POLR3A and POLR3B Mutations in Unclassified Hypomyelination.

Abstract:

OBJECTIVE:This study aims to ascertain frequency of mutations in POLR3A or POLR3B, which are associated with 4H leukodystrophy, in a cohort of patients with unclassified hypomyelination. METHODS AND RESULTS:In a cohort of 22 patients with the magnetic resonance imaging (MRI) diagnosis of unclassified hypomyelination and without typical clinical signs, we evaluated clinical and MRI features. Developmental delay or intellectual disability, ataxia, and spasticity were frequent symptoms. POLR3A and POLR3B were sequenced. A compound heterozygote mutation in POLR3B was found in only one patient. Additional investigations allowed a definitive diagnosis in 10 patients. CONCLUSION:Mutations in POLR3A or POLR3B are rare in patients with unclassified hypomyelination, and alternative diagnoses should be considered first.

journal_name

Neuropediatrics

journal_title

Neuropediatrics

authors

Cayami FK,La Piana R,van Spaendonk RM,Nickel M,Bley A,Guerrero K,Tran LT,van der Knaap MS,Bernard G,Wolf NI

doi

10.1055/s-0035-1550148

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

221-8

issue

3

eissn

0174-304X

issn

1439-1899

journal_volume

46

pub_type

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