Oca2 targeting using CRISPR/Cas9 in the Malawi cichlid Astatotilapia calliptera.

Oca2 targeting using CRISPR/Cas9 in the Malawi cichlid Astatotilapia calliptera.
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DOI:
10.1098/rsos.220077
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发表时间:
2022-04
影响因子:
3.5
通讯作者:
Santos, M. Emilia
Santos, M. Emilia
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Clark, Bethan;Elkin, Joel;Marconi, Aleksandra;Turner, George F.;Smith, Alan M.;Joyce, Domino;Miska, Eric A.;Juntti, Scott A.;Santos, M. Emilia

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识别性状变异背后的遗传位点可以深入了解多样化的机制,但证明因果关系和表征遗传位点的作用需要测试候选基因功能,通常是在非模式物种中。在这里,我们在 Astatotilapia calliptera 中建立了 CRISPR/Cas9 编辑,Astatotilapia calliptera 是马拉维湖辐射区的一种多面慈鲷。通过靶向其他脊椎动物中黑色素合成所需的基因 oca2,我们展示了有效的编辑和种系传递。基因编辑包括编码区的插入缺失(可能是非同源末端连接的结果),以及由于同源定向修复而导致 3' 非翻译区的大量删除。我们发现 oca2 敲除的 A. calliptera 缺乏黑色素,这可能有助于胚胎发育成像和研究成人颜色图案的形成。由于 A. calliptera 类似于马拉维湖慈鲷辐射的假定的通才祖先,因此在该物种中建立基因组编辑将有助于研究这本教科书辐射中的物种形成、适应和性状多样化。
Identifying genetic loci underlying trait variation provides insights into the mechanisms of diversification, but demonstrating causality and characterizing the role of genetic loci requires testing candidate gene function, often in non-model species. Here we establish CRISPR/Cas9 editing in Astatotilapia calliptera, a generalist cichlid of the remarkably diverse Lake Malawi radiation. By targeting the gene oca2 required for melanin synthesis in other vertebrate species, we show efficient editing and germline transmission. Gene edits include indels in the coding region, probably a result of non-homologous end joining, and a large deletion in the 3′ untranslated region due to homology-directed repair. We find that oca2 knock-out A. calliptera lack melanin, which may be useful for developmental imaging in embryos and studying colour pattern formation in adults. As A. calliptera resembles the presumed generalist ancestor of the Lake Malawi cichlid radiation, establishing genome editing in this species will facilitate investigating speciation, adaptation and trait diversification in this textbook radiation.
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