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Large exonic deletions in POLR3B gene cause POLR3-related leukodystrophy
Mariana Gutierrez1, Isabelle Thiffault2,3, Kether Guerrero4
1Departments of Pediatrics, Neurology and Neurosurgery, Montreal Children's Hospital, McGill University Health Center, 1001 Boulevard Décarie, Montréal, QC, H4A 3J1, Canada. mariana.gutierrez@mail.mcgill.ca.
Abstract:
POLR3-related (or 4H) leukodystrophy is an autosomal recessive disorder caused by mutations in POLR3A or POLR3B and is characterized by neurological and non-neurological features. In a small proportion of patients, no mutation in either gene or only one mutation is found. Analysis of the POLR3B cDNA revealed a large deletion of exons 21-22 in one case and of exons 26-27 in another case. These are the first reports of long deletions causing POLR3-related leukodystrophy, suggesting that deletions and duplications in POLR3A or POLR3B should be investigated in patients with a compatible phenotype, especially if one pathogenic variant has been identified.
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