A mutation in the Tubb4a gene leads to microtubule accumulation with hypomyelination and demyelination.

Abstract:

OBJECTIVE:Our goal was to define the genetic cause of the profound hypomyelination in the taiep rat model and determine its relevance to human white matter disease. METHODS:Based on previous localization of the taiep mutation to rat chromosome 9, we tested whether the mutation resided within the Tubb4a (β-tubulin 4A) gene, because mutations in the TUBB4A gene have been described in patients with central nervous system hypomyelination. To determine whether accumulation of microtubules led to progressive demyelination, we analyzed the spinal cord and optic nerves of 2-year-old rats by light and electron microscopy. Cerebral white matter from a patient with TUBB4A Asn414Lys mutation and magnetic resonance imaging evidence of severe hypomyelination were studied similarly. RESULTS:As the taiep rat ages, there is progressive loss of myelin in the brain and dorsal column of the spinal cord associated with increased oligodendrocyte numbers with accumulation of microtubules. This accumulation involved the entire cell body and distal processes of oligodendrocytes, but there was no accumulation of microtubules in axons. A single point mutation in Tubb4a (p.Ala302Thr) was found in homozygous taiep samples. A similar hypomyelination associated with increased oligodendrocyte numbers and arrays of microtubules in oligodendrocytes was demonstrated in the human patient sample. INTERPRETATION:The taiep rat is the first animal model of TUBB4 mutations in humans and a novel system in which to test the mechanism of microtubule accumulation. The finding of microtubule accumulation in a patient with a TUBB4A mutation and leukodystrophy confirms the usefulness of taiep as a model of the human disease. Ann Neurol 2017;81:690-702.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Duncan ID,Bugiani M,Radcliff AB,Moran JJ,Lopez-Anido C,Duong P,August BK,Wolf NI,van der Knaap MS,Svaren J

doi

10.1002/ana.24930

subject

Has Abstract

pub_date

2017-05-01 00:00:00

pages

690-702

issue

5

eissn

0364-5134

issn

1531-8249

journal_volume

81

pub_type

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