A further case of AFG2B-related neurodevelopmental disorder with hearing loss and microcephaly allows further clarification of pathogenicity of the variant c.1313T>C, p.(Leu438Pro).
AFG2B
neurodevelopmental disorder
trio exome sequencing
Journal
Molecular genetics & genomic medicine
ISSN: 2324-9269
Titre abrégé: Mol Genet Genomic Med
Pays: United States
ID NLM: 101603758
Informations de publication
Date de publication:
30 Oct 2023
30 Oct 2023
Historique:
revised:
06
09
2023
received:
26
05
2023
accepted:
13
10
2023
medline:
30
10
2023
pubmed:
30
10
2023
entrez:
30
10
2023
Statut:
aheadofprint
Résumé
Bi-allelic variants in AFG2B (previously known as SPATA5L1) have recently been associated with a neurodevelopmental disorder with hearing loss and spasticity, as well as isolated hearing loss. We report on a 6 1/2-year-old girl with a history of global developmental delay, subsequent intellectual disability without relevant language acquisition, sensorineural hearing loss, muscular hypotonia and microcephaly. We performed trio exome sequencing on the patient and her parents. Trio exome sequencing revealed likely pathogenic compound heterozygous missense variants in AFG2B [c.527G>T, p.(Gly176Val) and c.1313T>C, p.(Leu438Pro)] in the patient. Of note, the change c.1313T>C, p.(Leu438Pro) has been observed in a previously published patient as part of a complex disease allele along with a second homozygous missense change, so the exact contribution of the two alterations to this patient's disease had initially remained unclear. Our results support the pathogenic relevance of the c.1313T>C, p.(Leu438Pro) allele while providing detailed insights into the disease manifestation of a further patient.
Sections du résumé
BACKGROUND
BACKGROUND
Bi-allelic variants in AFG2B (previously known as SPATA5L1) have recently been associated with a neurodevelopmental disorder with hearing loss and spasticity, as well as isolated hearing loss. We report on a 6 1/2-year-old girl with a history of global developmental delay, subsequent intellectual disability without relevant language acquisition, sensorineural hearing loss, muscular hypotonia and microcephaly.
METHODS
METHODS
We performed trio exome sequencing on the patient and her parents.
RESULTS
RESULTS
Trio exome sequencing revealed likely pathogenic compound heterozygous missense variants in AFG2B [c.527G>T, p.(Gly176Val) and c.1313T>C, p.(Leu438Pro)] in the patient.
CONCLUSION
CONCLUSIONS
Of note, the change c.1313T>C, p.(Leu438Pro) has been observed in a previously published patient as part of a complex disease allele along with a second homozygous missense change, so the exact contribution of the two alterations to this patient's disease had initially remained unclear. Our results support the pathogenic relevance of the c.1313T>C, p.(Leu438Pro) allele while providing detailed insights into the disease manifestation of a further patient.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2310Subventions
Organisme : Open Access Publication Fund of the University of Tübingen
Informations de copyright
© 2023 The Authors. Molecular Genetics & Genomic Medicine published by Wiley Periodicals LLC.
Références
Liu, Y., Black, J., Kisiel, N., & Kulesz-Martin, M. F. (2000). Spaf, a new AAA-protein specific to early spermatogenesis and malignant conversion. Oncogene, 19(12), 1579-1588. https://doi.org/10.1038/sj.onc.1203442
Ni, C., Schmitz, D. A., Lee, J., Pawłowski, K., Wu, J., & Buszczak, M. (2022). Labeling of heterochronic ribosomes reveals C1ORF109 and SPATA5 control a late step in human ribosome assembly. Cell Reports, 38(13), 110597. https://doi.org/10.1016/j.celrep.2022.110597
Richard, E. M., Bakhtiari, S., Marsh, A. P. L., Kaiyrzhanov, R., Wagner, M., Shetty, S., Pagnozzi, A., Nordlie, S. M., Guida, B. S., Cornejo, P., Magee, H., Liu, J., Norton, B. Y., Webster, R. I., Worgan, L., Hakonarson, H., Li, J., Guo, Y., Jain, M., … Kruer, M. C. (2021). Bi-allelic variants in SPATA5L1 lead to intellectual disability, spastic-dystonic cerebral palsy, epilepsy, and hearing loss. American Journal of Human Genetics, 108(10), 2006-2016. https://doi.org/10.1016/j.ajhg.2021.08.003
Richards, S., Aziz, N., Bale, S., Bick, D., Das, S., Gastier-Foster, J., Grody, W. W., Hegde, M., Lyon, E., Spector, E., Voelkerding, K., & Rehm, H. L. (2015). Standards and guidelines for the interpretation of sequence variants: A joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology. Genetics in Medicine, 17(5), 405-424. https://doi.org/10.1038/gim.2015.30