7-80458829-T-G

Variant names:

• chr7-80458829-T-G
• rs1422975389
• NM_001102386.3:c.907A>C

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001102386.3(GNAT3):​c.907A>C​(p.Ile303Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000695 in 1,438,030 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: GNAT3 NM_001102386.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.26
• Publications: 0 publications found

Genes affected

GNAT3 (HGNC:22800): (G protein subunit alpha transducin 3) Sweet, bitter, and umami tastes are transmitted from taste receptors by a specific guanine nucleotide binding protein. The protein encoded by this gene is the alpha subunit of this heterotrimeric G protein, which is found not only in the oral epithelium but also in gut tissues. Variations in this gene have been linked to metabolic syndrome. [provided by RefSeq, Dec 2015]

CD36 (HGNC:1663): (CD36 molecule (CD36 blood group)) The protein encoded by this gene is the fourth major glycoprotein of the platelet surface and serves as a receptor for thrombospondin in platelets and various cell lines. Since thrombospondins are widely distributed proteins involved in a variety of adhesive processes, this protein may have important functions as a cell adhesion molecule. It binds to collagen, thrombospondin, anionic phospholipids and oxidized LDL. It directly mediates cytoadherence of Plasmodium falciparum parasitized erythrocytes and it binds long chain fatty acids and may function in the transport and/or as a regulator of fatty acid transport. Mutations in this gene cause platelet glycoprotein deficiency. Multiple alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Feb 2014]

CD36 Gene-Disease associations (from GenCC):

• platelet-type bleeding disorder 10

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.886

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GNAT3	NM_001102386.3	c.907A>C	p.Ile303Leu	missense_variant	Exon 8 of 8	ENST00000398291.4	NP_001095856.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GNAT3	ENST00000398291.4	c.907A>C	p.Ile303Leu	missense_variant	Exon 8 of 8	1	NM_001102386.3	ENSP00000381339.3
CD36	ENST00000435819.5	c.-477-27638T>G		intron_variant	Intron 1 of 16	2		ENSP00000399421.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.95e-7 AC: 1 AN: 1438030 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 713716

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 32428

American (AMR) AF: 0.00 AC: 0 AN: 40038

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25616

East Asian (EAS) AF: 0.00 AC: 0 AN: 39328

South Asian (SAS) AF: 0.00 AC: 0 AN: 80890

European-Finnish (FIN) AF: 0.0000190 AC: 1 AN: 52684

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5710

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1101816

Other (OTH) AF: 0.00 AC: 0 AN: 59520

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Apr 18, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.907A>C (p.I303L) alteration is located in exon 8 (coding exon 8) of the GNAT3 gene. This alteration results from a A to C substitution at nucleotide position 907, causing the isoleucine (I) at amino acid position 303 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.68	D
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.92	D
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.89	D
MetaSVM	Uncertain	0.73	D
MutationAssessor	Benign	1.8	L
PhyloP100		6.3
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-1.8	N
REVEL	Pathogenic	0.67
Sift	Uncertain	0.0010	D
Sift4G	Benign	0.097	T
Polyphen		0.98	D
Vest4		0.65
MutPred		0.80		Loss of catalytic residue at I303 (P = 0.0584);
MVP		0.95
MPC		0.12
ClinPred		0.97	D
GERP RS		5.5
Varity_R		0.61
gMVP		0.63
Mutation Taster		=59/41	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: rs1422975389; hg19: chr7-80088145;