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Relevance to Autism

Two de novo variants (one nonsense, one missense) in the EPHB2 gene were identified in separate next-generation sequencing reports using ASD probands (Sanders et al., 2012; Kong et al., 2012).

Molecular Function

This gene encodes a member of the Eph receptor family of receptor tyrosine kinase transmembrane glycoproteins. These receptors are composed of an N-terminal glycosylated ligand-binding domain, a transmembrane region and an intracellular kinase domain. They bind ligands called ephrins and are involved in diverse cellular processes including motility, division, and differentiation. A distinguishing characteristic of Eph-ephrin signaling is that both receptors and ligands are competent to transduce a signaling cascade, resulting in bidirectional signaling. This protein belongs to a subgroup of the Eph receptors called EphB. Proteins of this subgroup are distinguished from other members of the family by sequence homology and preferential binding affinity for membrane-bound ephrin-B ligands.

External Links

        

References

Type
Title
Type of Disorder
Associated Disorders
Author, Year
Primary
De novo mutations revealed by whole-exome sequencing are strongly associated with autism.
ASD
Support
Inherited and multiple de novo mutations in autism/developmental delay risk genes suggest a multifactorial model.
ASD
Support
De novo genic mutations among a Chinese autism spectrum disorder cohort.
ASD
Support
Rate of de novo mutations and the importance of father's age to disease risk.
ASD, SCZ
Support
Integrating de novo and inherited variants in 42
ASD
Support
Mutational Landscape of Autism Spectrum Disorder Brain Tissue
ASD
Support
Exploring the biological role of postzygotic and germinal de novo mutations in ASD
ASD
Support
Large-scale targeted sequencing identifies risk genes for neurodevelopmental disorders
ASD, DD
Recent Recommendation
ASD
Variant ID
Variant Type
Allele Change
Residue Change
Inheritance Pattern
Inheritance Association
Family Type
Author, Year
 GEN410R001 
 stop_gained 
 c.2572C>T 
 p.Gln858Ter 
 De novo 
  
 Simplex 
 GEN410R002 
 missense_variant 
 G>A 
 p.Gly900Ser 
 De novo 
  
  
 GEN410R003 
 missense_variant 
 c.2531G>A 
 p.Arg844Gln 
 Familial 
 Maternal 
  
 GEN410R004 
 missense_variant 
 c.668G>A 
 p.Arg223Gln 
 Familial 
 Paternal 
  
 GEN410R005 
 missense_variant 
 c.2731G>A 
 p.Asp911Asn 
 Familial 
 Paternal 
  
 GEN410R006 
 missense_variant 
 c.2437G>A 
 p.Gly813Ser 
 Unknown 
 Not maternal 
  
 GEN410R007 
 stop_gained 
 c.3013C>T 
 p.Arg1005Ter 
 Unknown 
 Not maternal 
  
 GEN410R008 
 missense_variant 
 c.2405G>A 
 p.Arg802Gln 
 Familial 
 Paternal 
 Simplex 
 GEN410R009 
 missense_variant 
 c.1058G>A 
 p.Arg353Gln 
 Familial 
 Maternal 
 Simplex 
 GEN410R010 
 frameshift_variant 
 c.3096dup 
 p.Arg1033AlafsTer9 
 Unknown 
  
