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Relevance to Autism

Several studies have found genetic association between the SLC6A4 gene and autism in AGRE, CPEA, French-Caucasian, Portuguese and several mixed US population cohorts. However, several other studies found no genetic association between the SLC6A4 gene and autism in AGRE, SARC, US and Chinese Han population cohorts. Separately, genetic association has been found between the SLC6A4 gene and pervasive developmental disorder (PDD) in a Dutch population cohort. In addition, rare mutations in the SLC6A4 gene have been identified in individuals with ASD (Neale et al., 2012).

Molecular Function

The encoded protein has serotonin transporter activity, serotonin:sodium symport er activity.

External Links

        

References

Type
Title
Type of Disorder
Associated Disorders
Author, Year
Primary
Evidence of linkage between the serotonin transporter and autistic disorder.
ASD
Positive Association
Serotonin transporter intron 2 polymorphism associated with rigid-compulsive behaviors in Dutch individuals with pervasive developmental disorder.
PDD
Positive Association
Variants of the serotonin transporter gene (SLC6A4) significantly contribute to hyperserotonemia in autism.
ASD
Positive Association
Serotonin transporter promoter variants in autism: functional effects and relationship to platelet hyperserotonemia.
ASD
Positive Association
Association study in siblings and case-controls of serotonin- and oxytocin-related genes with high functioning autism.
ASD
Positive Association
Transmission disequilibrium mapping at the serotonin transporter gene (SLC6A4) region in autistic disorder.
ASD
Positive Association
Common and rare alleles of the serotonin transporter gene, SLC6A4, associated with Tourette's disorder.
TS
Positive Association
Autism and the serotonin transporter: the long and short of it.
ASD
Positive Association
Allelic heterogeneity at the serotonin transporter locus (SLC6A4) confers susceptibility to autism and rigid-compulsive behaviors.
ASD
Negative Association
Lack of evidence for association between the serotonin transporter gene (SLC6A4) polymorphisms and autism in the Chinese trios.
ASD
Negative Association
Linkage and association analysis at the serotonin transporter (SLC6A4) locus in a rigid-compulsive subset of autism.
ASD
Negative Association
Association Between 5-HTTLPR Polymorphism and the Risk of Autism: A Meta-Analysis Based on Case-Control Studies.
ASD
Negative Association
Association of the FGA and SLC6A4 genes with autistic spectrum disorder in a Korean population.
ASD
Negative Association
Lack of evidence for association of the serotonin transporter gene SLC6A4 with autism.
ASD
Support
Performance comparison of bench-top next generation sequencers using microdroplet PCR-based enrichment for targeted sequencing in patients with aut...
ASD
ID, epilepsy
Support
Major depressive disorder
Anxiety
Support
Patterns and rates of exonic de novo mutations in autism spectrum disorders.
ASD
Support
Sex-biased effects on hippocampal circuit development by perinatal SERT expression in CA3 pyramidal neurons
Support
Autism gene variant causes hyperserotonemia, serotonin receptor hypersensitivity, social impairment and repetitive behavior.
Support
The serotonin reuptake transporter modulates mitochondrial copy number and mitochondrial respiratory complex gene expression in the frontal cortex and cerebellum in a sexually dimorphic manner
Support
Autism associated with low 5-hydroxyindolacetic acid in CSF and the heterozygous SLC6A4 gene Gly56Ala plus 5-HTTLPR L/L promoter variants.
ASD
Support
The influence of 5-HTTLPR transporter genotype on amygdala-subgenual anterior cingulate cortex connectivity in autism spectrum disorder.
Support
Maternal serotonin transporter genotype affects risk for ASD with exposure to prenatal stress.
Support
ASD
DD, ID
Support
Synaptic, transcriptional and chromatin genes disrupted in autism.
ASD
Support
ASD
Highly Cited
Serotonin transporter genetic variation and the response of the human amygdala.
Recent Recommendation
Haploinsufficiency for Pten and Serotonin transporter cooperatively influences brain size and social behavior.
Recent Recommendation
Social approach in genetically engineered mouse lines relevant to autism.
Recent Recommendation
The molecular genetic architecture of human personality: beyond self-report questionnaires.
Recent Recommendation
De Novo Synonymous Mutations in Regulatory Elements Contribute to the Genetic Etiology of Autism and Schizophrenia.

