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Prokaryotes and eukaryotes use diverse strategies to cope with invading mobile genetic elements, including programmed DNA elimination (PDE). In the ciliate Paramecium, elimination of transposable elements and their relics requires the PiggyMac (Pgm) endonuclease and its five PgmL partners, yet how t...
ORGANISM(S): Paramecium tetraurelia 
2026-04-01 | PXD068119 | Pride
The ciliated protozoan Tetrahymena undergoes extensive programmed DNA elimination when the germline micronucleus produces the new macronucleus during sexual reproduction. DNA elimination is epigenetically controlled by DNA sequences of the parental macronuclear genome, and this epigenetic regulation...
ORGANISM(S): Tetrahymena thermophila 
Organisms invest significant effort into maintaining genome stability. However, in diverse groups of eukaryotes, portions or entire chromosomes are lost in early development or during sex determination, a process known as programmed DNA elimination. Little is known about how different segments of t...
ORGANISM(S): Ascaris suum 
Linking Germline Telomere Removal to Global Programmed DNA Elimination in Tetrahymena
To limit transposable element (TE) mobilization, most eukaryotes have evolved small RNAs to silence TE activity via homology-dependent mechanisms. Small RNAs, 20-30 nucleotides in length, bind to PIWI proteins and guide them to nascent transcripts by sequence complementarity, triggering the recruitm...
ORGANISM(S): Paramecium tetraurelia 
2025-09-22 | PXD063336 | Pride
First description of Programmed-DNA Elimination in M. belari and M. spiculigera
A developmental condensin I complex assists the Paramecium PiggyMac domesticated transposase during programmed DNA elimination
Chromatin diminution is the programmed elimination of specific DNA sequences during development. It occurs in diverse species, but the function(s) of diminution and the specificity of sequence loss remain largely unknown. Diminution in the nematode Ascaris suum occurs during early embryonic cleavage...
ORGANISM(S): Ascaris suum 
Spatial genome organization is associated with nematode programmed DNA elimination
We report the existence of both methylcytosine and hydroxymethylcytosine in the genomic DNA of the ciliate Oxytricha trifallax during its genome rearrangement process. These modifications are dynamically added, de novo, to sequences targeted for elimination and are not present after the rearrangemen...
ORGANISM(S): Oxytricha trifallax 
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