Enhanced efficiency of generating human-induced pluripotent stem cells using Lin28-30Kc19 fusion protein

Boram Son, Hyungro Yoon, Jina Ryu, Haein Lee, Jinmyoung Joo, Hee Ho Park, Tai Hyun Park

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Induced pluripotent stem cells (iPSCs) have intrinsic properties, such as self-renewal ability and pluripotency, which are also shown in embryonic stem cells (ESCs). The challenge of improving the iPSC generation efficiency has been an important issue and there have been many attempts to develop iPSC generation methods. In this research, we added Lin28, known as one of the reprogramming factors, in the form of a soluble recombinant protein from E. coli to improve the efficiency of human iPSC (hiPSC) generation, in respect of alkaline phosphatase (AP)-positive colonies. To deliver Lin28 inside the cells, we generated a soluble Lin28-30Kc19 fusion protein, with 30Kc19 at the C-terminal domain of Lin28. 30Kc19, a silkworm hemolymph-derived protein, was fused due to its cell-penetrating and protein-stabilizing properties. The Lin28-30Kc19 was treated to human dermal fibroblasts (HDFs), in combination with four defined reprogramming factors (Oct4, Sox2, c-Myc, and Klf4). After 14 days of cell culture, we confirmed the generated hiPSCs through AP staining. According to the results, the addition of Lin28-30Kc19 increased the number and size of generated AP-positive hiPSC colonies. Through this research, we anticipate that this recombinant protein would be a valuable material for increasing the efficiency of hiPSC generation and for enhancing the possibility as a substitute of the conventional method.

Original languageEnglish
Article number911614
JournalFrontiers in Bioengineering and Biotechnology
StatePublished - 22 Jul 2022

Bibliographical note

Publisher Copyright:
Copyright © 2022 Son, Yoon, Ryu, Lee, Joo, Park and Park.


  • 30Kc19
  • Lin28
  • fusion protein
  • human induced pluripotent stem cells (hiPSCs)
  • soluble


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