5-83520540-A-C

Position:

• chr5-83520540-A-C

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS2

The NM_004385.5(VCAN):​c.2234A>C​(p.Lys745Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00022 in 1,614,036 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00018 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00022 (1 hom.)
• Consequence: VCAN NM_004385.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:4
• Conservation: PhyloP100: 0.0250

Genes affected

VCAN (HGNC:2464): (versican) This gene is a member of the aggrecan/versican proteoglycan family. The protein encoded is a large chondroitin sulfate proteoglycan and is a major component of the extracellular matrix. This protein is involved in cell adhesion, proliferation, proliferation, migration and angiogenesis and plays a central role in tissue morphogenesis and maintenance. Mutations in this gene are the cause of Wagner syndrome type 1. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2009]

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.024023116).
• BP6: Variant 5-83520540-A-C is Benign according to our data. Variant chr5-83520540-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 259362.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Benign=1, Uncertain_significance=1}.
• BS2: High AC in GnomAd4 at 27 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
VCAN	NM_004385.5	c.2234A>C	p.Lys745Thr	missense_variant	7/15	ENST00000265077.8	NP_004376.2
VCAN	NM_001164098.2	c.2234A>C	p.Lys745Thr	missense_variant	7/14		NP_001157570.1
VCAN	NM_001126336.3	c.1042+8144A>C		intron_variant			NP_001119808.1
VCAN	NM_001164097.2	c.1042+8144A>C		intron_variant			NP_001157569.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
VCAN	ENST00000265077.8	c.2234A>C	p.Lys745Thr	missense_variant	7/15	1	NM_004385.5	ENSP00000265077

Frequencies

GnomAD3 genomes AF: 0.000177 AC: 27 AN: 152234 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.000577

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000309

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.000247 AC: 62 AN: 250720 Hom.: 0 AF XY: 0.000236 AC XY: 32 AN XY: 135550

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000550

Gnomad ASJ exome AF: 0.000298

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000196

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000291

Gnomad OTH exome AF: 0.000164

GnomAD4 exome AF: 0.000224 AC: 328 AN: 1461684 Hom.: 1 Cov.: 33 AF XY: 0.000250 AC XY: 182 AN XY: 727154

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000447

Gnomad4 ASJ exome AF: 0.000230

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000267

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000233

Gnomad4 OTH exome AF: 0.000248

GnomAD4 genome AF: 0.000177 AC: 27 AN: 152352 Hom.: 0 Cov.: 33 AF XY: 0.000174 AC XY: 13 AN XY: 74500

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.000577

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000309

Gnomad4 OTH AF: 0.000946

Alfa AF: 0.000280 Hom.: 0

Bravo AF: 0.000196

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000349 AC: 3

ExAC AF: 0.000239 AC: 29

EpiCase AF: 0.000545

EpiControl AF: 0.000652

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:4

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Wagner syndrome Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jun 14, 2016	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jun 14, 2016	- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 14, 2024

This sequence change replaces lysine, which is basic and polar, with threonine, which is neutral and polar, at codon 745 of the VCAN protein (p.Lys745Thr). This variant is present in population databases (rs144502710, gnomAD 0.05%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with VCAN-related conditions. ClinVar contains an entry for this variant (Variation ID: 259362). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

-

- -

Vitreoretinopathy Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.091
BayesDel_addAF	Benign	-0.44	T
BayesDel_noAF	Benign	-0.53
CADD	Benign	1.3
DANN	Uncertain	0.99
DEOGEN2	Benign	0.22	T;.;T
Eigen	Benign	-0.41
Eigen_PC	Benign	-0.58
FATHMM_MKL	Benign	0.17	N
LIST_S2	Benign	0.62	T;T;T
M_CAP	Benign	0.0097	T
MetaRNN	Benign	0.024	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.6	L;L;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-1.4	N;N;N
REVEL	Benign	0.041
Sift	Uncertain	0.0010	D;D;D
Sift4G	Benign	0.084	T;T;T
Polyphen		0.96	D;P;.
Vest4		0.14
MVP		0.22
MPC		0.095
ClinPred		0.028	T
GERP RS		2.5
Varity_R		0.13
gMVP		0.14

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: rs144502710; hg19: chr5-82816359;