Transcriptional Silencing of 35S rDNA in <i>Tragopogon porrifolius</i> Correlates with Cytosine Methylation in Sequence-Specific Manner

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081707%3A_____%2F24%3A00588227" target="_blank" >RIV/68081707:_____/24:00588227 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/1422-0067/25/14/7540" target="_blank" >https://www.mdpi.com/1422-0067/25/14/7540</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/ijms25147540" target="_blank" >10.3390/ijms25147540</a>

Result language

angličtina

Original language name

Transcriptional Silencing of 35S rDNA in <i>Tragopogon porrifolius</i> Correlates with Cytosine Methylation in Sequence-Specific Manner

Original language description

Despite the widely accepted involvement of DNA methylation in the regulation of rDNA transcription, the relative participation of different cytosine methylation pathways is currently described only for a few model plants. Using PacBio, Bisulfite, and RNA sequencing, PCR, Southern hybridizations, and FISH, the epigenetic consequences of rDNA copy number variation were estimated in two T. porrifolius lineages, por1 and por2, the latter with more than twice the rDNA copy numbers distributed approximately equally between NORs on chromosomes A and D. The lower rDNA content in por1 correlated with significantly reduced (>90%) sizes of both D-NORs. Moreover, two (L and S) prominent rDNA variants, differing in the repetitive organization of intergenic spacers, were detected in por2, while only the S-rDNA variant was detected in por1. Transcriptional activity of S-rDNA in por1 was associated with secondary constriction of both A-NORs. In contrast, silencing of S-rDNA in por2 was accompanied by condensation of A-NORs, secondary constriction on D-NORs, and L-rDNA transcriptional activity, suggesting (i) bidirectional nucleolar dominance and (ii) association of S-rDNAs with A-NORs and L-rDNAs with D-NORs in T. porrifolius. Each S- and L-rDNA array was formed of several sub-variants differentiating both genetically (specific SNPs) and epigenetically (transcriptional efficiency and cytosine methylation). The most significant correlations between rDNA silencing and methylation were detected for symmetric CWG motifs followed by CG motifs. No correlations were detected for external cytosine in CCGs or asymmetric CHHs, where methylation was rather position-dependent, particularly for AT-rich variants. We conclude that variations in rDNA copy numbers in plant diploids can be accompanied by prompt epigenetic responses to maintain an appropriate number of active rDNAs. The methylation dynamics of CWGs are likely to be the most responsible for regulating silent and active rDNA states.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10608 - Biochemistry and molecular biology

Project

<a href="/en/project/GA20-28029S" target="_blank" >GA20-28029S: Relevance of duplicated promoter sequences for the function of plant 35S rDNA intergenic spacers.</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

International Journal of Molecular Sciences

ISSN

1661-6596

e-ISSN

1422-0067

Volume of the periodical

25

Issue of the periodical within the volume

14

Country of publishing house

CH - SWITZERLAND

Number of pages

22

Pages from-to

7540

UT code for WoS article

001278756900001

EID of the result in the Scopus database

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