图13 基因组编辑策略和HI等位基因的生成(Lv et al., 2020)。(a)CENH3α和CENH3β的三个等位基因在不同组织中的表达情况。(b)gRNA1和gRNA2在CENH3α上的靶向位置。(c)G23和G24单倍体诱导植物的基因型。
表4 不同基因型植株T1和T2代异系杂交后父本HIR数据(Lv et al., 2020)。
图14 单倍体和诱导植株表型比较(Lv et al., 2020)。
单倍体获得方法简介
小远叨叨
文章至此就告一段落了,CENH3介导的单倍体诱导技术虽然是近十几年才逐渐发展起来的,但是它在单倍体加倍育种技术上具有非常大的应用潜力,是快速获得单倍体的有效策略之一。希望大家可以通过阅读本文来对目前CENH3介导的单倍体诱导技术的研究进展有一定的了解,文中总结不到位的地方,伯小远在此也欢迎大家进行补充哦!
References:
Britt AB, and Kuppu S. Cenh3: An emerging player in haploid induction technology. Front. Plant Sci. 2016, 7:357.
Kuppu S, Tan EH, Nguyen H, et al. Point Mutations in Centromeric Histone Induce Post-zygotic Incompatibility and Uniparental Inheritance. PLoS Genet. 2015, 11(9):e1005494.
Kelliher T, Starr D, Wang W, et al. Maternal Haploids Are Preferentially Induced by CENH3-tailswap Transgenic Complementation in Maize. Front Plant Sci. 2016, 7:414.
Kuppu S, Ron M, Marimuthu MPA, et al. A variety of changes, including CRISPR/Cas9-mediated deletions, in CENH3 lead to haploid induction on outcrossing. Plant Biotechnol J. 2020, 18(10):2068-80.
Lv J, Yu K, Wei J, et al. Generation of paternal haploids in wheat by genome editing of the centromeric histone CENH3. Nat Biotechnol. 2020, 38(12):1397-1401.
Marimuthu MPA, Maruthachalam R, Bondada R, et al. Epigenetically mismatched parental centromeres trigger genome elimination in hybrids. Sci Adv. 2021, 7(47):eabk1151.
Ravi M, Chan SW. Haploid plants produced by centromere-mediated genome elimination. Nature. 2010,464(7288):615-8.
Sullivan BA, Blower MD, and Karpen GH. Determining centromere identity: cyclical stories and forking paths. Nature Rev. Genet. 2001, 2(8):584-596.
Tachiwana, H., Osakabe, A., Shiga, T., et al. Structures of human nucleosomes containing major histone H3 variants. Acta Crystallogr. Sect. D Biol. Crystallogr. 2011, 67:578-583.
Wang N, Gent JI, Dawe RK. Haploid induction by a maize cenh3 null mutant. Sci Adv. 2021, 7(4):eabe2299.
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