Biallelic truncating variants in ATP9A cause a novel neurodevelopmental disorder involving postnatal microcephaly and failure to thrive.
J Med Genet
; 59(7): 662-668, 2022 07.
Article
em En
| MEDLINE
| ID: mdl-34379057
ABSTRACT
BACKGROUND:
Genes implicated in the Golgi and endosomal trafficking machinery are crucial for brain development, and mutations in them are particularly associated with postnatal microcephaly (POM).METHODS:
Exome sequencing was performed in three affected individuals from two unrelated consanguineous families presenting with delayed neurodevelopment, intellectual disability of variable degree, POM and failure to thrive. Patient-derived fibroblasts were tested for functional effects of the variants.RESULTS:
We detected homozygous truncating variants in ATP9A. While the variant in family A is predicted to result in an early premature termination codon, the variant in family B affects a canonical splice site. Both variants lead to a substantial reduction of ATP9A mRNA expression. It has been shown previously that ATP9A localises to early and recycling endosomes, whereas its depletion leads to altered gene expression of components from this compartment. Consistent with previous findings, we also observed overexpression of ARPC3 and SNX3, genes strongly interacting with ATP9A.CONCLUSION:
In aggregate, our findings show that pathogenic variants in ATP9A cause a novel autosomal recessive neurodevelopmental disorder with POM. While the physiological function of endogenous ATP9A is still largely elusive, our results underline a crucial role of this gene in endosomal transport in brain tissue.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Membrana Transportadoras
/
Adenosina Trifosfatases
/
Transtornos do Neurodesenvolvimento
/
Deficiência Intelectual
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Microcefalia
/
Malformações do Sistema Nervoso
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
J Med Genet
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Alemanha