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拟南芥杂交种萌发种子阶段四种主要组蛋白修饰的全基因组分析。

Genome-wide analyses of four major histone modifications in Arabidopsis hybrids at the germinating seed stage.

作者信息

Zhu Anyu, Greaves Ian K, Dennis Elizabeth S, Peacock W James

机构信息

Commonwealth Scientific and Industrial Research Organization, Agriculture and Food, Canberra, Australian Capital Territory, 2601, Australia.

Faculty of Science, University of Technology, Sydney, New South Wales, 2007, Australia.

出版信息

BMC Genomics. 2017 Feb 7;18(1):137. doi: 10.1186/s12864-017-3542-8.

DOI:10.1186/s12864-017-3542-8
PMID:28173754
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5297046/
Abstract

BACKGROUND

Hybrid vigour (heterosis) has been used for decades in cropping agriculture, especially in the production of maize and rice, because hybrid varieties exceed their parents in plant biomass and seed yield. The molecular basis of hybrid vigour is not fully understood. Previous studies have suggested that epigenetic systems could play a role in heterosis.

RESULTS

In this project, we investigated genome-wide patterns of four histone modifications in Arabidopsis hybrids in germinating seeds. We found that although hybrids have similar histone modification patterns to the parents in most regions of the genome, they have altered patterns at specific loci. A small subset of genes show changes in histone modifications in the hybrids that correlate with changes in gene expression. Our results also show that genome-wide patterns of histone modifications in geminating seeds parallel those at later developmental stages of seedlings.

CONCLUSION

Ler/C24 hybrids showed similar genome-wide patterns of histone modifications as the parents at an early germination stage. However, a small subset of genes, such as FLC, showed correlated changes in histone modification and in gene expression in the hybrids. The altered patterns of histone modifications for those genes in hybrids could be related to some heterotic traits in Arabidopsis, such as flowering time, and could play a role in hybrid vigour establishment.

摘要

背景

杂种优势已在作物种植农业中应用了数十年，尤其是在玉米和水稻生产中，因为杂交品种在植物生物量和种子产量方面超过其亲本。杂种优势的分子基础尚未完全了解。先前的研究表明，表观遗传系统可能在杂种优势中发挥作用。

结果

在本项目中，我们研究了拟南芥杂交种子萌发过程中全基因组范围内四种组蛋白修饰的模式。我们发现，虽然杂种在基因组的大多数区域具有与亲本相似的组蛋白修饰模式，但它们在特定基因座处的模式有所改变。一小部分基因在杂种中的组蛋白修饰变化与基因表达变化相关。我们的结果还表明，萌发种子中组蛋白修饰的全基因组模式与幼苗后期发育阶段的模式相似。

结论

Ler/C24杂种在早期萌发阶段显示出与亲本相似的全基因组组蛋白修饰模式。然而，一小部分基因，如FLC，在杂种中的组蛋白修饰和基因表达显示出相关变化。杂种中这些基因的组蛋白修饰模式改变可能与拟南芥的一些杂种优势性状有关，如开花时间，并可能在杂种优势的建立中发挥作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/2ca8892eea61/12864_2017_3542_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/662fe5ac08af/12864_2017_3542_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/0bef9965bf49/12864_2017_3542_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/57c1ecb19aae/12864_2017_3542_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/4848b561da3f/12864_2017_3542_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/5ceee6c60ae1/12864_2017_3542_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/2ca8892eea61/12864_2017_3542_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/662fe5ac08af/12864_2017_3542_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/0bef9965bf49/12864_2017_3542_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/57c1ecb19aae/12864_2017_3542_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/4848b561da3f/12864_2017_3542_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/5ceee6c60ae1/12864_2017_3542_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9239/5297046/2ca8892eea61/12864_2017_3542_Fig6_HTML.jpg

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