Kotzaeridou, U.* ; Young-Baird, S.K.* ; Suckow, V.* ; Thornburg, A.G.* ; Wagner, M. ; Harting, I.* ; Christ, S.* ; Strom, T.M. ; Dever, T.E.* ; Kalscheuer, V.M.*
Novel pathogenic EIF2S3 missense variants causing clinically variable MEHMO syndrome with impaired eIF2γ translational function, and literature review.
Clin. Genet. 98, 507-514 (2020)
Rare pathogenicEIF2S3missense and terminal deletion variants cause the X-linked intellectual disability (ID) syndrome MEHMO, or a milder phenotype including pancreatic dysfunction and hypopituitarism. We present two unrelated male patients who carry novelEIF2S3pathogenic missense variants (p.(Thr144Ile) and p.(Ile159Leu)) thereby broadening the limited genetic spectrum and underscoring clinically variable expressivity of MEHMO. While the affected male with p.(Thr144Ile) presented with severe motor delay, severe microcephaly, moderate ID, epileptic seizures responsive to treatments, hypogenitalism, central obesity, facial features, and diabetes, the affected male with p.(Ile159Leu) presented with moderate ID, mild motor delay, microcephaly, epileptic seizures resistant to treatment, central obesity, and mild facial features. Both variants are located in the highly conserved guanine nucleotide binding domain of theEIF2S3encoded eIF2 gamma subunit of the heterotrimeric translation initiation factor 2 (eIF2) complex. Further, we investigated both variants in a structural model and in yeast. The reduced growth rates and lowered fidelity of translation with increased initiation at non-AUG codons observed for both mutants in these studies strongly support pathogenicity of the variants.
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Publication type
Article: Journal article
Document type
Scientific Article
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Keywords
Eif2gamma ; Intellectual Disability ; Mehmo ; X-linked; Intellectual Disability; Mutation; Retardation; Mechanism; Switch
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Language
english
Publication Year
2020
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2020
ISSN (print) / ISBN
0009-9163
e-ISSN
1399-0004
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Volume: 98,
Issue: 5,
Pages: 507-514
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Wiley
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111 River St, Hoboken 07030-5774, Nj Usa
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Peer reviewed
POF-Topic(s)
30205 - Bioengineering and Digital Health
30501 - Systemic Analysis of Genetic and Environmental Factors that Impact Health
Research field(s)
Genetics and Epidemiology
PSP Element(s)
G-503200-001
G-500700-001
Grants
National Institute of General Medical Sciences
Copyright
Erfassungsdatum
2020-10-19