chr1-42929016-TCG-CCC

Variant names:

• chr1-42929016-TCG-CCC
• NM_006516.4:c.988_990delCGAinsGGG
• SLC2A1 p.Arg330Gly

GermlineCancer (beta)

Variant summary

Our verdict is Uncertain significance.

+5 Uncertain · Hot

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 5 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_ModerateO7_ModerateO8_Supporting

The NM_006516.4(SLC2A1):c.988_990delCGAinsGGG (p.Arg330Gly) variant causes a missense change. 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). Note: allele frequency estimates from gnomAD may be inaccurate for this variant type (MNP or indel longer than 3 bp) due to technology limitations. The variant is absent from the gnomAD population database at sites with sufficient sequencing coverage. The affected nucleotide is highly conserved across species (PhyloP 100-way vertebrate score: 7.52). No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Other variants at the same amino acid position have been reported in ClinVar (not pathogenic): p.R330Q: Uncertain_significance (ClinVar VariationId 3618512, 2 stars); p.R330= (synonymous): Likely_benign (ClinVar VariationId 702407, 1 star)

• Frequency: Genomes: not found (cov: 33)
• Consequence: SLC2A1 NM_006516.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.52
• Publications: 0 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: Uncertain_significance. The variant received 5 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	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])
	O7Mutational hotspot or critical domain		Moderate: ≥10 same AA change, or strong functional domain signal; No cancerhotspots.org hit at this position; UniProt domain: 4 pathogenic, 0 benign (OR vs. background: 45.0).; ±8 AA neighbourhood: 11 pathogenic, 0 benign (OR vs. background: 115.0); Variant does not impact splicing — splice-hotspot path not applicable
	O8Missense constraint in gene or region		Missense in gene/domain constrained for missense variation where missense is common disease mechanism (O8 supporting); Gene/disease mechanism: missense is a common mechanism of oncogenesis; gnomAD missense Z-score: 4.68 (threshold ≥3.09 for constraint); Domain-level constraint: variant is in a critically constrained functional domain (IS_AT_CRITICAL_DOMAIN)

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.988_990delCGAinsGGG p.Arg330Gly	missense	N/A	Prot: NP_006507.2 UniProt:

SLC2A1 NM_006516.4

MANE Select

HGVSc / HGVSpc.988_990delCGAinsGGGp.Arg330Gly

Exon rankN/A

missense

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.988_990delCGAinsGGG p.Arg330Gly	missense	N/A	Prot: ENSP00000416293.2 UniProt:
	SLC2A1 ENST00000889577.1		c.985_987delCGAinsGGG p.Arg329Gly	missense	N/A	Prot: ENSP00000559636.1 UniProt:
	SLC2A1 ENST00000958848.1		c.988_990delCGAinsGGG p.Arg330Gly	missense	N/A	Prot: ENSP00000628907.1 UniProt:

SLC2A1 ENST00000426263.10

TSL:1MANE Select

HGVSc / HGVSpc.988_990delCGAinsGGGp.Arg330Gly

Exon rankN/A

missense

Prot: ENSP00000416293.2UniProt: P11166

SLC2A1 ENST00000889577.1

HGVSc / HGVSpc.985_987delCGAinsGGGp.Arg329Gly

Exon rankN/A

missense

Prot: ENSP00000559636.1UniProt: A0ACI8RFT3

SLC2A1 ENST00000958848.1

HGVSc / HGVSpc.988_990delCGAinsGGGp.Arg330Gly

Exon rankN/A

missense

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 2 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:33
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:33

Showing 2 sources

Tested, but no data found:GnomAD4 exomeIf GnomAD4 is missing, the position is probably not covered by the project.

ClinVar

Not reported in ClinVar

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
PhyloP100	Pathogenic	7.5

Showing 1 of 1 scores

Splicing Scores

No splicing scores have been computed for this variant.

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

hg19: chr1-43394687;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar