KLF9
protein-coding gene in the species Homo sapiens
Krueppel-like factor 9 is a protein that in humans is encoded by the KLF9 gene. Previously known as Basic Transcription Element Binding Protein 1 (BTEB Protein 1), Klf9 is part of the Sp1 Cys2His2-type zinc finger family of transcription factors. Several previous studies showed Klf9-related regulation of animal development, including cell differentiation of B cells, keratinocytes, and neurons. Klf9 is also a key transcriptional regulator for uterine endometrial cell proliferation, adhesion, and differentiation, all factors that are essential during the process of pregnancy and are turned off during tumorigenesis.
Function
The protein encoded by this gene is a transcription factor that binds to GC box elements located in the promoter. Binding of the encoded protein to a single GC box inhibits mRNA expression while binding to tandemly repeated GC box elements activates transcription.
Oxidative stress increases expression of Klf9 and overexpression of Klf9 gene sensitizes the cell to oxidative stress and reactive oxygen species (ROS).
Using a short hairpin RNA (shRNA) to silence expression of Klf9 provides resistance for the cell to oxidative stress and ROS-related cell death. Klf9 is upregulated by ROS and promotes ROS-related cell death.
Klf9 exhibits similarities to other known oxidative stress genes like NQO1 and HMOX1.
Begin with the source’s own compact description: “KLF9” is protein-coding gene in the species Homo sapiens. The dossier treats that line as a proposition to test through KLF9, protein-coding and gene, not as a finished interpretation.
Why this record matters
The phrase “protein-coding gene in the species Homo sapiens” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Nov 22, 2025. The linked authority identifier is Q17853705. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “KLF9” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.