title: Using putative bovine embryonic stem cell-like cells for nuclear transfer cloning to determine their functional potential

authors: Appleby, Sarah Jane

subjects: cloning

abstract: The potential for cloning to improve dissemination of elite genetics has been a goal of livestock scientists for many years. However, efficiency of this technique has remained low compared to other in vitro embryo production methods. One hypothesised method to improve cloning efficiency is to use donor cells that require less reprogramming, as donor cells must be reprogrammed to an embryonic state in order to generate a whole embryo. Somatic cells are the most readily available cell type for donor cells, making them the most often used, but also the most differentiated. Embryonic stem cells (ESCs) are pluripotent cells, capable of generating all cell types. As ESCs are at a much lower differentiated state, they would be hypothesised to improve cloning efficiency. However, ESCs have only been derived from mice and rats. Using a novel culture method, bovine ESC-like cells (ePSCs) can be maintained for several weeks in vitro. The aim of this research was to evaluate the efficiency of using these bovine ePSCs in nuclear transfer (NT) cloning.

ePSC colonies were generated from in vitro produced blastocysts and arrested into mitosis with an overnight incubation with 500 nM nocodazole. A method was devised to isolate single cells, using serial treatment in dispase, pronase, and trituration in Ca-Mg-free dissociation media containing cytochalasin B. Arrested colonies were characterised for the degree of mitotic arrest, showing approximately 40% of the colony was arrested in mitosis, and the proportion of cells in DNA synthesis phase had significantly decreased. Cells expressing pluripotency genes SOX2 and NANOG were enriched in the central dome-shaped colony. Analysis of mitotic cells showed that 63% were also pluripotent. NT cloning was optimised for use with donor cells synchronised into mitosis. Pronase treated donor cells fused to metaphase II arrested cytoplasts in isoosmolar fusion buffer resulted in highest fusion rate. Comparison of artificial activation with ionomycin followed by DMAP, CHX, or anisomycin showed that ionomycin/DMAP activation produced the highest blastocyst development rate. Using these optimised conditions, cloning with ePSC donor cells resulted in a three-fold higher blastocyst development than with somatic cells. As donor cells were in metaphase, they contained double the normal amount of DNA. Therefore, it was important to assess the karyotype of blastocysts for normal ploidy. A bimodal distribution of chromosome spreads of around 60 and 120 chromosomes was observed, with higher chromosome numbers apparently restricted to trophoblast cells.

Further validation of blastocyst ploidy, characterisation of donor cells used for NT, and continued optimisation of protocols, through double cytoplast cloning or timing of gap between fusion and activation, is required before completing in vivo cloning trials. Embryo transfer trials will be the final step in addressing the long-term aim of this project: to demonstrate that elite bovine embryos can be converted into ePSCs and then ePSC derived animals.

text: Using putative bovine embryonic stem cell-like cells for nuclear transfer cloning to determine their functional potential The potential for cloning to improve dissemination of elite genetics has been a goal of livestock scientists for many years. However, efficiency of this technique has remained low compared to other in vitro embryo production methods. One hypothesised method to improve cloning efficiency is to use donor cells that require less reprogramming, as donor cells must be reprogrammed to an embryonic state in order to generate a whole embryo. Somatic cells are the most readily available cell type for donor cells, making them the most often used, but also the most differentiated. Embryonic stem cells (ESCs) are pluripotent cells, capable of generating all cell types. As ESCs are at a much lower differentiated state, they would be hypothesised to improve cloning efficiency. However, ESCs have only been derived from mice and rats. Using a novel culture method, bovine ESC-like cells (ePSCs) can be maintained for several weeks in vitro. The aim of this research was to evaluate the efficiency of using these bovine ePSCs in nuclear transfer (NT) cloning.

