NM_003042.4:c.1435C>T

Variant names:

• chr3-11033647-C-T
• rs745529755
• NM_003042.4:c.1435C>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_003042.4(SLC6A1):​c.1435C>T​(p.Arg479*) variant causes a stop gained change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. R479R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLC6A1 NM_003042.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 4.10
• Publications: 2 publications found

Genes affected

SLC6A1 (HGNC:11042): (solute carrier family 6 member 1) The protein encoded by this gene is a gamma-aminobutyric acid (GABA) transporter that localizes to the plasma membrane. The encoded protein removes GABA from the synaptic cleft, restoring it to presynaptic terminals. [provided by RefSeq, Jan 2017]

SLC6A1 Gene-Disease associations (from GenCC):

• epilepsy with myoclonic atonic seizures

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Illumina, G2P, Labcorp Genetics (formerly Invitae)
• myoclonic-astatic epilepsy

  Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-11033647-C-T is Pathogenic according to our data. Variant chr3-11033647-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 542201.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003042.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC6A1	NM_003042.4	MANE Select	c.1435C>T	p.Arg479*	stop_gained	Exon 14 of 16	NP_003033.3
	SLC6A1	NM_001348250.2		c.1435C>T	p.Arg479*	stop_gained	Exon 14 of 16	NP_001335179.1
	SLC6A1	NM_001348251.2		c.1075C>T	p.Arg359*	stop_gained	Exon 14 of 16	NP_001335180.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC6A1	ENST00000287766.10	TSL:1 MANE Select	c.1435C>T	p.Arg479*	stop_gained	Exon 14 of 16	ENSP00000287766.4
	SLC6A1	ENST00000698198.1		c.1507C>T	p.Arg503*	stop_gained	Exon 12 of 14	ENSP00000513602.1
	SLC6A1	ENST00000644803.1		c.1462C>T	p.Arg488*	stop_gained	Exon 12 of 14	ENSP00000494469.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Epilepsy with myoclonic atonic seizures Pathogenic:2

Aug 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Arg479*) in the SLC6A1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SLC6A1 are known to be pathogenic (PMID: 25865495). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SLC6A1-related conditions. ClinVar contains an entry for this variant (Variation ID: 542201). For these reasons, this variant has been classified as Pathogenic.

Feb 01, 2022

Clinical Genetics Laboratory, University Hospital Schleswig-Holstein

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

not provided Pathogenic:1

Jul 22, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 29455050)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	43
DANN	Uncertain	1.0
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Uncertain	0.97	D
PhyloP100		4.1
Vest4		0.89
GERP RS		4.1
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs745529755; hg19: chr3-11075333; COSMIC: COSV55113671; COSMIC: COSV55113671;