Autosomal recessive spastic tetraplegia caused by AP4M1 and AP4B1 gene mutation: expansion of the facial and neuroimaging features.
Adaptor protein complex-4 (AP4) is a component of intracellular transportation of proteins, which is thought to have a unique role in neurons. Recently, mutations affecting all four subunits of AP4 (AP4M1, AP4E1, AP4S1, and AP4B1) have been found to cause similar autosomal recessive phenotype consisting of tetraplegic cerebral palsy and intellectual disability. The aim of this study was analyzing AP4 genes in three new families with this phenotype, and discussing their clinical findings with an emphasis on neuroimaging and facial features. Using homozygosity mapping followed by whole-exome sequencing, we identified two novel homozygous mutations in AP4M1 and a homozygous deletion in AP4B1 in three pairs of siblings. Spastic tetraplegia, microcephaly, severe intellectual disability, limited speech, and stereotypic laughter were common findings in our patients. All patients also had similar facial features consisting of coarse and hypotonic face, bitemporal narrowing, bulbous nose with broad nasal ridge, and short philtrum which were not described in patients with AP4M1 and AP4B1 mutations previously. The patients presented here and previously with AP4M1, AP4B1, and AP4E1 mutations shared brain abnormalities including asymmetrical ventriculomegaly, thin splenium of the corpus callosum, and reduced white matter volume. The patients also had hippocampal globoid formation and thin hippocampus. In conclusion, disorders due to mutations in AP4 complex have similar neurological, facial, and cranial imaging findings. Thus, these four genes encoding AP4 subunits should be screened in patients with autosomal recessive spastic tetraplegic cerebral palsy, severe intellectual disability, and stereotypic laughter, especially with the described facial and cranial MRI features.
Department of Pediatric Genetics, Cerrahpaşa Medical School, Istanbul University, Istanbul, Turkey.
Beyhan
B
Tüysüz
Kaya
K
Bilguvar
Naci
N
Koçer
Cengiz
C
Yalçınkaya
Okay
O
Çağlayan
Ece
E
Gül
Sezgin
S
Sahin
Sinan
S
Çomu
Murat
M
Günel
D000293:Adolescent; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / Q000235:genetics*; D001921:Brain / Q000473:pathology; D002648:Child; D004252:DNA Mutational Analysis; D004268:DNA-Binding Proteins; D019066:Facies; D005260:Female; D005808:Genes, Recessive; D056726:Genetic Association Studies; D006720:Homozygote; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009154:Mutation; D059906:Neuroimaging; D010375:Pedigree; D010641:Phenotype; D011782:Quadriplegia / Q000175:diagnosis* / Q000235:genetics*; D016601:RNA-Binding Proteins; D035781:Siblings
D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D004268:DNA-Binding Proteins; C404766:REPIN1 protein, human; D016601:RNA-Binding Proteins
AP4B1; AP4M1; adaptor protein; intellectual disability; spastic tetraplegia