Genetic determinants of neuroglobin transcription

Neurogenetics. 2014 Mar;15(1):65-75. doi: 10.1007/s10048-013-0388-3. Epub 2013 Dec 24.

Abstract

Neuroglobin (NGB) is a neuron-specific vertebrate globin shown to protect against hypoxia, ischemia, oxidative stress and the toxic effects of Amyloid-beta. Following on our and others' results highlighting the importance of NGB expression in disease, we searched for genetic determinants of its expression. We found that a microRNA expressed with the NGB transcript shows significant target enrichments in the angiogenesis pathway and the Alzheimer disease/presenilin pathway. Using reporter constructs we identified potential promoter/enhancer elements between the transcription start site and 1,142 bp upstream. Using 184 post-mortem temporal lobe samples we replicated the reported negative effect of age, and after genotyping tagging SNPs we found one (rs981471) showing a significant correlation with the gene's expression and another (rs8014408) showing an interaction with age, the rare C allele being correlated with higher expression and faster decline. The two SNPs are towards the 3' end of NGB within the same LD block, 52 Kb apart and modestly correlated (r (2) = 0.5). Next generation sequencing of the same 184 temporal lobe samples and 79 confirmed AD patients across the entire gene region (including >12 Kb on the 3' and 5' flank) revealed limited coding variation, suggesting purifying selection of NGB, but did not identify regulatory or disease associated rare variants. A dinucleotide repeat in intron 1 with extensive evidence of functionality showed interesting but inconclusive results, as it was not amenable to further molecular analysis.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Alleles
  • Alzheimer Disease / genetics
  • Amino Acid Sequence
  • Animals
  • Brain / pathology
  • Chickens
  • Computational Biology
  • Female
  • Gene Expression Regulation
  • Genes, Reporter
  • Genetic Variation
  • Genome
  • Genotype
  • Globins / biosynthesis*
  • Globins / genetics*
  • High-Throughput Nucleotide Sequencing
  • Humans
  • Linkage Disequilibrium
  • Male
  • Mice
  • MicroRNAs / metabolism
  • Middle Aged
  • Molecular Sequence Data
  • Nerve Tissue Proteins / biosynthesis*
  • Nerve Tissue Proteins / genetics*
  • Neuroglobin
  • Polymorphism, Single Nucleotide
  • Promoter Regions, Genetic
  • Sequence Homology, Amino Acid
  • Temporal Lobe / metabolism
  • Transcription, Genetic*
  • Zebrafish

Substances

  • MicroRNAs
  • Nerve Tissue Proteins
  • Neuroglobin
  • Globins