Abstract
Estrogen-related receptors (ESRR) are orphan nuclear hormone receptors with unidentified ligands; they play important roles in tissue regulation and development and maintenance of pluripotent cell identity. The splicer variant, genomic organization, and physiological roles of ESRR have been elucidated in the human and the mouse. However, in livestock, they remain elusive. In this study, we cloned porcine ESRR family members , , and . Two alternative splicing variants, and , and a novel were identified. To determine the domain function, we constructed vectors with sequential deletions of the ESRRB coding sequence. The functional analysis showed that the C domain of ESRR plays a core role in promoting the activation of estrogen response elements that are found in all kinds of ESRR-targeting genes, whereas the E domain is not essential for transcription regulation of ESRR unless a specific and identified ligand is applied.
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