Rare

Variant ID
Variant Type
Allele Change
Residue Change
Inheritance Pattern
Inheritance Association
Family Type
Author, Year
 GEN235R001 
 5_prime_UTR_variant 
 c.-149C>A 
  
  
  
  
 GEN235R002 
 missense_variant 
 c.167G>C 
 p.Gly56Ala 
  
  
  
 GEN235R003 
 missense_variant 
 c.1273A>G 
 p.Ile425Val 
  
  
  
 GEN235R004 
 missense_variant 
 c.1393T>C 
 p.Phe465Leu 
  
  
  
 GEN235R005 
 missense_variant 
 c.1648C>G 
 p.Leu550Val 
  
  
  
 GEN235R006 
 missense_variant 
 c.1815A>C 
 p.Lys605Asn 
  
  
  
 GEN235R007 
 3_prime_UTR_variant 
 c.*328A>G 
  
  
  
  
 GEN235R008 
 5KB_upstream_variant 
 c.-2192G>A;c.-2066G>A 
  
  
  
  
 GEN235R009 
 2KB_upstream_variant 
 c.-1089A>T;c.-963A>T 
  
  
  
  
 GEN235R010 
 2KB_upstream_variant 
 c.-859A>C;c.-733A>C 
  
  
  
  
 GEN235R011 
 2KB_upstream_variant 
 c.-482T>C 
  
  
  
  
 GEN235R012 
 2KB_upstream_variant 
 c.-324C>T 
  
  
  
  
 GEN235R013 
 intron_variant 
 c.-221+20C>T 
  
  
  
  
 GEN235R014 
 intron_variant 
 c.-221+133G>A 
  
  
  
  
 GEN235R015 
 intron_variant 
 IVS1a-47G>C 
  
  
  
  
 GEN235R016 
 intron_variant 
 IVS1a-25G>A 
  
  
  
  
 GEN235R017 
 intron_variant 
 c.-124+28G>A 
  
  
  
  
 GEN235R018 
 synonymous_variant 
 c.201C>T 
 p.Thr67= 
  
  
  
 GEN235R019 
 intron_variant 
 c.1076+83C>T 
  
  
  
  
 GEN235R020 
 intron_variant 
 c.1205-33C>T 
  
  
  
  
 GEN235R021 
 synonymous_variant 
 c.732G>C 
 p.Gly244= 
 De novo 
  
 Simplex 
 GEN235R022a 
 missense_variant 
 c.167G>C 
 p.Gly56Ala 
 Familial 
 Maternal 
 Unknown 
 GEN235R022b 
 indel, 2KB_upstream_variant 
  
 Promoter 
 Familial 
 Both parents 
 Unknown 
 GEN235R023 
 missense_variant 
 c.878C>T 
 p.Ser293Phe 
 Unknown 
  
 Unknown 
 GEN235R024 
 missense_variant 
 c.1726A>G 
 p.Ile576Val 
 De novo 
  
  
 GEN235R025 
 missense_variant 
 c.1273A>G 
 p.Ile425Val 
 Familial 
 Paternal 
 Multi-generational 
 GEN235R026 
 missense_variant 
 c.1534G>C 
 p.Val512Leu 
 Familial 
 Paternal 
  
 GEN235R027 
 frameshift_variant 
 c.1745dup 
 p.Thr583AsnfsTer23 
 Familial 
 Maternal 
 Simplex 

Common

Variant ID
Polymorphism
SNP ID
Allele Change
Residue Change
Population Origin
Population Stage
Author, Year
 GEN235C001 
 indel, 2KB_upstream_variant 
  
 N/A 
 N/A 
 US-Mixed 
 Discovery 
 GEN235C002 
 indel, 2KB_upstream_variant 
  
 N/A 
 N/A 
 US-Mixed; 81 new ASD trios 
 Replication 
 GEN235C003 
 intron_variant 
 rs2020934 
 c.-221+1171T>C;c.-95+1171T>C 
  
 US-Mixed; 81 new ASD trios 
 Discovery 
 GEN235C004 
 intron_variant 
 rs2066713 
 c.-220-1732C>T;c.-94-1732C>T 
  
 US-Mixed; 81 new ASD trios 
 Discovery 
 GEN235C005 
 intron_variant 
 rs2020936 
 c.-220-881C>T;c.-94-881C>T 
  
