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Cited by 119Ubiquitin and proteasome pathwaysGenetics and Neurodevelopmental DisordersGenomics and Rare Diseases

The DOI matches its Crossref record; 33 of the 33 references it cites were found in a registry or an index.

Biallelic Variants in UBA5 Link Dysfunctional UFM1 Ubiquitin-like Modifier Pathway to Severe Infantile-Onset Encephalopathy

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Muona, Mikko, Ishimura, Ryosuke, Laari, Anni, Ichimura, Yoshinobu, Linnankivi, Tarja, Keski-Filppula, Riikka, Herva, Riitta, Rantala, Heikki, Paetau, Anders, Pöyhönen, Minna, Obata, Miki, Uemura, Takefumi, Karhu, Thomas, Bizen, Norihisa, Takebayashi, Hirohide, McKee, Shane, Parker, Michael J., Akawi, Nadia, McRae, Jeremy, Hurles, Matthew E., Kuismin, Outi, Kurki, Mitja I., Anttonen, Anna-Kaisa, Tanaka, Keiji, Palotie, Aarno, Waguri, Satoshi, Lehesjoki, Anna-Elina, Komatsu, Masaaki·2016·The American Journal of Human Genetics
DOI 10.1016/j.ajhg.2016.06.020PMC PMC5010641
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Abstract

The ubiquitin fold modifier 1 (UFM1) cascade is a recently identified evolutionarily conserved ubiquitin-like modification system whose function and link to human disease have remained largely uncharacterized. By using exome sequencing in Finnish individuals with severe epileptic syndromes, we identified pathogenic compound heterozygous variants in UBA5, encoding an activating enzyme for UFM1, in two unrelated families. Two additional individuals with biallelic UBA5 variants were identified from the UK-based Deciphering Developmental Disorders study and one from the Northern Finland Intellectual Disability cohort. The affected individuals (n = 9) presented in early infancy with severe irritability, followed by dystonia and stagnation of development. Furthermore, the majority of individuals display postnatal microcephaly and epilepsy and develop spasticity. The affected individuals were compound heterozygous for a missense substitution, c.1111G>A (p.Ala371Thr; allele frequency of 0.28% in Europeans), and a nonsense variant or c.164G>A that encodes an amino acid substitution p.Arg55His, but also affects splicing by facilitating exon 2 skipping, thus also being in effect a loss-of-function allele. Using an in vitro thioester formation assay and cellular analyses, we show that the p.Ala371Thr variant is hypomorphic with attenuated ability to transfer the activated UFM1 to UFC1. Finally, we show that the CNS-specific knockout of Ufm1 in mice causes neonatal death accompanied by microcephaly and apoptosis in specific neurons, further suggesting that the UFM1 system is essential for CNS development and function. Taken together, our data imply that the combination of a hypomorphic p.Ala371Thr variant in trans with a loss-of-function allele in UBA5 underlies a severe infantile-onset encephalopathy.

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Authors
Muona, M., Ishimura, R., Laari, A., Ichimura, Y., Linnankivi, T., Keski-Filppula, R., Herva, R., Rantala, H., Paetau, A., Pöyhönen, M., Obata, M., Uemura, T., Karhu, T., Bizen, N., Takebayashi, H., McKee, S., Parker, M. J., Akawi, N., McRae, J., Hurles, M. E., Kuismin, O., Kurki, M. I., Anttonen, A.-K., Tanaka, K., Palotie, A., Waguri, S., Lehesjoki, A.-E., & Komatsu, M.
Affiliations
  • University of Helsinki (FI)
  • Tokyo Metropolitan Institute of Medical Science (JP)
  • Niigata University (JP)
  • Oulu University Hospital (FI)
  • Fukushima Medical University (JP)
  • Belfast City Hospital (GB)
  • Sheffield Children's NHS Foundation Trust (GB)
  • Wellcome Sanger Institute (GB)
  • Broad Institute (US)
Corresponding author
  • Lehesjoki, Anna-Elina
  • Komatsu, Masaaki
ORCID
Venue
The American Journal of Human Genetics
Publisher
Elsevier BV
Published
2016-09
Volume
99
Issue
3
Pages
683-694
ISSN
0002-9297 (ISSN-L)
DOI
10.1016/j.ajhg.2016.06.020
PMC
PMC5010641
OpenAlex
W2512264989
Cited by
119
References
33
Citations by year
2026: 16 · 2025: 18 · 2024: 13 · 2023: 21 · 2022: 8 · 2021: 9 · 2020: 8 · 2019: 11 · 2018: 10 · 2017: 4 · 2016: 1
FWCI
4.51
Type
journal article
Language
en
Open access
Licence
Locations
  • The American Journal of Human Genetics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Työväentutkimus Vuosikirja (submittedVersion, other-oa)
Funders
Japan Society for the Promotion of Science (16J07037)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
Keywords
UBA5, UFM1, compound heterozygosity, biallelic variants, epilepsy, microcephaly, dystonia, spasticity, exon skipping, hypomorphic variants, loss-of-function alleles, UFC1, thioester formation, central nervous system development, neuronal apoptosis, Finnish patients
MeSH terms
Alleles, Animals, Animals, Newborn, Brain Diseases, Central Nervous System, Epilepsy, Exons, Fibroblasts, Finland, Gene Frequency, Heterozygote, Humans, Infant, Intellectual Disability, Microcephaly, Mutation, Neurons, Proteins, Spasms, Infantile, Cohort Studies, Apoptosis, Mice, Knockout, Ubiquitin, Ubiquitin-Activating Enzymes, Mice, Exome

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