Cited by 73Epilepsy research and treatmentFetal and Pediatric Neurological DisordersTuberous Sclerosis Complex Research

Infantile tauopathies: Hemimegalencephaly; tuberous sclerosis complex; focal cortical dysplasia 2; ganglioglioma

Sarnat, Harvey B., Flores-Sarnat, Laura·2015·Brain and Development

Abstract

Tau is a normal microtubule-associated protein; mutations to phosphorylated or acetylated forms are neurotoxic. In many dementias of adult life tauopathies cause neuronal degeneration. Four developmental disorders of the fetal and infant brain are presented, each of which exhibits up-regulation of tau. Microtubules are cytoskeletal structures that provide the strands of mitotic spindles and specify cellular polarity, growth, lineage, differentiation, migration and axonal transport of molecules. Phosphorylated tau is abnormal in immature as in mature neurons. Several malformations are demonstrated in which upregulated tau may be important in pathogenesis. All produce highly epileptogenic cortical foci. The prototype infantile tauopathy is (1) hemimegalencephaly (HME); normal tau is degraded by a mutant AKT3 or AKT1 gene as the aetiology of focal somatic mosaicism in the periventricular neuroepithelium. HME may be isolated or associated with neurocutaneous syndromes, particularly epidermal naevus syndromes, also due to somatic mutations. Other tauopathies of early life include: (2) tuberous sclerosis complex; (3) focal cortical dysplasia type 2b (FCD2b); and (4) ganglioglioma, a tumor with dysplastic neurons and neoplastic glial cells. Pathological tau in these infantile cases alters cellular growth and architecture, synaptic function and tissue organization, but does not cause neuronal loss. All infantile tauopathies are defined neuropathologically as a tetrad of (1) dysmorphic and megalocytic neurons; (2) activation of the mTOR signaling pathway; (3) post-zygotic somatic mosaicism; and (4) upregulation of phosphorylated tau. HME and FCD2b may be the same disorder with different timing of the somatic mutation in the mitotic cycles of the neuroepithelium. HME and FCD2b may be the same disorder with different timing of the somatic mutation in the mitotic cycles of the neuroepithelium. Tauopathies must be considered in infantile neurological disease and no longer restricted to adult dementias. The mTOR inhibitor everolimus, already demonstrated to be effective in TSC, also may be a potential treatment in other infantile tauopathies.

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Crossref · 10.1016/j.braindev.2014.08.010

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Research works printed but not linked: 5

  1. Flores-Sarnat L. Hemimegalencephaly syndrome. In: Handbook of clinical neurology. Sarnat HB, Curatolo P, editors. Malformations of the nervous system, vol. 87. Edinburgh: Elsevier; 2008. p. 153–76. · DOI
  2. Oblak A, Murrell J, Richardson R, Epperson F, Ghetti B. Comparative analysis of neuronal vulnerability of the anterior cingulate cortex in hereditary and sporadic tauopathies. J Neuropathol Exp Neurol 2014;73:597 (abstract).
  3. Yalon, 2011, Regression of subependymal giant cell astrocytomas with RAD001 (Everolimus) in tuberous sclerosis complex, Childs Nerv Syst, 27, 179, 10.1007/s00381-010-1222-y · DOI
  4. Gondim D, Murrell J, Oblak A, Sokol D, Walsh L, Bosh G, et al. Childhood neurodegenerative disease with widespread tauopathy. J Neuropathol Exp Neurol 2014;73:624–5 (abstract).
  5. Iqbal, 2009, Mechanisms of tau-induced neurodegeneration, Acta Neuropathol, 118, 53, 10.1007/s00401-009-0486-3 · DOI · Paper page

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Authors
Sarnat, H. B., & Flores-Sarnat, L.
Affiliations
University of Calgary (CA)
Corresponding author
Sarnat, Harvey B.
Venue
Brain and Development
Publisher
Elsevier BV
Published
2015-06
Volume
37
Issue
6
Pages
553-562
ISSN
0387-7604 (ISSN-L)
OpenAlex
W1989822657
Cited by
73
References
105
Citations by year
2025: 3 · 2024: 1 · 2023: 7 · 2022: 7 · 2021: 7 · 2020: 7 · 2019: 8 · 2018: 8 · 2017: 10 · 2016: 7 · 2015: 6 · 2014: 1 · 2012: 1
FWCI
5.38
Type
journal article
Language
en
Open access
closed
Locations
  • Brain and Development (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Fetal and Pediatric Neurological Disorders
  • Health Sciences › Medicine › Physiology › Tuberous Sclerosis Complex Research
Keywords
hemimegalencephaly, tuberous sclerosis complex, ganglioglioma, tau phosphorylation, somatic mosaicism, mTOR signaling, everolimus, neurocutaneous syndrome, developmental brain malformations
MeSH terms
Brain, Epilepsy, Humans, Infant, Male, Microtubules, Neurons, Phosphorylation, Tuberous Sclerosis, tau Proteins, Ganglioglioma, Tauopathies, TOR Serine-Threonine Kinases, Malformations of Cortical Development, Group I, Hemimegalencephaly

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