 US-Mixed; 81 new ASD trios 
 Discovery 
 GEN235C006 
 intron_variant 
 rs2020937 
 c.-220-824T>A;c.-94-824T>A 
  
 US-Mixed; 81 new ASD trios 
 Discovery 
 GEN235C007 
 5_prime_UTR_variant 
 rs6354 
 c.-185C>A;c.-59C>A 
  
 US-Mixed; 81 new ASD trios 
 Discovery 
 GEN235C008 
 microsatellite, intron_variant 
 rs57098334 
 c.343+38_343+46GGGTGGGCT[9][10][12][1];c.469+38_469+46GGGTGGGCT[9][10][12][1] 
  
 US-Mixed; 81 new ASD trios 
 Discovery 
 GEN235C009 
 intron_variant 
 rs2020942 
 c.344-965G>A;c.470-965G>A 
  
 US-Mixed; 81 new ASD trios 
 Discovery 
 GEN235C010 
 microsatellite, intron_variant 
  
 N/A 
 Intron 7 
 US-Mixed; 81 new ASD trios 
 Discovery 
 GEN235C011 
 indel, 2KB_upstream_variant 
  
 N/A 
 N/A 
 French-Caucasian 
 Replication 
 GEN235C012 
 indel, 2KB_upstream_variant 
  
 N/A 
 N/A 
 Portuguese 
 Replication 
 GEN235C013 
 microsatellite, intron_variant 
 rs57098334 
 c.343+38_343+46GGGTGGGCT[9][10][12][1];c.469+38_469+46GGGTGGGCT[9][10][12][1] 
  
 Portuguese 
 Replication 
 GEN235C014 
 microsatellite, intron_variant 
 rs57098334 
 c.343+38_343+46GGGTGGGCT[9][10][12][1];c.469+38_469+46GGGTGGGCT[9][10][12][1] 
  
 Dutch 
 Replication 
 GEN235C015 
 intron_variant 
 rs140700 
 c.838-155G>A;c.964-155G>A 
  
 US, AGRE 
 Discovery 
 GEN235C016 
 indel, 2KB_upstream_variant 
  
 N/A 
 N/A 
 US, AGRE 
 Replication 
 GEN235C017 
 indel, 2KB_upstream_variant 
  
 N/A 
 N/A 
 CPEA 
 Replication 
 GEN235C018 
 indel, 2KB_upstream_variant 
  
 N/A 
 N/A 
 US, AGRE 
 Replication 
 GEN235C019 
 intron_variant 
 rs140700 
 c.838-155G>A;c.964-155G>A 
  
 US, AGRE 
 Replication 
 GEN235C020 
 intron_variant 
 rs2020935 
 c.-221+1176A>T;c.-95+1176A>T 
  
 SARC, AGRE 
 Discovery 
 GEN235C021 
 intron_variant 
 rs140701 
 c.1205-90G>A;c.1331-90G>A 
 A/G 
 195 ASD cases & 305 controls from Korea 
 Discovery 
 GEN235C022 
 indel, 2KB_upstream_variant 
  
 N/A 
 N/A 
 76 children with high-functioning autism (HFA, IQ>80), 78 siblings, and 99 controls (all of Caucasian descent) collected in Dept. of Child and Adolescent Psychiatry at Univ. of Zurich 
 Replication 
 GEN235C023 
 2KB_upstream_variant 
 rs25531 
 c.-1936A>G;c.-1810A>G 
  
 151 Tourette probands of European ancestry with DSM-IV-TR diangoses, 858 controls from three independent sources (all controls of European ancestry) 
 Discovery 
Chromosome
CNV Locus
CNV Type
# of studies
Animal Model
17
Duplication
 3
 
17
Duplication
 2
 
17
Deletion-Duplication
 27
 

Model Summary

The serotonin transporter (SERT) knockout rat model was generated by N-ethyl-N-nitrosurea (ENU)-driven target-selected mutagenesis. Neurochemical changes in the homozygous SERT knockout rat are primarily limited to the serotonergic system, making this novel rat model potentially very useful for studying the behavioral and neurobiological consequences of disturbed 5-HT homeostasis. A multifactorial model of the SERT heterozygote combined with gestational VPA exposure serves as a model to investigate interactions between gene and environment.