  
 GEN410R011 
 missense_variant 
 c.2185C>T 
 p.Arg729Trp 
 Familial 
 Maternal 
  
 GEN410R012 
 missense_variant 
 c.2308C>T 
 p.Arg770Cys 
 Familial 
 Maternal 
  
 GEN410R013 
 missense_variant 
 c.254G>A 
 p.Arg85His 
 Familial 
 Maternal 
  
 GEN410R014 
 missense_variant 
 c.2012C>G 
 p.Ala671Gly 
 Familial 
 Maternal 
  
 GEN410R015 
 missense_variant 
 c.2408A>G 
 p.Asp803Gly 
 Unknown 
  
  
 GEN410R016 
 missense_variant 
 c.2582A>G 
 p.Asp861Gly 
 Unknown 
  
  
 GEN410R017 
 missense_variant 
 c.2599A>T 
 p.Ile867Phe 
 Unknown 
  
  
 GEN410R018 
 missense_variant 
 c.2773A>T 
 p.Ile925Phe 
 Unknown 
  
  
 GEN410R019 
 missense_variant 
 c.916C>T 
 p.Arg306Cys 
 Unknown 
  
  
 GEN410R020 
 missense_variant 
 c.2530C>G 
 p.Arg844Gly 
 Unknown 
  
 Simplex 
 GEN410R021 
 missense_variant 
 c.2609G>A 
 p.Arg870Gln 
 Unknown 
  
  
 GEN410R022 
 missense_variant 
 c.1552C>T 
 p.Arg518Cys 
 Unknown 
  
  
 GEN410R023 
 missense_variant 
 c.1715G>A 
 p.Arg572His 
 Unknown 
  
  
 GEN410R024 
 missense_variant 
 c.241C>T 
 p.Arg81Cys 
 Unknown 
  
  
 GEN410R025 
 missense_variant 
 c.1994G>A 
 p.Arg665Gln 
 Unknown 
  
  
 GEN410R026 
 missense_variant 
 c.2065G>A 
 p.Val689Met 
 Unknown 
  
  
 GEN410R027 
 missense_variant 
 c.2356G>A 
 p.Gly786Arg 
 Unknown 
  
  
 GEN410R028 
 missense_variant 
 c.2653C>T 
 p.Arg885Cys 
 Unknown 
  
 Simplex 
 GEN410R029 
 missense_variant 
 c.2864G>A 
 p.Arg955Gln 
 Unknown 
  
  
 GEN410R030 
 missense_variant 
 c.2134C>T 
 p.Arg712Trp 
 Unknown 
  
  
 GEN410R031 
 missense_variant 
 c.2600G>A 
 p.Arg867His 
 Unknown 
  
  
 GEN410R032 
 missense_variant 
 c.2750C>T 
 p.Thr917Met 
 Unknown 
  
  
 GEN410R033 
 missense_variant 
 c.2531G>A 
 p.Arg844Gln 
 Unknown 
  
  
 GEN410R034 
 frameshift_variant 
 c.438del 
 p.Phe147SerfsTer11 
 Unknown 
  
  
 GEN410R035 
 frameshift_variant 
 c.384del 
 p.Asn129ThrfsTer8 
 Unknown 
  
  
 GEN410R036 
 missense_variant 
 c.1850A>G 
 p.Asp617Gly 
 Unknown 
  
  
 GEN410R037 
 missense_variant 
 c.1828C>T 
 p.Arg610Trp 
 Unknown 
  
  
 GEN410R038 
 missense_variant 
 c.2117C>T 
 p.Ser706Phe 
 Unknown 
  
  
 GEN410R039 
 missense_variant 
 c.2017G>A 
 p.Ala673Thr 
 Unknown 
  
  
 GEN410R040 
 missense_variant 
 c.2191G>A 
 p.Ala731Thr 
 Unknown 
  
  
 GEN410R041 
 missense_variant 
 c.1882G>A 
 p.Gly628Arg 
 Unknown 
  
  
 GEN410R042 
 missense_variant 
 c.2654G>A 
 p.Arg885His 
 Unknown 
  
  
 GEN410R043 
 missense_variant 
 c.2723C>T 
 p.Thr908Met 
 Unknown 
  
  
 GEN410R044 
 missense_variant 
 c.880C>T 
 p.Arg294Trp 
 Unknown 
  
  
 GEN410R045 
 missense_variant 
 c.880C>T 
 p.Arg294Trp 
 Unknown 
  
  
 GEN410R046 
 missense_variant 
 c.880C>T 
 p.Arg294Trp 
 Unknown 
  
  
 GEN410R047 
 missense_variant 
 c.1591+3369C>T 
  
 Unknown 
  
  
 GEN410R048 
 missense_variant 
 c.1591+3369C>T 
  
 Unknown 
  
  
 GEN410R049 
 missense_variant 
 c.1702C>T 
 p.Arg568Trp 
 Unknown 
  
  
 GEN410R050 
 missense_variant 
 c.2170G>T 
 p.Val724Leu 
 Unknown 
  
  
 GEN410R051 
 missense_variant 
 c.1924G>A 
 p.Glu642Lys 
 Unknown 
  
  
 GEN410R052 