ePSC colonies were generated from in vitro produced blastocysts and arrested into mitosis with an overnight incubation with 500 nM nocodazole. A method was devised to isolate single cells, using serial treatment in dispase, pronase, and trituration in Ca-Mg-free dissociation media containing cytochalasin B. Arrested colonies were characterised for the degree of mitotic arrest, showing approximately 40% of the colony was arrested in mitosis, and the proportion of cells in DNA synthesis phase had significantly decreased. Cells expressing pluripotency genes SOX2 and NANOG were enriched in the central dome-shaped colony. Analysis of mitotic cells showed that 63% were also pluripotent. NT cloning was optimised for use with donor cells synchronised into mitosis. Pronase treated donor cells fused to metaphase II arrested cytoplasts in isoosmolar fusion buffer resulted in highest fusion rate. Comparison of artificial activation with ionomycin followed by DMAP, CHX, or anisomycin showed that ionomycin/DMAP activation produced the highest blastocyst development rate. Using these optimised conditions, cloning with ePSC donor cells resulted in a three-fold higher blastocyst development than with somatic cells. As donor cells were in metaphase, they contained double the normal amount of DNA. Therefore, it was important to assess the karyotype of blastocysts for normal ploidy. A bimodal distribution of chromosome spreads of around 60 and 120 chromosomes was observed, with higher chromosome numbers apparently restricted to trophoblast cells.

Further validation of blastocyst ploidy, characterisation of donor cells used for NT, and continued optimisation of protocols, through double cytoplast cloning or timing of gap between fusion and activation, is required before completing in vivo cloning trials. Embryo transfer trials will be the final step in addressing the long-term aim of this project: to demonstrate that elite bovine embryos can be converted into ePSCs and then ePSC derived animals.

year: 2015

title: Students’ attitudes towards learning mathematics: Impact of teaching in a sporting context

authors: Sanchal, Anantika

abstract: This study investigated the impact on Year 10 students’ attitudes towards mathematics when learning mathematics in a sporting context. A closed ended, self-reported questionnaire with Likert type statements was used to collect data. Individual statements were analysed by comparing the percentage of students agreeing or disagreeing pre-teaching and post-teaching. In this study, students’ attitude comprised of their confidence, awareness of mathematics and engagement. This study suggests that when students learn in a sporting context, their confidence, seeing the importance of mathematics and engagement increases. The paper also considers implications for teachers, teacher educators and for scholars who are interested in further research.

text: Students’ attitudes towards learning mathematics: Impact of teaching in a sporting context This study investigated the impact on Year 10 students’ attitudes towards mathematics when learning mathematics in a sporting context. A closed ended, self-reported questionnaire with Likert type statements was used to collect data. Individual statements were analysed by comparing the percentage of students agreeing or disagreeing pre-teaching and post-teaching. In this study, students’ attitude comprised of their confidence, awareness of mathematics and engagement. This study suggests that when students learn in a sporting context, their confidence, seeing the importance of mathematics and engagement increases. The paper also considers implications for teachers, teacher educators and for scholars who are interested in further research.

year: 2017

title: Indigenous-washing and colonial amnesia: how New Zealand’s nation brand depoliticizes climate change

authors: Hellmann, Olli

abstract: New Zealand’s nation brand has drawn ever louder accusations of “greenwashing” the country’s image in recent years. Through a visual discourse analysis of Air New Zealand’s Tiaki & The Guardians safety briefing video, this article shows that brand managers have responded with a strategy of “Indigenous-washing,” appropriating the Māori worldview to deflect attention from intensive farming’s carbon footprint and other environmentally unfriendly activities. More broadly, this article makes an important contribution to the growing critical-cultural literature on nation branding by revealing how New Zealand’s latest marketing initiative contributes to the depoliticization of climate change. The “Tiaki” campaign not only positions New Zealand as an “untouched land,” but also closes the space for democratic debate about climate change by obscuring the role of colonialism in causing the planet’s ecological crisis and by silencing alternative socioecological futures proposed by Indigenous peoples.

text: Indigenous-washing and colonial amnesia: how New Zealand’s nation brand depoliticizes climate change New Zealand’s nation brand has drawn ever louder accusations of “greenwashing” the country’s image in recent years. Through a visual discourse analysis of Air New Zealand’s Tiaki & The Guardians safety briefing video, this article shows that brand managers have responded with a strategy of “Indigenous-washing,” appropriating the Māori worldview to deflect attention from intensive farming’s carbon footprint and other environmentally unfriendly activities. More broadly, this article makes an important contribution to the growing critical-cultural literature on nation branding by revealing how New Zealand’s latest marketing initiative contributes to the depoliticization of climate change. The “Tiaki” campaign not only positions New Zealand as an “untouched land,” but also closes the space for democratic debate about climate change by obscuring the role of colonialism in causing the planet’s ecological crisis and by silencing alternative socioecological futures proposed by Indigenous peoples.

year: 2023-07-27