rs557361751

Positions:

• chr9-134750857-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP2 BS2

The NM_000093.5(COL5A1):​c.1637C>T​(p.Ala546Val) variant causes a missense change. The variant allele was found at a frequency of 0.000109 in 1,612,838 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. A546A) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00023 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000097 (0 hom.)
• Consequence: COL5A1 NM_000093.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:1 O:2
• Conservation: PhyloP100: 5.46

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 Likely_benign. Variant got -3 ACMG points.

• PP2: Missense variant where missense usually causes diseases, COL5A1
• BS2: High AC in GnomAd4 at 35 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL5A1	NM_000093.5	c.1637C>T	p.Ala546Val	missense_variant	13/66	ENST00000371817.8
COL5A1	NM_001278074.1	c.1637C>T	p.Ala546Val	missense_variant	13/66
COL5A1	XM_017014266.3	c.1637C>T	p.Ala546Val	missense_variant	13/65

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL5A1	ENST00000371817.8	c.1637C>T	p.Ala546Val	missense_variant	13/66	1	NM_000093.5	P4
COL5A1	ENST00000371820.4	c.1637C>T	p.Ala546Val	missense_variant	13/66	2		A2

Frequencies

GnomAD3 genomes AF: 0.000230 AC: 35 AN: 152158 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00157

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.000283

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000125 AC: 31 AN: 248380 Hom.: 0 AF XY: 0.000133 AC XY: 18 AN XY: 135064

Gnomad AFR exome AF: 0.0000634

Gnomad AMR exome AF: 0.000406

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000546

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.000234

Gnomad NFE exome AF: 0.0000715

Gnomad OTH exome AF: 0.000332

GnomAD4 exome AF: 0.0000965 AC: 141 AN: 1460562 Hom.: 0 Cov.: 33 AF XY: 0.000102 AC XY: 74 AN XY: 726614

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.000313

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.000306

Gnomad4 NFE exome AF: 0.0000845

Gnomad4 OTH exome AF: 0.000182

GnomAD4 genome AF: 0.000230 AC: 35 AN: 152276 Hom.: 0 Cov.: 32 AF XY: 0.000296 AC XY: 22 AN XY: 74442

Gnomad4 AFR AF: 0.0000481

Gnomad4 AMR AF: 0.00157

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.000283

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000132 Hom.: 0

Bravo AF: 0.000200

ExAC AF: 0.0000330 AC: 4

EpiCase AF: 0.000109

EpiControl AF: 0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:1 Other:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Feb 01, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jun 29, 2023	Has not been previously published as pathogenic or benign to our knowledge; Not located in the triple helical region, where the majority of pathogenic missense variants occur (Symoens et al., 2012; HGMD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 32906206) -

Ehlers-Danlos syndrome, classic type, 1 Benign:1 Other:1

not provided, no classification provided	phenotyping only	GenomeConnect - Invitae Patient Insights Network	-	Variant interpreted as Likely benign and reported on 02-07-2020 by Invitae. GenomeConnect-Invitae Patient Insights Network assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. Registry team members make no attempt to reinterpret the clinical significance of the variant. Phenotypic details are available under supporting information. -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 16, 2024	- -

COL5A1-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Jul 07, 2023

The COL5A1 c.1637C>T variant is predicted to result in the amino acid substitution p.Ala546Val. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.040% of alleles in individuals of Latino descent in gnomAD (http://gnomad.broadinstitute.org/variant/9-137642703-C-T). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Familial thoracic aortic aneurysm and aortic dissection Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 20, 2016

The p.A546V variant (also known as c.1637C>T), located in coding exon 13 of the COL5A1 gene, results from a C to T substitution at nucleotide position 1637. The alanine at codon 546 is replaced by valine, an amino acid with similar properties. Based on data from ExAC, the T allele has an overall frequency of approximately 0.003% (4/115096). The highest observed frequency was 0.03% (2/5792) of European (Finnish) alleles (Exome Aggregation Consortium (ExAC), Cambridge, MA (URL: http://exac.broadinstitute.org) [Accessed January 20, 2016]). This variant was not reported in population based cohorts in the following databases: Database of Single Nucleotide Polymorphisms (dbSNP), NHLBI Exome Sequencing Project (ESP), and 1000 Genomes Project. In the ESP, this variant was not observed in 6503 samples (13006 alleles) with coverage at this position. This amino acid position is highly 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 variant remains unclear. -

Ehlers-Danlos syndrome type 7A Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Ehlers-Danlos syndrome, classic type Other:1

not provided, no classification provided

phenotyping only

GenomeConnect, ClinGen

-

Variant interpretted as Uncertain significance and reported on 08-03-2018 by Lab or GTR ID 500031. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.47
BayesDel_addAF	Benign	-0.063	T
BayesDel_noAF	Uncertain	-0.010
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.60	D;.
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.97	D;D
M_CAP	Uncertain	0.26	D
MetaRNN	Uncertain	0.59	D;D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Pathogenic	3.1	M;M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.72	T
PROVEAN	Uncertain	-3.5	D;.
REVEL	Uncertain	0.59
Sift	Benign	0.058	T;.
Sift4G	Uncertain	0.028	D;D
Polyphen		1.0	D;.
Vest4		0.76
MutPred		0.40		Gain of MoRF binding (P = 0.0862);Gain of MoRF binding (P = 0.0862);
MVP		0.83
MPC		1.5
ClinPred		0.60	D
GERP RS		4.7
Varity_R		0.19
gMVP		0.69

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs557361751; hg19: chr9-137642703; COSMIC: COSV65677369;