7-120788633-C-T

Variant names:

• chr7-120788633-C-T
• rs1207228302
• NM_012338.4:c.877G>A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_012338.4(TSPAN12):​c.877G>A​(p.Ala293Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,818 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: TSPAN12 NM_012338.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.14

Genes affected

TSPAN12 (HGNC:21641): (tetraspanin 12) The protein encoded by this gene is a member of the transmembrane 4 superfamily, also known as the tetraspanin family. Most of these members are cell-surface proteins that are characterized by the presence of four hydrophobic domains. The proteins mediate signal transduction events that play a role in the regulation of cell development, activation, growth and motility. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.19435215).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSPAN12	NM_012338.4	c.877G>A	p.Ala293Thr	missense_variant	Exon 8 of 8	ENST00000222747.8	NP_036470.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSPAN12	ENST00000222747.8	c.877G>A	p.Ala293Thr	missense_variant	Exon 8 of 8	1	NM_012338.4	ENSP00000222747.3
TSPAN12	ENST00000415871.5	c.877G>A	p.Ala293Thr	missense_variant	Exon 9 of 9	5		ENSP00000397699.1
TSPAN12	ENST00000450414.5	n.*727G>A		non_coding_transcript_exon_variant	Exon 6 of 6	5		ENSP00000397411.1
TSPAN12	ENST00000450414.5	n.*727G>A		3_prime_UTR_variant	Exon 6 of 6	5		ENSP00000397411.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461818 Hom.: 0 Cov.: 57 AF XY: 0.00000413 AC XY: 3 AN XY: 727206

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000899

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000329 Hom.: 0

Bravo AF: 0.0000113

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Nov 21, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 1462314). This variant has not been reported in the literature in individuals affected with TSPAN12-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 293 of the TSPAN12 protein (p.Ala293Thr). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.030	T
BayesDel_noAF	Benign	-0.28
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Benign	0.099	T;T
Eigen	Uncertain	0.22
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.81	.;T
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.19	T;T
MetaSVM	Benign	-0.88	T
MutationAssessor	Benign	0.81	L;L
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	-0.33	N;N
REVEL	Benign	0.095
Sift	Uncertain	0.0050	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.76	P;P
Vest4		0.14
MutPred		0.24		Loss of helix (P = 0.0237);Loss of helix (P = 0.0237);
MVP		0.24
MPC		0.11
ClinPred		0.56	D
GERP RS		5.8
Varity_R		0.10
gMVP		0.65

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs1207228302; hg19: chr7-120428687;