1-42929018-G-A

Variant names:

• chr1-42929018-G-A
• rs80359826
• NM_006516.4:c.988C>T
• SLC2A1 p.Arg330*

GermlineCancer (beta)

Variant summary

Our verdict is Pathogenic.

+12 Pathogenic

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 12 classification points (ACGS-UK Somatic Oncogenicity v2025). O1_ModerateO2_Very_StrongO3_Moderate

The NM_006516.4(SLC2A1):c.988C>T (p.Arg330*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant is predicted to lead to nonsense-mediated mRNA decay (NMD). The gene SLC2A1 is a tumor suppressor gene (CancerMine: 3 TSG, 14 oncogene, 1 driver citations). The gene SLC2A1 is a known oncogene (CancerMine: 3 TSG, 14 oncogene, 1 driver citations). The gene SLC2A1 is a cancer driver gene (CancerMine: 3 TSG, 14 oncogene, 1 driver citations). The variant is absent from the gnomAD population database at sites with sufficient sequencing coverage. In-silico predictor (BayesDel (noAF)) classifies this variant as likely damaging/oncogenic. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic/Likely Pathogenic (★★). The variant has been observed in cBioPortal in 1 sample across 1 study and 1 cancer type; somatic enrichment level: NONE (Observed in at most one deduplicated cBioPortal case.). This exact variant is curated in the UniProt human variants database as Uncertain Significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SLC2A1 NM_006516.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:10 O:1
• Conservation: PhyloP100: 4.55
• Publications: 3 publications found

Genes affected

SLC2A1 (HGNC:11005): (solute carrier family 2 member 1) This gene encodes a major glucose transporter in the mammalian blood-brain barrier. The encoded protein is found primarily in the cell membrane and on the cell surface, where it can also function as a receptor for human T-cell leukemia virus (HTLV) I and II. Mutations in this gene have been found in a family with paroxysmal exertion-induced dyskinesia. [provided by RefSeq, Apr 2013]

SLC2A1 Gene-Disease associations (from GenCC):

• encephalopathy due to GLUT1 deficiency

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, G2P
• GLUT1 deficiency syndrome

  Inheritance: SD, AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, ClinGen
• childhood onset GLUT1 deficiency syndrome 2

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
• dystonia 9

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Orphanet
• epilepsy, idiopathic generalized, susceptibility to, 12

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• childhood absence epilepsy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary cryohydrocytosis with reduced stomatin

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• myoclonic-astatic epilepsy

  Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Pathogenic. The variant received 12 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O1Established oncogenic variant		TSG gene: ClinVar germline P/LP ★★+ — Moderate (O1); O1 contributing sources (2.0 pts): ClinVar germline P/LP in TSG (★★)
	O2Null variant in tumour suppressor gene		Frameshift/stop-gained, NMD predicted, LoF oncogenic mechanism — O2 very strong (+8); Use caution in the presence of multiple transcripts; Gene confirmed as TSG in CancerMine (TSG: 3 citations, oncogene: 14 citations, driver: 1 citations).; Frameshift/stop-gained. NMD predicted: true. LoF mechanism: true. Downstream pathogenic count: 0.
	O3Absent or very rare in population		Absent or extremely rare in gnomAD (AC ≤ 2) — O3 moderate; GnomAD: AF = absent, AC = 0 — absent/extremely rare (O3 moderate [+2])

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_006516.4. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	SLC2A1 NM_006516.4	MANE Select	c.988C>T p.Arg330*	stop_gained	Exon 8 of 10	Prot: NP_006507.2 UniProt:

SLC2A1 NM_006516.4

MANE Select

HGVSc / HGVSpc.988C>Tp.Arg330*

Exon rankExon 8 of 10

stop_gained

Prot: NP_006507.2UniProt: P11166

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	SLC2A1 ENST00000426263.10	TSL:1MANE Select	c.988C>T p.Arg330*	stop_gained	Exon 8 of 10	Prot: ENSP00000416293.2 UniProt:
	SLC2A1 ENST00000889577.1		c.985C>T p.Arg329*	stop_gained	Exon 8 of 10	Prot: ENSP00000559636.1 UniProt:
	SLC2A1 ENST00000958848.1		c.988C>T p.Arg330*	stop_gained	Exon 8 of 10	Prot: ENSP00000628907.1 UniProt:

SLC2A1 ENST00000426263.10

TSL:1MANE Select

HGVSc / HGVSpc.988C>Tp.Arg330*

Exon rankExon 8 of 10

stop_gained

Prot: ENSP00000416293.2UniProt: P11166

SLC2A1 ENST00000889577.1

HGVSc / HGVSpc.985C>Tp.Arg329*

Exon rankExon 8 of 10

stop_gained

Prot: ENSP00000559636.1UniProt: A0ACI8RFT3

SLC2A1 ENST00000958848.1

HGVSc / HGVSpc.988C>Tp.Arg330*

Exon rankExon 8 of 10

stop_gained

Prot: ENSP00000628907.1UniProt: A0ACI8V0G7

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 4 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:33
GnomAD4 exome	AF:	AC:	Hom:	AN:	Cov:32
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:33
ALFA (dbGaP/dbSNP Allele Frequency Aggregator)	AF: 0.0000432	AC:1	Hom:0	AN:23172	Cov:

Showing 4 sources

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	not provided (3)
2	-	-	Encephalopathy due to GLUT1 deficiency (3)
1	-	-	Childhood onset GLUT1 deficiency syndrome 2 (1)
1	-	-	Dystonia 9;C1837206:Hereditary cryohydrocytosis with reduced stomatin;C1842534:Childhood onset GLUT1 deficiency syndrome 2;C4551966:Encephalopathy due to GLUT1 deficiency (1)
1	-	-	Epilepsy;C4551563:Microcephaly;CN228659:intellectual deficiency (1)
1	-	-	GLUT1 deficiency syndrome 1, autosomal recessive (1)
1	-	-	Inborn genetic diseases (1)

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Pathogenic	35
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.51
CADD	Pathogenic	47
DANN	Uncertain	1.0
Eigen	Uncertain	0.67
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Uncertain	0.94	D
GPN-Star LLR	N/A	-10
GPN-Star score	N/A	10
Mutation Taster	N/A	2/198	disease causing (ClinVar)
PhyloP100	Uncertain	4.5
RBP_binding_hub_radar	N/A	0.92
RBP_regulation_power_radar	N/A	2.6

Showing 14 of 14 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.040
SpliceAI score (max)	Benign	0.0	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs80359826;

hg19: chr1-43394689;

COSMIC: COSV65287339;

COSMIC: COSV65287339;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar