Cited by 62Nerve injury and regenerationHereditary Neurological DisordersCancer Treatment and Pharmacology

Low levels of NMNAT2 compromise axon development and survival

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Gilley, Jonathan, Mayer, Paul R, Yu, Gang, Coleman, Michael P·2019·Human Molecular Genetics

Abstract

Nicotinamide mononucleotide adenylyltransferase 2 (NMNAT2) is an endogenous axon maintenance factor that preserves axon health by blocking Wallerian-like axon degeneration. Mice lacking NMNAT2 die at birth with severe axon defects in both the peripheral nervous system and central nervous system so the complete absence of NMNAT2 in humans is likely to be similarly harmful but probably rare. However, there is evidence of widespread natural variation in human NMNAT2 mRNA expression so it is important to establish whether reduced levels of NMNAT2 have consequences that impact health. While mice that express reduced levels of NMNAT2, either those heterozygous for a silenced Nmnat2 allele or compound heterozygous for one silenced and one partially silenced Nmnat2 allele, remain overtly normal into old age, we now report that Nmnat2 compound heterozygote mice present with early and age-dependent peripheral nerve axon defects. Compound heterozygote mice already have reduced numbers of myelinated sensory axons at 1.5 months and lose more axons, likely motor axons, between 18 and 24 months and, crucially, these changes correlate with early temperature insensitivity and a later-onset decline in motor performance. Slower neurite outgrowth and increased sensitivity to axonal stress are also evident in primary cultures of Nmnat2 compound heterozygote superior cervical ganglion neurons. These data reveal that reducing NMNAT2 levels below a particular threshold compromises the development of peripheral axons and increases their vulnerability to stresses. We discuss the implications for human neurological phenotypes where axons are longer and have to be maintained over a much longer lifespan.

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  • NMNAT2 is enriched in brain, and adequate levels appear essential for axon development and survival.

    “While NMNAT1 and NMNAT3 are ubiquitously expressed, NMNAT2 is enriched in the brain, and adequate levels of NMNAT2 seem to be essential for axon development and survival (Gilley et al., 2019).”

    From NAD+ in Brain Aging and Neurodegenerative Disorders (2019) · cites this paper as Gilley et al., 2019

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Authors
Gilley, J., Mayer, P. R., Yu, G., & Coleman, M. P.
Affiliations
  • Babraham Institute (GB)
  • The University of Texas Southwestern Medical Center (US)
Corresponding author
Gilley, Jonathan
Venue
Human Molecular Genetics
Published
2018-10-09
Volume
28
Issue
3
Pages
448-458
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2897422184
Cited by
62
References
48
Citations by year
2026: 2 · 2025: 9 · 2024: 6 · 2023: 4 · 2022: 17 · 2021: 11 · 2020: 6 · 2019: 7
FWCI
2.73
Type
journal article
Language
en
Open access
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • Apollo (University of Cambridge) (submittedVersion)
  • Apollo
Funders
  • Biotechnology and Biological Sciences Research Council
  • Medical Research Council (MR/N004582/1)
  • Ruth K. Broad Biomedical Research Foundation
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
  • Health Sciences › Medicine › Oncology › Cancer Treatment and Pharmacology
Keywords
NMNAT2, axon development, axon survival, compound heterozygosity, peripheral nerves, motor axons, temperature insensitivity, motor performance decline, neurite outgrowth, superior cervical ganglion neurons
MeSH terms
Age Factors, Animals, Axons, Female, Male, Nerve Degeneration, Neurons, Nicotinamide-Nucleotide Adenylyltransferase, Mice, Neurogenesis, Primary Cell Culture

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