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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Overview of Transposition and Recombination02:13

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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Genomic Imprinting and Inheritance02:30

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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Histone Modification02:32

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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Plant DNA Methyltransferase Genes: Multiplicity, Expression, Methylation Patterns.

V V Ashapkin1, L I Kutueva, B F Vanyushin

  • 1Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia. basilashapkin@gmail.com.

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Summary

DNA methyltransferase gene expression and DNA methylation patterns were analyzed in Arabidopsis thaliana organs. A distinct DNA methylation system operates in endosperm, differing from other plant organs.

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Area of Science:

  • Plant molecular biology
  • Epigenetics
  • Genomics

Background:

  • DNA methylation is crucial for gene regulation and genome stability in plants.
  • Arabidopsis thaliana utilizes various DNA methyltransferases (DNMTs) for maintaining and establishing methylation patterns.
  • Understanding tissue-specific expression and methylation is key to deciphering epigenetic regulation.

Purpose of the Study:

  • To investigate the expression profiles of DNMTs and related proteins across different Arabidopsis organs.
  • To analyze the DNA methylation patterns of these genes in various plant tissues.
  • To identify potential tissue-specific epigenetic mechanisms, particularly in the endosperm.

Main Methods:

  • Quantitative gene expression analysis (e.g., RT-qPCR) across multiple Arabidopsis organs.
  • DNA methylation profiling using techniques like bisulfite sequencing.
  • Comparative analysis of gene expression and methylation patterns between organs like embryo and endosperm.

Main Results:

  • Major DNMTs (MET1, CMT3, DRM2) and related proteins (KYP, DRM3) show constitutive expression in most organs.
  • MET1 and CMT3 expression is lower in endosperm, while MET2a, MET2b, MET3, and CMT2 are higher, suggesting a specialized endosperm system.
  • Most genes follow a 'body-methylated' pattern, but MET family genes exhibit CG, CHG, and CHH methylation; MET3 and N6AMT show unusual 3'-end gene body methylation.

Conclusions:

  • Arabidopsis endosperm possesses a distinct DNA methylation regulatory system.
  • Gene body methylation patterns are diverse and can be tissue-specific.
  • Epigenetic regulation via DNA methylation is dynamically controlled across different plant developmental contexts.