rs766923947

Variant names:

• chr8-15659556-G-A
• rs766923947
• NM_006765.4:c.476G>A

Your query was ambiguous. Multiple possible variants found:

• chr8-15659556-G-A
• chr8-15659556-G-C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006765.4(TUSC3):​c.476G>A​(p.Arg159Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,126 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: TUSC3 NM_006765.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.37
• Publications: 0 publications found

Genes affected

TUSC3 (HGNC:30242): (tumor suppressor candidate 3) This gene encodes a protein that has been associated with several biological functions including cellular magnesium uptake, protein glycosylation and embryonic development. This protein localizes to the endoplasmic reticulum and acts as a component of the oligosaccharyl transferase complex which is responsible for N-linked protein glycosylation. This gene is a candidate tumor suppressor gene. Homozygous mutations in this gene are associated with autosomal recessive nonsyndromic mental retardation-7 and in the proliferation and invasiveness of several cancers including metastatic pancreatic cancer, ovarian cancer and glioblastoma multiform. [provided by RefSeq, Oct 2017]

TUSC3 Gene-Disease associations (from GenCC):

• intellectual disability

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• intellectual disability, autosomal recessive 7

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.070925).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006765.4. 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
	TUSC3	NM_006765.4	MANE Select	c.476G>A	p.Arg159Lys	missense	Exon 4 of 11	NP_006756.2
	TUSC3	NM_001413679.1		c.476G>A	p.Arg159Lys	missense	Exon 4 of 9	NP_001400608.1
	TUSC3	NM_001413684.1		c.476G>A	p.Arg159Lys	missense	Exon 4 of 10	NP_001400613.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TUSC3	ENST00000503731.6	TSL:1 MANE Select	c.476G>A	p.Arg159Lys	missense	Exon 4 of 11	ENSP00000424544.1
	TUSC3	ENST00000382020.8	TSL:1	c.476G>A	p.Arg159Lys	missense	Exon 4 of 10	ENSP00000371450.4
	TUSC3	ENST00000506802.5	TSL:5	c.476G>A	p.Arg159Lys	missense	Exon 4 of 9	ENSP00000425777.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461126 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 726870

African (AFR) AF: 0.00 AC: 0 AN: 33458

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26118

East Asian (EAS) AF: 0.00 AC: 0 AN: 39652

South Asian (SAS) AF: 0.00 AC: 0 AN: 86244

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53098

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111694

Other (OTH) AF: 0.00 AC: 0 AN: 60376

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Sep 26, 2016

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Inborn genetic diseases Uncertain:1

May 21, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.476G>A (p.R159K) alteration is located in exon 4 (coding exon 4) of the TUSC3 gene. This alteration results from a G to A substitution at nucleotide position 476, causing the arginine (R) at amino acid position 159 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.63
CADD	Benign	21
DANN	Benign	0.82
DEOGEN2	Benign	0.073	T
Eigen	Benign	-0.45
Eigen_PC	Benign	-0.10
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.0015	T
MetaRNN	Benign	0.071	T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	-3.0	N
PhyloP100		7.4
PrimateAI	Uncertain	0.64	T
PROVEAN	Benign	2.3	N
REVEL	Benign	0.14
Sift	Benign	1.0	T
Sift4G	Benign	1.0	T
Polyphen		0.0	B
Vest4		0.067
MutPred		0.40		Gain of methylation at R159 (P = 0.0134)
MVP		0.12
MPC		0.26
ClinPred		0.59	D
GERP RS		4.4
Varity_R		0.56
gMVP		0.45
Mutation Taster		=82/18	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs766923947; hg19: chr8-15517065; COSMIC: COSV101141268;