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The 5'-flanking region of the human proline/arginine-rich end leucine-rich repeat protein (PRELP) gene has been characterized for both promoter and repressor activity by using a variety of reporter gene constructs and transient transfection into chondrocytes or fibroblasts. The human PRELP gene lacks a TATA box, and in its absence a Sp1-binding site residing 29 bp upstream of the transcription start site is essential for initiating gene expression. In contrast, an Ets-binding site residing 497 bp upstream of the transcription start site can lead to the repression of gene expression. The analysis of nuclear proteins by gel retardation studies with the repressor element identified a common protein, presumably an Ets family member, present in neonatal chondrocytes and skin fibroblasts that do not express the PRELP gene. The factor was not detected in nuclear protein preparations from adult chondrocytes in which the PRELP gene is expressed.

Characterization of the human proline/arginine-rich end leucine-rich repeat protein (PRELP) gene promoter and identification of a repressor element