rs767372665

Positions:

• chr9-134818700-C-G
• chr9-134818700-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_000093.5(COL5A1):​c.4275C>G​(p.Ile1425Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,458,118 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I1425F) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: COL5A1 NM_000093.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.61

Genes affected

COL5A1 (HGNC:2209): (collagen type V alpha 1 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. The encoded procollagen protein occurs commonly as the heterotrimer pro-alpha1(V)-pro-alpha1(V)-pro-alpha2(V). Mutations in this gene are associated with Ehlers-Danlos syndrome, types I and II. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, May 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), COL5A1. . Gene score misZ 2.0682 (greater than the threshold 3.09). Trascript score misZ 4.1823 (greater than threshold 3.09). GenCC has associacion of gene with Ehlers-Danlos syndrome, classic type, 1, arterial disorder, Ehlers-Danlos syndrome, classic type.
• BP4: Computational evidence support a benign effect (MetaRNN=0.3993458).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL5A1	NM_000093.5	c.4275C>G	p.Ile1425Met	missense_variant	55/66	ENST00000371817.8
COL5A1	NM_001278074.1	c.4275C>G	p.Ile1425Met	missense_variant	55/66
COL5A1	XM_017014266.3	c.4275C>G	p.Ile1425Met	missense_variant	55/65

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL5A1	ENST00000371817.8	c.4275C>G	p.Ile1425Met	missense_variant	55/66	1	NM_000093.5	P4
COL5A1	ENST00000371820.4	c.4275C>G	p.Ile1425Met	missense_variant	55/66	2		A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1458118 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 725230

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: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 18, 2022

This sequence change replaces isoleucine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 1425 of the COL5A1 protein (p.Ile1425Met). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with COL5A1-related conditions. ClinVar contains an entry for this variant (Variation ID: 529260). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt COL5A1 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.093
BayesDel_addAF	Benign	-0.0078	T
BayesDel_noAF	Benign	-0.25
CADD	Benign	0.38
DANN	Benign	0.95
DEOGEN2	Benign	0.16	T;.
Eigen	Benign	-0.79
Eigen_PC	Benign	-0.89
FATHMM_MKL	Benign	0.16	N
LIST_S2	Benign	0.84	T;T
M_CAP	Uncertain	0.16	D
MetaRNN	Benign	0.40	T;T
MetaSVM	Uncertain	0.061	D
MutationAssessor	Benign	0.25	N;N
MutationTaster	Benign	0.90	D
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-1.5	N;.
REVEL	Uncertain	0.38
Sift	Benign	0.082	T;.
Sift4G	Benign	0.077	T;T
Polyphen		0.97	D;.
Vest4		0.40
MutPred		0.21		Loss of catalytic residue at P1427 (P = 0.0368);Loss of catalytic residue at P1427 (P = 0.0368);
MVP		0.58
MPC		0.30
ClinPred		0.74	D
GERP RS		-4.9
Varity_R		0.077
gMVP		0.49

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: rs767372665; hg19: chr9-137710546;