rs372226064

Positions:

• chr2-189036633-T-C

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BS1_Supporting BS2

The NM_000393.5(COL5A2):​c.4096A>G​(p.Met1366Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000253 in 1,461,184 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000025 (0 hom.)
• Consequence: COL5A2 NM_000393.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 8.02

Genes affected

COL5A2 (HGNC:2210): (collagen type V alpha 2 chain) This gene encodes an alpha chain for one of the low abundance fibrillar collagens. Fibrillar collagen molecules are trimers that can be composed of one or more types of alpha chains. Type V collagen is found in tissues containing type I collagen and appears to regulate the assembly of heterotypic fibers composed of both type I and type V collagen. This gene product is closely related to type XI collagen and it is possible that the collagen chains of types V and XI constitute a single collagen type with tissue-specific chain combinations. Mutations in this gene are associated with Ehlers-Danlos syndrome, types I and II. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BS1: Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.0000253 (37/1461184) while in subpopulation NFE AF= 0.0000333 (37/1111440). AF 95% confidence interval is 0.0000246. There are 0 homozygotes in gnomad4_exome. There are 19 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High AC in GnomAdExome4 at 37 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL5A2	NM_000393.5	c.4096A>G	p.Met1366Val	missense_variant	52/54	ENST00000374866.9	NP_000384.2
COL5A2	XM_011510573.4	c.3958A>G	p.Met1320Val	missense_variant	55/57		XP_011508875.1
COL5A2	XM_047443251.1	c.3958A>G	p.Met1320Val	missense_variant	57/59		XP_047299207.1
COL5A2	XM_047443252.1	c.3958A>G	p.Met1320Val	missense_variant	56/58		XP_047299208.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL5A2	ENST00000374866.9	c.4096A>G	p.Met1366Val	missense_variant	52/54	1	NM_000393.5	ENSP00000364000.3
COL5A2	ENST00000618828.1	c.2935A>G	p.Met979Val	missense_variant	45/47	5		ENSP00000482184.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000253 AC: 37 AN: 1461184 Hom.: 0 Cov.: 31 AF XY: 0.0000261 AC XY: 19 AN XY: 726956

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: 0.0000333

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.00000378

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 09, 2016

The p.M1366V variant (also known as c.4096A>G), located in coding exon 52 of the COL5A2 gene, results from an A to G substitution at nucleotide position 4096. The methionine at codon 1366 is replaced by valine, an amino acid with highly similar properties. This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Ehlers-Danlos syndrome, classic type, 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 01, 2021

This sequence change replaces methionine with valine at codon 1366 of the COL5A2 protein (p.Met1366Val). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and valine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with COL5A2-related conditions. ClinVar contains an entry for this variant (Variation ID: 519680). 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. -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Benign	0.24	T;T;T
Eigen	Uncertain	0.26
Eigen_PC	Uncertain	0.40
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.81	.;T;T
M_CAP	Benign	0.041	D
MetaRNN	Uncertain	0.45	T;T;T
MetaSVM	Benign	-0.53	T
MutationAssessor	Pathogenic	2.9	M;.;M
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.7	N;.;.
REVEL	Uncertain	0.34
Sift	Uncertain	0.0070	D;.;.
Sift4G	Uncertain	0.012	D;D;.
Polyphen		0.31	B;.;B
Vest4		0.56
MVP		0.72
MPC		0.26
ClinPred		0.92	D
GERP RS		6.0
Varity_R		0.68
gMVP		0.54

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: rs372226064; hg19: chr2-189901359;