were subsequently analyzed by deep sequencing for determination of homozygous mutated colonies and 4 (#3, #4, #5 and #9) from 5 colonies contained homozygous modifications. Somatic cell nuclear transfer was performed to generate homozygous klotho knockout cloned embryos by using one homozygous mutation colony (#9); the cleavage and blastocyst formation rates were 72.0% and 8.3%, respectively. Two cloned embryos derived from a homozygous klotho knockout cell line (#9) were subjected to deep sequencing and they showed the same mutation pattern as the donor cell line. In conclusion, we produced homozygous klotho knockout porcine embryos cloned from genome-edited porcine fibroblasts.

• Asian-Australasian Journal of Animal Sciences
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• 제29권4호
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• pp.564-570
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• 2016

The Sal-like 1 gene (Sall1) is essential for kidney development, and mutations in this gene result in abnormalities in the kidneys. Mice lacking Sall1 show agenesis or severe dysgenesis of the kidneys. In a recent study, blastocyst complementation was used to develop mice and pigs with exogenic organs. In the present study, transcription activator-like effector nuclease (TALEN)-mediated homologous recombination was used to produce Sall1-knockout porcine fibroblasts for developing knockout pigs. The vector targeting the Sall1 locus included a 5.5-kb 5' arm, 1.8-kb 3' arm, and a neomycin resistance gene as a positive selection marker. The knockout vector and TALEN were introduced into porcine fibroblasts by electroporation. Antibiotic selection was performed over 11 days by using $300{\mu}g/mL$ G418. DNA of cells from G418-resistant colonies was amplified using polymerase chain reaction (PCR) to confirm the presence of fragments corresponding to the 3' and 5' arms of Sall1. Further, mono- and bi-allelic knockout cells were isolated and analyzed using PCR-restriction fragment length polymorphism. The results of our study indicated that TALEN-mediated homologous recombination induced bi-allelic knockout of the endogenous gene.

• Molecules and Cells
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• 제39권7호
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• pp.530-535
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• 2016

Large conductance calcium-activated potassium (BK) channels participate in many important physiological functions in excitable tissues such as neurons, cardiac and smooth muscles, whereas the knowledge of BK channels in bone tissues and osteoblasts remains elusive. To investigate the role of BK channels in osteoblasts, we used transcription activator-like effector nuclease (TALEN) to establish a BK knockout cell line on rat ROS17/2.8 osteoblast, and detected the proliferation and mineralization of the BK-knockout cells. Our study found that the BKknockout cells significantly decreased the ability of proliferation and mineralization as osteoblasts, compared to the wild type cells. The overall expression of osteoblast differentiation marker genes in the BK-knockout cells was significantly lower than that in wild type osteoblast cells. The BK-knockout osteoblast cell line in our study displays a phenotype decrease in osteoblast function which can mimic the pathological state of osteoblast and thus provide a working cell line as a tool for study of osteoblast function and bone related diseases.

• BMB Reports
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• 제52권4호
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• pp.289-294
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• 2019

