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Updated: Jun 28, 2026

An Integrated Approach for Microprotein Identification and Sequence Analysis
Published on: July 12, 2022
The POU5F1P1 pseudogene encodes a putative protein similar to POU5F1 isoform 1
Ioannis Panagopoulos1, Emely Möller, Anna Collin
1Department of Clinical Genetics, Lund University Hospital, Lund, Sweden. ioannis.panagopoulos@med.lu.se
Abstract:
POU5F1, which encodes a transcriptional factor, has two alternatively spliced transcripts, 1 and 2, as well as six pseudogenes. Transcript 1 is considered to be a key regulator of cellular pluripotency and self-renewal. The POU5F1 pseudogene, POU5F1P1 on 8q24, encodes a protein with 95% homology with the isoform 1 of POU5F1. It is located 15 kbp downstream of the SNP rs6983267, which is strongly associated with an increased risk of prostate and colon cancer, and within the amplified region in a variety of human malignancies. The previous finding of expressed sequence tags suggests that POU5F1P1 can be expressed. We showed that a putative POU5F1P1 protein is localized in the nucleus, acts as a transcriptional activator and regulates the expression in a similar way to the POU5F1 isoform 1. However, POU5F1P1 was a weaker activator than isoform 1 of POU5F1, possibly due to the amino acid substitutions.
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