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Molecular cloning, polymorphism, and expression analysis of the LKB1/STK11 gene and its association with non-specific digestive disorder in rabbits

  • Yanhong Li
  • Shenqiang Hu
  • Jie Wang
  • Shiyi Chen
  • Xianbo Jia
  • Songjia Lai
Article
  • 99 Downloads

Abstract

Liver kinase B1 (LKB1, also called STK11) encodes a serine/threonine kinase mutated in Peutz–Jeghers cancer syndrome characterized by gastrointestinal polyposis. Although LKB1 plays an important role in regulating energy homeostasis, cell growth, and metabolism via activation of adenosine monophosphate (AMP)-activated protein kinase (AMPK), nothing is known about its molecular characteristics and possible involvement in non-specific digestive disorder (NSDD) of rabbits. In the present study, we first cloned the coding sequence (CDS) of rabbit LKB1, which consisted of 1317 bp encoding 438 amino acids (AAs) and contained a highly conserved S_TKc kinase domain. Its deduced AA sequence showed 87.93–91.10% similarities with that of other species. In order to determine its involvement in NSDD, a NSDD rabbit model was built by a dietary fiber deficiency. The polymorphic site of LKB1 was then investigated in both healthy and NSDD groups using directing sequencing. Our results suggested that a synonymous variant site (840 c. G > C, CCC→CCG) existed in its S_TKc domain, which was associated with susceptibility to NSDD. Furthermore, qPCR was utilized to examine the mRNA levels of LKB1 and its downstream targets (i.e., PRKAA2, mTOR and NF-kβ) in several intestinal-related tissues from both healthy and NSDD groups. Significant changes in their expression levels between two groups indicated that impaired LKB1 signaling contributed to the intestinal abnormality in NSDD rabbits. Taken together, it could be concluded that LKB1 might be a potential candidate gene affecting the occurrence of rabbit NSDD. This information may serve as a basis for further investigations on rabbit digestive diseases.

Keywords

LKB1 Molecular cloning Polymorphism Non-specific digestive disorder Rabbit 

Notes

Acknowledgements

This study was financially supported by the 12th Five-Year Breeding Research projects in Sichuan (Grant No. 2011NZ0099-4), China Agricultural Research System (Grant No. CARS-44-A-2), and the double-support project of Sichuan Agricultural University.

Compliance with ethical standards

Conflict of interest

The authors have declared that no conflict of interest exists.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Yanhong Li
    • 1
  • Shenqiang Hu
    • 1
  • Jie Wang
    • 1
  • Shiyi Chen
    • 1
  • Xianbo Jia
    • 1
  • Songjia Lai
    • 1
  1. 1.Institute of Animal Genetics and BreedingSichuan Agricultural UniversityWenjiangChina

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