The present study evaluated the role of AHNAK in Bartonella henselae infection. Mice were intraperitoneally inoculated with $2{\times}10^8$ colony-forming units of B. henselae Houston-1 on day 0 and subsequently on day 10. Blood and tissue samples of the mice were collected 8 days after the final B. henselae injection. B. henselae infection in the liver of Ahnak-knockout and wild-type mice was confirmed by performing polymerase chain reaction, with Bartonella adhesion A as a marker. The proportion of B. henselae-infected cells increased in the liver of the Ahnak-knockout mice. Granulomatous lesions, inflammatory cytokine levels, and liver enzyme levels were also higher in the liver of the Ahnak-knockout mice than in the liver of the wild-type mice, indicating that Ahnak deletion accelerated B. henselae infection. The proportion of CD4+interferon-${\gamma}$ ($IFN-{\gamma}^+$) and $CD4^+$ interleukin $(IL)-4^+$ cells was significantly lower in the B. henselae-infected Ahnak-knockout mice than in the B. henselae-infected wild-type mice. In vitro stimulation with B. henselae significantly increased $IFN-{\gamma}$ and IL-4 secretion in the splenocytes obtained from the B. henselae-infected wild-type mice, but did not increase $IFN-{\gamma}$ and IL-4 secretion in the splenocytes obtained from the B. henselae-infected Ahnak-KO mice. In contrast, $IL-1{\alpha}$, $IL-1{\beta}$, IL-6, IL-10, RANTES, and tumor necrosis $factor-{\alpha}$ secretion was significantly elevated in the splenocytes obtained from both B. henselae-infected wild-type and Ahnak-knockout mice. These results indicate that Ahnak deletion promotes B. henselae infection. Impaired $IFN-{\gamma}$ and IL-4 secretion in the Ahnak-knockout mice suggests the impairment of Th1 and Th2 immunity in these mice.

• 대한유전성대사질환학회지
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• 제12권1호
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• pp.5-13
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• 2012

I 세포 질환(뮤코지방증 2형; MIM 252500)과 pseudo-Hurler polydystrophy (뮤코지방증 3형; MIM 252600)는 세포내 비정상적인 리소좀 관련 운송으로 인해 발병한다. 특징적인 소견으로는 섬유아 세포의 세포질에 다수의 봉입체, 뮤코다당뇨의 부재, 혈청 내 리소좀 효소 활성도의 증가, GlcNAc-phosphotransferase 활성도의 감소를 보인다. 이 연구에서는 GlcNAc-phosphotransferase 알파/베타 아형에 대한 knockout 마우스의 표현형과 생화학적 특징을 조사하였다. 또한, 태반으로부터 추출한 리소좀 농축 분획을 knockout 마우스에 투여하였을 때 체중 증가에 대한 효과를 볼 수 있는지에 대해 알아보고자 하였다. knockout 마우스는 뮤코지방증 2형 환자에서 그렇듯이 정상적인 체중 증가를 보이지 않았고 낮은 골밀도를 보였다. 게다가 knockout 마우스의 피부 섬유 아세포의 배양액에서는 리소좀 효소 활성도가 증가한 반면, 세포 내에서는 리소좀 효소 활성도가 감소되어 있는 것을 확인할 수 있었으며 이러한 특징은 뮤코지방증 2형 환자에서 볼 수 있는 특징과 일치한다. knockout 마우스의 꼬리 정맥내로 태반에서 추출한 리소좀 농축 분획을 투여한 결과, 체중이 증가하는 것을 확인할 수 있었고, 반면 생리식염수를 투여한 knockout 마우스의 경우는 체중이 증가하지 않았다. 결론적으로, knockout 마우스의 표현형과 생화학적 특징이 뮤코지방증 2형 환자와 유사하다는 것을 확인하였으며, 리소좀 농축 분획의 치료적 가능성을 증명하였다. 더 큰 범위의 동물 실험을 진행할 필요가 있으나, 이 연구는 질병에 대한 동물 모델을 개발하고 리조솜 농축 분획의 치료적 가능성을 제시하는 것을 통해 현재까지 치료가 불가능한 뮤코지방증 2형의 새로운 치료 방법의 가능성을 열었다고 볼 수 있다.

• BMB Reports
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• 제45권12호
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• pp.686-692
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• 2012

Phenotypic analysis of gene-specific knockout (KO) mice has revolutionized our understanding of in vivo gene functions. As the use of mouse embryonic stem (ES) cells is inevitable for conventional gene targeting, the generation of knockout mice remains a very time-consuming and expensive process. To accelerate the large-scale production and phenotype analyses of KO mice, international efforts have organized global consortia such as the International Knockout Mouse Consortium (IKMC) and International Mouse Phenotype Consortium (IMPC), and they are persistently expanding the KO mouse catalogue that is publicly available for the researches studying specific genes of interests in vivo. However, new technologies, adopting zinc-finger nucleases (ZFNs) or Transcription Activator-Like Effector (TALE) Nucleases (TALENs) to edit the mouse genome, are now emerging as valuable and effective shortcuts alternative for the conventional gene targeting using ES cells. Here, we introduce the recent achievement of IKMC, and evaluate the significance of ZFN/TALEN technology in mouse genetics.

