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KLF2 : ウィキペディア英語版
KLF2

Krüppel-like Factor 2 (KLF2), also known as lung Krüppel-like Factor (LKLF), is a protein that in humans is encoded by the ''KLF2'' gene on chromosome 19. It is a member of the Krüppel-like factor family of zinc finger transcription factors, and it has been implicated in a variety of biochemical processes in the human body, including lung development, embryonic erythropoiesis, epithelial integrity, T-cell viability, and adipogenesis.
== Discovery ==

Erythroid Krüppel-like Factor (EKLF or KLF1) was the first Krüppel-like Factor discovered. It was found to be vitally important for embryonic erythropoiesis in promoting the switch from fetal hemoglobin (Hemoglobin F) to adult hemoglobin (Hemoglobin A) gene expression by binding to highly conserved CACCC domains. ''EKLF'' ablation in mouse embryos produces a lethal anemic phenotype, causing death by embryonic day 14, and natural mutations lead to β+ thalassemia in humans. However, expression of embryonic hemoglobin and fetal hemoglobin genes is normal in ''EKLF''-deficient mice, and since all genes on the human β-globin locus exhibit the CACCC elements, researchers began searching for other Krüppel-like factors.
KLF2, initially called lung Krüppel-like Factor due to its high expression in the adult mouse lung, was first isolated in 1995 by using the zinc finger domain of EKLF as a hybridization probe. By transactivation assay in mouse fibroblasts, KLF2 was also noticed to bind to the β-globin gene promoter containing the CACCC sequence shown to be the binding site for EKLF, confirming KLF2 as a member of the Krüppel-like Factor family.〔 Since then, many other KLF proteins have been discovered.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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