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Updated: Aug 7, 2026

Identification of Alternative Splicing and Polyadenylation in RNA-seq Data
Published on: June 24, 2021
Identification of a truncated alternative splicing variant of human PPARgamma1 that exhibits dominant negative
Hyo Jung Kim1, Im Sun Woo, Eun Sil Kang
1Department of Pharmacology, Gyeongsang Institute of Health Science, College of Medicine, National University, Jinju, Republic of Korea.
Abstract:
We have identified a novel variant of human peroxisome proliferator-activated receptor gamma (hPPARgamma), derived from insertion of a novel exon 3'. Insertion leads to the introduction of a premature stop codon, resulting in the formation of a truncated splice variant of PPARgamma1 (PPARgamma1(tr)). Western blot analysis confirmed the presence of PPARgamma1(tr) in tumor-derived cell lines. Although PPARgamma1(tr) interfered with transcriptional activity of wild-type PPARgamma1 (PPARgamma1(wt)), activity could be rescued by cotransfection with a vector expressing p300. Overexpression of PPARgamma1(tr) protein in CHO cells greatly enhanced their proliferation and anchorage-independent colony growth on soft agar. These data demonstrate that PPARgamma1(tr) is an important physiologic isoform of PPARgamma that modulates cellular functions of PPARgamma1(wt).
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