 missense_variant 
 c.2098G>A 
 p.Glu700Lys 
 Unknown 
  
  
 GEN410R053 
 missense_variant 
 c.2402G>A 
 p.Arg801Gln 
 Unknown 
  
  
 GEN410R054 
 missense_variant 
 c.2240C>T 
 p.Ser747Leu 
 Unknown 
  
  
 GEN410R055 
 missense_variant 
 c.2414C>T 
 p.Ser805Leu 
 Unknown 
  
  
 GEN410R056 
 missense_variant 
 c.979G>C 
 p.Ala327Pro 
 De novo 
  
 Simplex 
 GEN410R057 
 synonymous_variant 
 c.2976G>A 
 p.Arg992%3D 
 Unknown 
  
  
 GEN410R058 
 synonymous_variant 
 c.174G>A 
 p.Thr58%3D 
 De novo 
  
 Multiplex 
 GEN410R059 
 missense_variant 
 c.595C>T 
 p.Arg199Cys 
 De novo 
  
  
 GEN410R060 
 synonymous_variant 
 c.690G>A 
 p.Ala230%3D 
 De novo 
  
  
 GEN410R061 
 synonymous_variant 
 c.2043C>T 
 p.Asn681%3D 
 De novo 
  
  
Chromosome
CNV Locus
CNV Type
# of studies
Animal Model
1
Deletion-Duplication
 10
 

Model Summary

An EphB2 humanized mutation identified from an ASD proband shows ASD-like social behaviors, such as decreased social approach and interaction. An EphB2 knockout mutant also shows social behavior deficits. Social stimulus-dependent neuronal activation is ablated in the mutant mice. Mutant mice also show deficits in synaptic transmission in the dorsomedial prefrontal cortex neurons. Social stimulus-dependent neuronal activation can be restored through synchronous optogenetic activation of the prefrontal cortex, of both the subject (mutant) and partner mice.

References

Type
Title
Author, Year
Model Type: Genetic
Model Genotype: Homozygous
Mutation: The Ephb2 knockout mutation (MGI:2149765) was generated through homologous recombination in embryonic stem cells by deleting a 1.4-kb segment of the Ephb2 locus and inserting a neomycin resistance cassette. This deletion, which encompasses the exon for amino acids 29-50, generates a protein null allele, by introducing a frameshift downstream from the deletion.
Allele Type: Knockout
Strain of Origin: (129X1/SvJ x 129S1/Sv)F1-Kitl+
Genetic Background: 129
ES Cell Line: R1
Mutant ES Cell Line:
Model Source: Tony Pawson lab (PMID 8689685)
Category
Entity
Quantity
Experimental Paradigm
Age at Testing
Social interaction1
Decreased
 Three-chamber social approach test
 3, 8 weeks
Social approach1
Decreased
 Three-chamber social approach test
 3, 8 weeks
Targeted expression1
Decreased
 Immunoprecipitation
 2-3 months
Targeted expression1
Decreased
 Quantitative PCR (qRT-PCR)
 3, 8 weeks
 Not Reported:


Interactor Symbol Interactor Name Interactor Organism Entrez ID Uniprot ID Interaction Type Evidence Reference
Dock9 dedicator of cytokinesis 9 259237 Q63603 IP/WB
Hussain NK , et al. 2015
EFNB2 ephrin-B2 1948 P52799 IP; LC-MS/MS
Huttlin EL , et al. 2015
Gria1 glutamate receptor, ionotropic, AMPA 1 50592 P19490 IP/WB
Hussain NK , et al. 2015
Gria2 glutamate receptor, ionotropic, AMPA2 (alpha 2) 14800 P23819 Proximity ligation assay
Miyamoto T , et al. 2015
RELN reelin 5649 P78509 IP/WB
Sentrk A , et al. 2011
SPSB2 splA/ryanodine receptor domain and SOCS box containing 2 84727 Q99619 IP; LC-MS/MS
Huttlin EL , et al. 2015

SPSB2
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