Spatiotemporal regulation of gene expression by polycomb repressive complex 2(PRc2)is critical for animal and plant development.The Arabidopsis fertilization independent seed(FIS)-PRC2 complex functions specifically d...Spatiotemporal regulation of gene expression by polycomb repressive complex 2(PRc2)is critical for animal and plant development.The Arabidopsis fertilization independent seed(FIS)-PRC2 complex functions specifically during plant reproduction from gametogenesis to seed development.After a double fertilization event,triploid endosperm proliferates early,followed by the growth of a diploid embryo,which replaces the endosperm in Arabidopsis and many dicots.Key genes critical for endosperm proliferation such as IKkU2 and MINI3 are activated after fertilization.Here we report that two MADS-box AGAMOUS-LIKE(AGL)proteins associate with the key endosperm proliferation loci and recruit the FIS-PRC2 repressive complex at 4-5 days after pollination(DAP).Interestingly,AGL9 and AGL15 only accumulate toward the end of endosperm proliferation at 4-5 DAP and promote the deposition of H3K27me3 marks at key endosperm proliferation loci.Disruption of AGL9 and AGL15 or overexpression of AGL9 or AGL15 significantly influence endosperm proliferation and cellularization.Genome-wide analysis with cleavage Under Targets and tagmentation(CUT&Tag)sequencing and RNA sequencing revealed the landscape of endosperm H3K27me3 marks and gene expression profiles in Col-0 and agl9 agl15.CUT&Tag qPCR also demonstrated the occupancy of the two MADS-box proteins and FIS-PRC2 on a few representative target loci.Our studies suggest that MADS-box proteins could potentially recruit PRc2 to regulate many other developmental processes in plants or even in fungi and animals.展开更多
目的筛选灰毡毛忍冬Lonicera macranthoides基因表达分析的内参基因,研究其Mads-box基因家族AGL15基因(Lm AGL15)的时空表达特性。方法克隆灰毡毛忍冬内参基因18 S r RNA、Ubiquilin、Actin和Efl-β的基因片段,评价了4个基因在不同部位...目的筛选灰毡毛忍冬Lonicera macranthoides基因表达分析的内参基因,研究其Mads-box基因家族AGL15基因(Lm AGL15)的时空表达特性。方法克隆灰毡毛忍冬内参基因18 S r RNA、Ubiquilin、Actin和Efl-β的基因片段,评价了4个基因在不同部位叶、茎和花蕾,以及4个基因在灰毡毛忍冬生长不同时期的稳定性,筛选内参基因,分析Lm AGL15基因的时空表达特性。结果 18 S r RNA表达最稳定,适宜作为内参基因,叶片、茎的Lm AGL15基因相对表达量较低,花蕾相对表达量较高。花蕾不同发育时期,Lm AGL15的相对表达量呈现逐渐降低的变化,20 d后Lm AGL15的相对表达量最低,然后依次是花蕾初期(15 d)、青绿色花蕾期(10 d)、绿白色花蕾期(5 d)。结论 18 S r RNA是适宜的内参基因。叶片、茎和花蕾中,Lm AGL15的相对表达量差异明显。花蕾发育不同时期,Lm AGL15的相对表达量呈逐渐降低的变化,与花蕾开放变化规律相似。展开更多
MYB transcription factors compose one of the largest transcription factor families in Arabidopsis, which play important roles in vari- ous developmental processes as well as defense responses against environmental str...MYB transcription factors compose one of the largest transcription factor families in Arabidopsis, which play important roles in vari- ous developmental processes as well as defense responses against environmental stresses. In this study, we report the characterization of AtMYB17 gene, a putative R2R3 type MYB gene family member in Arabidopsis. AtMYB17 was found exclusively localized in nuclear, with an activation domain at its C-terminus. AtMYBI7 was highly expressed in inflorescences and siliques, especially at early flower developmental stages. The level of AtMYB17 transcripts was also found to increase after imbibition during seed germination and gradually concentrate to the shoot apex. Bioinformatics analysis identified several binding sites of LEAFY （LFY） and AGL15 in the promoter re- gion of AtMYB17. Promoter-GUS fusion analysis showed that the LFY binding sites were important in fine-tuning regulation of the spatio-temporal expression ofAtMYB17 in transgenic plants. Moreover, AtMYB17 was up-regulated in 35S：：AGL15 plants. Taken together, our data suggest that LFY may be involved in the regulation of AtMYB17, possibly together with AGL 15, and thereafter in early inflores- cence development and seed germination.展开更多
基金a grant from National Science Foundation IOS-1933291(M.N.).
