rs587777284

Variant names:

• chr7-120840110-C-G
• rs587777284
• NM_012338.4:c.67-1G>C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_012338.4(TSPAN12):​c.67-1G>C variant causes a splice acceptor, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TSPAN12 NM_012338.4 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 6.09

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 Pathogenic. Variant got 12 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 4.4, offset of 14, new splice context is: ccccacttaatgtccatcAGtgt. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 7-120840110-C-G is Pathogenic according to our data. Variant chr7-120840110-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 126504.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr7-120840110-C-G is described in Lovd as [Likely_pathogenic]. Variant chr7-120840110-C-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSPAN12	NM_012338.4	c.67-1G>C		splice_acceptor_variant, intron_variant	Intron 2 of 7	ENST00000222747.8	NP_036470.1
TSPAN12	XM_005250239.4	c.67-1G>C		splice_acceptor_variant, intron_variant	Intron 3 of 8		XP_005250296.1
TSPAN12	XM_047420095.1	c.67-1G>C		splice_acceptor_variant, intron_variant	Intron 3 of 8		XP_047276051.1
TSPAN12	XM_047420096.1	c.67-1G>C		splice_acceptor_variant, intron_variant	Intron 3 of 7		XP_047276052.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSPAN12	ENST00000222747.8	c.67-1G>C		splice_acceptor_variant, intron_variant	Intron 2 of 7	1	NM_012338.4	ENSP00000222747.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Exudative vitreoretinopathy 5 Pathogenic:1

May 14, 2012

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not provided Pathogenic:1

Mar 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects an acceptor splice site in intron 2 of the TSPAN12 gene. RNA analysis indicates that disruption of this splice site induces altered splicing and may result in an absent or disrupted protein product. This variant is not present in population databases (gnomAD no frequency). Disruption of this splice site has been observed in individuals with exudative vitreoretinopathy (PMID: 22427576; Invitae). ClinVar contains an entry for this variant (Variation ID: 126504). Studies have shown that disruption of this splice site results in skipping of exon 3 and introduces a premature termination codon (PMID: 22427576). The resulting mRNA is expected to undergo nonsense-mediated decay. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	30
DANN	Uncertain	0.99
Eigen	Pathogenic	0.99
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Uncertain	0.97	D
GERP RS		4.8

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.93
SpliceAI score (max)		0.95		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.95		Position offset: -1

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

Publications

LitVar

Other links and lift over

dbSNP: rs587777284; hg19: chr7-120480164;