chr9-134642188-A-G

Position:

• chr9-134642188-A-G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1 PS1_Moderate PM2 PP5_Moderate

The NM_000093.5(COL5A1):​c.1A>G​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: COL5A1 NM_000093.5 start_lost
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.37

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 Pathogenic. Variant got 14 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PS1: Another start lost variant in NM_000093.5 (COL5A1) was described as [Pathogenic] in ClinVar as 2750255
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 9-134642188-A-G is Pathogenic according to our data. Variant chr9-134642188-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 1381199.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL5A1	NM_000093.5	c.1A>G	p.Met1?	start_lost	1/66	ENST00000371817.8
COL5A1	NM_001278074.1	c.1A>G	p.Met1?	start_lost	1/66
COL5A1	XM_017014266.3	c.1A>G	p.Met1?	start_lost	1/65

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL5A1	ENST00000371817.8	c.1A>G	p.Met1?	start_lost	1/66	1	NM_000093.5	P4
COL5A1	ENST00000371820.4	c.1A>G	p.Met1?	start_lost	1/66	2		A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1121896 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 541154

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: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Oct 14, 2021

For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the COL5A1 protein in which other variant(s) (p.Leu25Arg) have been determined to be pathogenic (PMID: 18972565; Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant has not been reported in the literature in individuals affected with COL5A1-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This sequence change affects the initiator methionine of the COL5A1 mRNA. The next in-frame methionine is located at codon 198. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Benign	23
DANN	Uncertain	0.98
DEOGEN2	Benign	0.093	T;.
Eigen	Benign	-0.25
Eigen_PC	Benign	-0.17
FATHMM_MKL	Benign	0.66	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	1.0	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Benign	-0.35	T
MutationTaster	Benign	1.0	D
PROVEAN	Benign	-1.1	N;.
REVEL	Uncertain	0.54
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.0060	B;.
Vest4		0.70
MutPred		0.97		Loss of catalytic residue at M1 (P = 0.0071);Loss of catalytic residue at M1 (P = 0.0071);
MVP		0.98
ClinPred		0.98	D
GERP RS		2.7
Varity_R		0.82
gMVP		0.40

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr9-137534034;