Any process involved in the conversion of a primary mRNA transcript into one or more mature mRNA(s) prior to translation into polypeptide.

The process in which the identity of a floral organ primordium is specified. Identity is considered to be the aggregate of characteristics by which a structure is recognized.

The cellular chemical reactions and pathways involving RNA, ribonucleic acid, one of the two main type of nucleic acid, consisting of a long, unbranched macromolecule formed from ribonucleotides joined in 3',5'-phosphodiester linkage.

Any process that decreases the frequency, rate or extent of the inactivation of gene expression by a posttranscriptional mechanism.

Any process involved in the conversion of a primary ribosomal RNA (rRNA) transcript into one or more mature rRNA molecules.

The chemical reactions and pathways resulting in the breakdown of tRNA, transfer RNA, a class of relatively small RNA molecules responsible for mediating the insertion of amino acids into the sequence of nascent polypeptide chains during protein synthesis.

Any process that modulates the frequency, rate or extent of the addition of telomeric repeats by telomerase.

The chemical reactions and pathways resulting in the selective degradation of meiosis-specific transcripts during vegetative growth, by a mechanism that requires determinant of selective removal (DSR) sequences in the targeted mRNAs and involves a YTH family protein.

Any process involved in the conversion of a primary small nucleolar RNA (snoRNA) transcript into a mature snoRNA.

The enzymatic addition of a sequence of adenylyl residues (polyadenylation) at the 3' end of a non-coding RNA, occurring as part of the process of polyadenylation-dependent non-coding RNA catabolism.

The process involved in retention of mRNAs that have incorrectly formed 3'-ends within the nucleus at the site of transcription.

Any process that modulates the frequency, rate or extent of heterochromatin island assembly.

Any process that modulates the frequency, rate or extent of heterochromatin domain assembly.

A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.

That part of the nuclear content other than the chromosomes or the nucleolus.

The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.

A discrete extra-nucleolar subnuclear domain, 20-50 in number, in which splicing factors are seen to be localized by immunofluorescence microscopy.

A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.

A small, dense body one or more of which are present in the nucleus of eukaryotic cells. It is rich in RNA and protein, is not bounded by a limiting membrane, and is not seen during mitosis. Its prime function is the transcription of the nucleolar DNA into 45S ribosomal-precursor RNA, the processing of this RNA into 5.8S, 18S, and 28S components of ribosomal RNA, and the association of these components with 5S RNA and proteins synthesized outside the nucleolus. This association results in the formation of ribonucleoprotein precursors; these pass into the cytoplasm and mature into the 40S and 60S subunits of the ribosome.

Extra-nucleolar nuclear domains usually visualized by confocal microscopy and fluorescent antibodies to specific proteins.

A region of heterochromatin that is formed dynamically in response to environmental signals by a process that does not require RNAi, and is enriched in histone H3 methylated on lysine 9 (H3K9me).

A protein complex that consists of a heterodimer formed by Red1 and Mtl1 or homologs thereof, and that promotes degradation of mRNAs and noncoding RNAs and associates with different proteins to assemble heterochromatin via distinct mechanisms.

The nuclear RNA silencing (NURS) complex is a protein complex formed by Red1, Mtl1, Red5, Rmn1, Iss10/Pir1, and Ars2/Pir2 that regulates RNA degradation and histone H3 lysine 9 methylation. It is likely related to the human CBCN complex.