• Molecules and Cells
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• 제37권4호
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• pp.302-306
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• 2014

Myostatin represses muscle growth by negatively regulating the number and size of muscle fibers. Myostatin loss-of-function can result in the double-muscling phenotype and increased muscle mass. Thus, knockout of myostatin gene could improve the quality of meat from mammals. In the present study, zinc finger nucleases, a useful tool for generating gene knockout animals, were designed to target exon 1 of the myostatin gene. The designed ZFNs were introduced into porcine primary fibroblasts and early implantation embryos via electroporation and microinjection, respectively. Mutations around the ZFNs target site were detected in both primary fibroblasts and blastocysts. The proportion of mutant fibroblast cells and blastocyst was 4.81% and 5.31%, respectively. Thus, ZFNs can be used to knockout myostatin in porcine primary fibroblasts and early implantation embryos.

• Laboraroty Animal Research
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• 제34권4호
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• pp.279-287
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• 2018

Placenta specific 8 (PLAC8, also known as ONZIN) is a multi-functional protein that is highly expressed in the intestine, lung, spleen, and innate immune cells, and is involved in various diseases, including cancers, obesity, and innate immune deficiency. Here, we generated a Plac8 knockout mouse using the CRISPR/Cas9 system. The Cas9 mRNA and two single guide RNAs targeting a region near the translation start codon at Plac8 exon 2 were microinjected into mouse zygotes. This successfully eliminated the conventional translation start site, as confirmed by Sanger sequencing and PCR genotyping analysis. Unlike the previous Plac8 deficient models displaying increased adipose tissue and body weights, our male Plac8 knockout mice showed rather lower body weight than sex-matched littermate controls, though the only difference between these two mouse models is genetic context. Differently from the previously constructed embryonic stem cell-derived Plac8 knockout mouse that contains a neomycin resistance cassette, this knockout mouse model is free from a negative selection marker or other external insertions, which will be useful in future studies aimed at elucidating the multi-functional and physiological roles of PLAC8 in various diseases, without interference from exogenous foreign DNA.

• International Journal of Stem Cells
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• 제16권4호
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• pp.394-405
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• 2023

The differentiation of pluripotent stem cells has been used to study disease mechanisms and development. We previously described a method for differentiating human pluripotent stem cells (hPSCs) into salivary gland epithelial progenitors (SGEPs). Here, cystic fibrosis transmembrane conductance regulator (CFTR) knockout hPSCs were differentiated into SGEPs derived from CFTR knockout hESCs (CF-SGEPs) using the same protocol to investigate whether the hPSC-derived SGEPs can model the characteristics of CF. CF-a disease that affects salivary gland (SG) function-is caused by mutations of the CFTR gene. Firstly, we successfully generated CFTR knockout hPSCs with reduced CFTR protein expression using the CRISPR-Cas9 system. After 16 days of differentiation, the protein expression of CFTR decreased in SGEPs derived from CFTR knockout hESCs (CF-SGEPs). RNA-Seq revealed that multiple genes modulating SG development and function were down-regulated, and positive regulators of inflammation were up-regulated in CF-SGEPs, correlating with the salivary phenotype of CF patients. These results demonstrated that CFTR suppression disrupted the differentiation of hPSC-derived SGEPs, which modeled the SG development of CF patients. In summary, this study not only proved that the hPSC-derived SGEPs could serve as manipulable and readily accessible cell models for the study of SG developmental diseases but also opened up new avenues for the study of the CF mechanism.