A novel ITPA variant causes epileptic encephalopathy with multiple-organ dysfunction.

Abstract:

:Inborn errors of metabolism can cause epileptic encephalopathies. Biallelic loss-of-function variants in the ITPA gene, encoding inosine triphosphate pyrophosphatase (ITPase), have been reported in epileptic encephalopathies with lack of myelination of the posterior limb of the internal capsule, brainstem tracts, and tracts to the primary visual and motor cortices (MIM:616647). ITPase plays an important role in purine metabolism. In this study, we identified two novel homozygous ITPA variants, c.264-1 G > A and c.489-1 G > A, in two unrelated consanguineous families. The probands had epilepsy, microcephaly with characteristic magnetic resonance imaging findings (T2 hyperintensity signals in the pyramidal tracts of the internal capsule, delayed myelination, and thin corpus callosum), hypotonia, and developmental delay; both died in early infancy. Our report expands the knowledge of clinical consequences of biallelic ITPA variants.

journal_name

J Hum Genet

authors

Sakamoto M,Kouhei D,Haniffa M,Silva S,Troncoso M,Santander P,Schonstedt V,Stecher X,Okamoto N,Hamanaka K,Mizuguchi T,Mitsuhashi S,Miyake N,Matsumoto N

doi

10.1038/s10038-020-0765-3

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

751-757

issue

9

eissn

1434-5161

issn

1435-232X

pii

10.1038/s10038-020-0765-3

journal_volume

65

pub_type

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