17-28367455-T-C

Variant names:

• chr17-28367455-T-C
• rs1755772052
• NM_000638.4:c.1351A>G

Variant summary

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

The NM_000638.4(VTN):​c.1351A>G​(p.Thr451Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T451S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: VTN NM_000638.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.45

Genes affected

VTN (HGNC:12724): (vitronectin) The protein encoded by this gene functions in part as an adhesive glycoprotein. Differential expression of this protein can promote either cell adhesion or migration as it links cells to the extracellular matrix through a variety of ligands. These ligands include integrins, plasminogen activator inhibitor-1, and urokinase plasminogen activator receptor. This secreted protein can be present in the plasma as a monomer or dimer and forms a multimer in the extracellular matrix of several tissues. This protein also inhibits the membrane-damaging effect of the terminal cytolytic complement pathway and binds to several serpin serine protease inhibitors. This protein can also promote extracellular matrix degradation and thus plays a role in tumorigenesis. It is involved in a variety of other biological processes such as the regulation of the coagulation pathway, wound healing, and tissue remodeling. The heparin-binding domain of this protein give it anti-microbial properties. It is also a lipid binding protein that forms a principal component of high density lipoprotein. [provided by RefSeq, Aug 2020]

ENSG00000273171 (HGNC:):

SARM1 (HGNC:17074): (sterile alpha and TIR motif containing 1) Enables NAD+ nucleotidase, cyclic ADP-ribose generating and identical protein binding activity. Involved in NAD catabolic process; positive regulation of neuron death; and response to axon injury. Located in mitochondrion. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
VTN	NM_000638.4	c.1351A>G	p.Thr451Ala	missense_variant	Exon 8 of 8	ENST00000226218.9	NP_000629.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
VTN	ENST00000226218.9	c.1351A>G	p.Thr451Ala	missense_variant	Exon 8 of 8	1	NM_000638.4	ENSP00000226218.4
ENSG00000273171	ENST00000555059.2	c.325A>G	p.Thr109Ala	missense_variant	Exon 2 of 4	4		ENSP00000452347.3
SARM1	ENST00000379061.8	n.170+2290T>C		intron_variant	Intron 2 of 10	2
ENSG00000258924	ENST00000591482.1	n.555+6608T>C		intron_variant	Intron 5 of 5	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Benign	-0.043	T
BayesDel_noAF	Benign	-0.30
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.29	.;T
Eigen	Pathogenic	0.76
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.74	T;D
M_CAP	Benign	0.031	D
MetaRNN	Uncertain	0.66	D;D
MetaSVM	Benign	-1.2	T
MutationAssessor	Uncertain	2.2	.;M
PhyloP100		7.5
PrimateAI	Uncertain	0.57	T
PROVEAN	Uncertain	-3.3	.;D
REVEL	Uncertain	0.36
Sift	Pathogenic	0.0	.;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	.;D
Vest4		0.57
MutPred		0.50		.;Loss of sheet (P = 0.0104);
MVP		0.32
MPC		0.78
ClinPred		0.99	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.73
gMVP		0.63

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

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

Publications

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Other links and lift over

dbSNP: rs1755772052; hg19: chr17-26694476;