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In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing
Published on: May 5, 2023
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Repression of chimeric transcripts emanating from endogenous retrotransposons by a sequence-specific transcription
Genome Biology
|June 21, 2014
Summary
Krüppel-like Factor 3 (KLF3) silences specific retroviral elements in erythroid cells. This prevents aberrant transcripts, like a dominant-negative PU.1 isoform, maintaining transcriptome integrity.
Area of Science:
- Genomics
- Molecular Biology
- Epigenetics
Background:
- Retroviral elements are transcribed and regulated during development.
- Histone and DNA modifying enzymes are linked to retroviral silencing.
- Selective recognition of diverse retroviral families remains unclear.
Purpose of the Study:
- Investigate the specific factors involved in retroviral element silencing.
- Determine the role of Krüppel-like Factor 3 (KLF3) in erythroid cells.
Main Methods:
- Analysis of retroviral transcription in murine erythroid cells.
- Investigating the function of KLF3 in regulating retroviral elements.
- Identifying aberrant transcripts and their functional consequences.
Main Results:
- KLF3 specifically silences ORR1A0 long terminal repeat transcription in erythroid cells.
- Absence of KLF3 leads to widespread ORR1A0 transcription driven by KLF1.
- Aberrant transcripts can splice to genic exons, producing a dominant-negative PU.1 isoform.
Conclusions:
- KLF3 is crucial for maintaining murine erythroid transcriptome integrity.
- KLF3 selectively represses specific retroelements.
- KLF3 likely cooperates with other factors for global retroviral silencing.
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