MYCN/LIN28B/Let-7/HMGA2 pathway implicated by meta-analysis of GWAS in suppression of post-natal proliferation thereby potentially contributing to aging

Mech Ageing Dev. Jul-Aug 2013;134(7-8):346-8. doi: 10.1016/j.mad.2013.04.006. Epub 2013 Apr 29.


Mammalian organ and body growth slows and finally terminates because of a progressive suppression of cell proliferation, however little is known about the genetic regulatory mechanisms responsible. A meta-analysis of genome-wide association studies using growth and development-related traits revealed that two genes, HMGA2 and LIN28B, had multiple associations. Altered HMGA2 expression has been shown to result in both overgrowth and pygmy phenotypes in mice and overgrowth in humans. These genes are members of the MYCN/LIN28B/Let-7/HMGA2 pathway and homologs of LIN28B and let-7 are known to regulate developmental timing in Caenorhabditis elegans. Strikingly, expression levels of let-7 and Hmga2 in murine stem cells continue to increase and decrease, respectively, after growth terminates, suggesting that this pathway may contribute to regulating the pace of both development and age-related degenerative phenotypes.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Aging / genetics
  • Aging / metabolism*
  • Animals
  • Caenorhabditis elegans / genetics
  • Caenorhabditis elegans / metabolism*
  • Caenorhabditis elegans Proteins / biosynthesis*
  • Caenorhabditis elegans Proteins / genetics
  • DNA-Binding Proteins / biosynthesis*
  • DNA-Binding Proteins / genetics
  • Female
  • Gene Expression Regulation / physiology*
  • Genome-Wide Association Study*
  • HMGA2 Protein / biosynthesis*
  • HMGA2 Protein / genetics
  • Humans
  • Male
  • Meta-Analysis as Topic
  • Mice
  • MicroRNAs / biosynthesis*
  • MicroRNAs / genetics
  • N-Myc Proto-Oncogene Protein
  • Nuclear Proteins / biosynthesis*
  • Nuclear Proteins / genetics
  • Oncogene Proteins / biosynthesis*
  • Oncogene Proteins / genetics
  • Proto-Oncogene Proteins / biosynthesis*
  • Proto-Oncogene Proteins / genetics
  • RNA-Binding Proteins


  • Caenorhabditis elegans Proteins
  • DNA-Binding Proteins
  • HMGA2 Protein
  • LIN28B protein, human
  • Lin28b protein, mouse
  • MYCN protein, human
  • MYCN protein, mouse
  • MicroRNAs
  • N-Myc Proto-Oncogene Protein
  • Nuclear Proteins
  • Oncogene Proteins
  • Proto-Oncogene Proteins
  • RNA-Binding Proteins
  • let-7 microRNA, C elegans
  • mirnlet7 microRNA, human
  • mirnlet7 microRNA, mouse