Exon deletion in the non-catalytic domain of eIF2Bepsilon due to a splice site mutation leads to infantile forms of CACH/VWM with severe decrease of eIF2B GEF activity.
The CACH/VWM syndrome is an autosomal recessive leukodystrophy characterized by a broad spectrum of clinical presentations and by diffuse cavitary degeneration of the white matter on MRI. Mutations responsible for this disorder are missense or frameshift mutations occurring in the five genes (EIF2B1-5) that encode the translation eukaryotic initiation factor eIF2B. We found that a patient with infantile CACH/VWM carries a mutation in the acceptor splice site of EIF2B5 exon 6. In lymphoblastoid cells of the patient, we detected an abnormal EIF2B5 transcript in which exon 6 was absent, however, the predicted protein product lacking part of the non-catalytic domain encoded by exon 6 was not detected. The eIF2B GEF activity was severely decreased. These data support the importance of the non-catalytic domain of the eIF2Bepsilon subunit in the eIF2B complex formation and activity.
Horzinski
L
L
INSERM UMR384, Faculté de Médecine, 28 place Henri Dunant, F-63003 Clermont-Ferrand, France.
Gonthier
C
C
Rodriguez
D
D
Scherer
C
C
Boespflug-Tanguy
O
O
Fogli
A
A
D000293:Adolescent; D000328:Adult; D001259:Ataxia / Q000235:genetics*; D001483:Base Sequence; D020134:Catalytic Domain; D002648:Child; D002675:Child, Preschool; D004252:DNA Mutational Analysis; D020717:Eukaryotic Initiation Factor-2B / Q000737:chemistry* / Q000235:genetics*; D005091:Exons / Q000235:genetics*; D017809:Fatal Outcome; D005260:Female; D005786:Gene Expression Regulation; D015894:Genome, Human / Q000235:genetics; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging; D008969:Molecular Sequence Data; D022821:RNA Splice Sites / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017384:Sequence Deletion
D020717:Eukaryotic Initiation Factor-2B; D022821:RNA Splice Sites; D012333:RNA, Messenger