References

Type
Title
Author, Year
Primary
Characterization of the serotonin transporter knockout rat: a selective change in the functioning of the serotonergic system.
Additional
Does Prenatal Valproate Interact with a Genetic Reduction in the Serotonin Transporter? A Rat Study on Anxiety and Cognition.

R_SLC6A4_1_CM_HM

Model Type: Genetic
Model Genotype: Homozygous
Mutation: High-throughput resequencing of target genes in a library of ENU-mutagenized rats (Smits et al., 2006) revealed a C to A transversion at position 3924 (relative to the start codon in ENSRNOG0000003476) in the SERT gene, resulting in a premature stop codon (TGC>TGA) in the third exon encoding the second extracellular loop.
Allele Type: Chemical mutation
Strain of Origin: Wistar/Crl
Genetic Background: Wistar
ES Cell Line: Not Applicable
Mutant ES Cell Line: Not Applicable
Model Source: Unreported

R_SLC6A4_2_CM_HT

Model Type: Genetic
Model Genotype: Heterozygous
Mutation: High-throughput resequencing of target genes in a library of ENU-mutagenized rats (Smits et al., 2006) revealed a C to A transversion at position 3924 (relative to the start codon in ENSRNOG0000003476) in the SERT gene, resulting in a premature stop codon (TGC>TGA) in the third exon encoding the second extracellular loop.
Allele Type: Chemical mutation
Strain of Origin: Wistar/Crl
Genetic Background: Wistar
ES Cell Line: Not Applicable
Mutant ES Cell Line: Not Applicable
Model Source: Unreported

R_SLC6A4_3_CM_HT_VPA

Model Type: Pharmaceutical intervention
Model Genotype: Heterozygous
Mutation: High-throughput resequencing of target genes in a library of ENU-mutagenized rats (Smits et al., 2006) revealed a C to A transversion at position 3924 (relative to the start codon in ENSRNOG0000003476) in the SERT gene, resulting in a premature stop codon (TGC>TGA) in the third exon encoding the second extracellular loop.
Allele Type: Chemical mutation
Strain of Origin: Wistar/Crl
Genetic Background: Wistar
ES Cell Line: Not Applicable
Mutant ES Cell Line: Not Applicable
Model Source: Unreported

R_SLC6A4_1_CM_HM

Category
Entity
Quantity
Experimental Paradigm
Age at Testing
Neurotransmitter release: serotonin1
Decreased
Description: Decrease in electrically evoked 5-HT release: 40% reduction in caudate putamen, 90% in hippocampus, 97% in hypothalamus
Exp Paradigm: Autoradiographic analysis
 Autoradiographic analysis
 Unreported
Neurotransmitter metabolism1
Increased
Description: Increased norepinephrine in the amygdala
Exp Paradigm: Autoradiographic analysis
 Autoradiographic analysis
 Unreported
Neurotransporter activity1
Decreased
Description: 72% reduced 5-HT reuptake in hippocampal synaptosomes; 90% reduced radiolabeled 5-HT uptake in slices; 9-fold increased basal extracellular levels of 5-HT in hippocampus; 75% and 45% decreased intracellular levels of 5-HT and 5-HIAA in hippocampus, caudate putamen, cortex and amygdala
Exp Paradigm: Synaptosomal assay; Autoradiographic analysis; Microdialysis
 Synaptosomal assay
 Unreported
Hypothermia1
Decreased
Description: Absent hypothermic response
Exp Paradigm: d-Fenfluramine-induced hypothermia
 Chemically induced hypothermia
 Unreported
Targeted expression1
Decreased
Description: Northern blot shows that premature stop codon results in nonsense-mediated decay; radiolabeled citalopram shows in situ absense of SERT protein
Exp Paradigm: Radioligand binding studies
 Radioligand binding studies
 Unreported
Targeted expression1
Decreased
Description: Northern blot shows that premature stop codon results in nonsense-mediated decay; radiolabeled citalopram shows in situ absense of SERT protein
Exp Paradigm: Northern blot
 Northern blot
 Unreported
Mortality/lethality: embryonic1
 No change
 General observations
 Unreported
Enzyme activity1
 No change
 Enzyme assay
 Unreported
Neurotransmitter metabolism1
 No change
 Autoradiographic analysis
 Unreported
 Not Reported: Circadian sleep/wake cycle, Communications, Emotion, Immune response, Learning & memory, Maternal behavior, Motor phenotype, Neuroanatomy / ultrastructure / cytoarchitecture, Physiological parameters, Repetitive behavior, Seizure, Sensory, Social behavior

