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Identification of Elements Responsible for Maternally-Silenced Imprinted Gene Expression of Upward Curly Leaf1, an F-box Protein Gene that Regulates Curly Leaf in Arabidopsis

한국식물학회지 2020년 63권 5호 p.337 ~ 346
홍주연, 이재훈, 정철웅, Brooks Janie Sue, 최연희, Lee Jong-Seob,
소속 상세정보
홍주연 ( Hong Joo-Yeon ) - Seoul National University School of Biological Sciences
이재훈 ( Lee Jae-Hoon ) - Seoul National University School of Biological Sciences
정철웅 ( Jeong Cheol-Woong ) - Seoul National University School of Biological Sciences
 ( Brooks Janie Sue ) - Yonsei University Underwood International College Integrated Science and Engineering Division
최연희 ( Choi Yeon-Hee ) - Seoul National University School of Biological Sciences
 ( Lee Jong-Seob ) - Seoul National University School of Biological Sciences

Abstract


Upward Curly Leaf 1 (UCL1) is an Arabidopsis thaliana E3 ligase that targets the Curly Leaf (CLF) SET-domain polycomb-group (PcG) protein for degradation via the ubiquitin-26S proteasome system. UCL1 is a paternally-expressed imprinted gene in the endosperm. To precisely locate the promoter elements required for UCL1 imprinting pattern, various gene constructs were created in which the imprinting control region (ICR), endosperm-specific expression (ENSE) element, and/or the linker sequence were altered. By fusing these constructs with a GUS reporter gene, GUS expression patterns were monitored after reciprocal crosses with wild-type Columbia-0 allowing the determination of parent-of-origin expression. Analysis of publicly-available data on the UCL1 promoter region facilitated the search for allele-specific DNA and H3K27 methylation patterns. Overall, three promoter elements are required for maternal repression of UCL1; the ICR sequence located from ? 2.5 to ? 2.4 kb upstream of the translation start site, a differentially methylated region 2 (DMR2) that overlaps the short ATLINE1-1 transposable element in the linker region, and a minimal 271 bp ENSE element. In addition, DNA methylation patterns in the DMR2 contribute to the repression of the maternal UCL1 allele. Our findings would help to understand how parent-of-origin epigenetic patterns are created and maintained in the endosperm.

키워드

Imprinting; DNA methylation; Polycomb group; Endosperm; Promoter elements

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