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Klotho (KL), originally discovered as an aging suppressor, is a membrane protein that shares sequence similarity with the  β -glucosidase enzymes. Recent reports showed Klotho might play a role in adipocyte maturation and systemic glucose metabolism. However, little is known about the transcription factors involved in regulating the expression of porcine  KL  gene. Deletion fragment analysis identified KL-D2 (−418 bp to −3 bp) as the porcine  KL  core promoter. MARC0022311SNP (A or G) in KL intron 1 was detected in Landrace × DIV pigs using the Porcine SNP60 BeadChip. The pGL-D2-A and pGL-D2-G were constructed with KL-D2 and the intron fragment of different alleles and relative luciferase activity of pGL3-D2-G was significantly higher than that of pGL3-D2-A in the PK cells and ST cells. This was possibly the result of a change in  KL  binding ability with transcription factor organic cation transporter 1 (OCT-1), which was confirmed using electrophoretic mobility shift assays (EMSA) and chromatin immune-precipitation (ChIP). Moreover, OCT-1 regulated endogenous  KL  expression by RNA interference experiments. Our study indicates SNP MARC0022311 affects porcine  KL  expression by regulating its promoter activity via OCT-1.

Transcription factor organic cation transporter 1 (OCT-1) affects the expression of porcine Klotho (KL) gene