R_SLC6A4_2_CM_HT

Category
Entity
Quantity
Experimental Paradigm
Age at Testing
Neurotransporter activity1
Decreased
Description: 13% reduced 5-HT reuptake in hippocampal synaptosomes; no change in intracellular levels of 5-HT and 5-HIAA in hippocampus, caudate putamen, cortex and amygdala
Exp Paradigm: Synaptosomal assay; Autoradiographic analysis
 Synaptosomal assay
 Unreported
Hypothermia1
Decreased
Description: Reduced hypothermic response
Exp Paradigm: Chemically induced hypothermia
 Chemically induced hypothermia
 Unreported
Targeted expression1
Decreased
Description: Radiolabeled citalopram shows in situ 40% reduction of SERT protein
Exp Paradigm: Radioligand binding studies
 Radioligand binding studies
 Unreported
Mortality/lethality: embryonic1
 No change
 General observations
 Unreported
Anxiety2
 No change
 Novelty-induced hypophagia
 Unreported
Anxiety2
 No change
 Elevated plus maze test
 Unreported
Cued or contextual fear conditioning: latent inhibition2
 No change
 Fear conditioning test
 Unreported
General locomotor activity2
 No change
 Elevated plus maze test
 Unreported
Neurotransmitter release: serotonin1
 No change
 Autoradiographic analysis
 Unreported
Sensorimotor gating2
 No change
 Prepulse inhibition
 Unreported
Startle response: acoustic stimulus2
 No change
 Startle response test
 Unreported
 Not Reported: Circadian sleep/wake cycle, Communications, Developmental profile, Emotion, Immune response, Learning & memory, Maternal behavior, Molecular profile, Motor phenotype, Neuroanatomy / ultrastructure / cytoarchitecture, Neurophysiology, Physiological parameters, Repetitive behavior, Seizure, Sensory, Social behavior

R_SLC6A4_3_CM_HT_VPA

Category
Entity
Quantity
Experimental Paradigm
Age at Testing
Sensorimotor gating1
Decreased
Description: Decreased prepulse inhibition
Exp Paradigm: Prepulse inhibition
 Prepulse inhibition
 Unreported
Anxiety1
Increased
Description: Decrease time in open arms, decreased stretch attend; increased latency in novelty-suppressed feeding
Exp Paradigm: Elevated plus maze test; Novelty-suppressed feeding-Elevated plus maze test
 Elevated plus maze test
 Unreported
Anxiety1
Increased
Description: Decrease time in open arms, decreased stretch attend; increased latency in novelty-suppressed feeding
Exp Paradigm: Elevated plus maze test; Novelty-suppressed feeding- Novelty-suppressed feeding paradigm
 Novelty-induced hypophagia
 Unreported
Cued or contextual fear conditioning: latent inhibition1
 No change
 Fear conditioning test
 Unreported
General locomotor activity1
 No change
 Elevated plus maze test
 Unreported
Startle response: acoustic stimulus1
 No change
 Startle response test
 Unreported
 Not Reported: Circadian sleep/wake cycle, Communications, Developmental profile, Immune response, Maternal behavior, Molecular profile, Neuroanatomy / ultrastructure / cytoarchitecture, Neurophysiology, Physiological parameters, Repetitive behavior, Seizure, Social behavior


Interactor Symbol Interactor Name Interactor Organism Entrez ID Uniprot ID Interaction Type Evidence Reference
FMR1 fragile X mental retardation 1 2332 G8JLE9 PAR-CLIP
Ascano M Jr , et al. 2012
NSF N-ethylmaleimide-sensitive factor 4905 P46459 Co-localization; IP/WB
Iwata K , et al. 2014
SNCA synuclein, alpha (non A4 component of amyloid precursor) 6622 P37840 IP/WB
IP/WB; Immunofluorescence
Wersinger C and Sidhu A 2009
SNCG Gamma-synuclein 6623 O76070 IP/WB
Wersinger C and Sidhu A 2009
CALR calreticulin 811 P27797 IP/WB
Tate CG , et al. 1999
CANX Calnexin 821 P24643 IP/WB
Tate CG , et al. 1999
STX1A syntaxin 1A (brain) 116470 P32851 IP/WB
Quick MW 2002

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