文摘Spatiotemporal regulation of gene expression by polycomb repressive complex 2(PRc2)is critical for animal and plant development.The Arabidopsis fertilization independent seed(FIS)-PRC2 complex functions specifically during plant reproduction from gametogenesis to seed development.After a double fertilization event,triploid endosperm proliferates early,followed by the growth of a diploid embryo,which replaces the endosperm in Arabidopsis and many dicots.Key genes critical for endosperm proliferation such as IKkU2 and MINI3 are activated after fertilization.Here we report that two MADS-box AGAMOUS-LIKE(AGL)proteins associate with the key endosperm proliferation loci and recruit the FIS-PRC2 repressive complex at 4-5 days after pollination(DAP).Interestingly,AGL9 and AGL15 only accumulate toward the end of endosperm proliferation at 4-5 DAP and promote the deposition of H3K27me3 marks at key endosperm proliferation loci.Disruption of AGL9 and AGL15 or overexpression of AGL9 or AGL15 significantly influence endosperm proliferation and cellularization.Genome-wide analysis with cleavage Under Targets and tagmentation(CUT&Tag)sequencing and RNA sequencing revealed the landscape of endosperm H3K27me3 marks and gene expression profiles in Col-0 and agl9 agl15.CUT&Tag qPCR also demonstrated the occupancy of the two MADS-box proteins and FIS-PRC2 on a few representative target loci.Our studies suggest that MADS-box proteins could potentially recruit PRc2 to regulate many other developmental processes in plants or even in fungi and animals.
文摘目的筛选灰毡毛忍冬Lonicera macranthoides基因表达分析的内参基因,研究其Mads-box基因家族AGL15基因(Lm AGL15)的时空表达特性。方法克隆灰毡毛忍冬内参基因18 S r RNA、Ubiquilin、Actin和Efl-β的基因片段,评价了4个基因在不同部位叶、茎和花蕾,以及4个基因在灰毡毛忍冬生长不同时期的稳定性,筛选内参基因,分析Lm AGL15基因的时空表达特性。结果 18 S r RNA表达最稳定,适宜作为内参基因,叶片、茎的Lm AGL15基因相对表达量较低,花蕾相对表达量较高。花蕾不同发育时期,Lm AGL15的相对表达量呈现逐渐降低的变化,20 d后Lm AGL15的相对表达量最低,然后依次是花蕾初期(15 d)、青绿色花蕾期(10 d)、绿白色花蕾期(5 d)。结论 18 S r RNA是适宜的内参基因。叶片、茎和花蕾中,Lm AGL15的相对表达量差异明显。花蕾发育不同时期,Lm AGL15的相对表达量呈逐渐降低的变化,与花蕾开放变化规律相似。
基金supported by the State Key Basic Research and Development Plan (No. 2006CB100105)the 111 Project of Peking University in China.
文摘MYB transcription factors compose one of the largest transcription factor families in Arabidopsis, which play important roles in vari- ous developmental processes as well as defense responses against environmental stresses. In this study, we report the characterization of AtMYB17 gene, a putative R2R3 type MYB gene family member in Arabidopsis. AtMYB17 was found exclusively localized in nuclear, with an activation domain at its C-terminus. AtMYBI7 was highly expressed in inflorescences and siliques, especially at early flower developmental stages. The level of AtMYB17 transcripts was also found to increase after imbibition during seed germination and gradually concentrate to the shoot apex. Bioinformatics analysis identified several binding sites of LEAFY （LFY） and AGL15 in the promoter re- gion of AtMYB17. Promoter-GUS fusion analysis showed that the LFY binding sites were important in fine-tuning regulation of the spatio-temporal expression ofAtMYB17 in transgenic plants. Moreover, AtMYB17 was up-regulated in 35S：：AGL15 plants. Taken together, our data suggest that LFY may be involved in the regulation of AtMYB17, possibly together with AGL 15, and thereafter in early inflores- cence development and seed germination.
