rs762810181

chr9-134802963-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_000093.5(COL5A1):c.3082C>T(p.Leu1028Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000343 in 1,456,628 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. L1028L) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: COL5A1 NM_000093.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.31

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, COL5A1

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL5A1	NM_000093.5	c.3082C>T	p.Leu1028Phe	missense_variant	39/66	ENST00000371817.8
COL5A1	NM_001278074.1	c.3082C>T	p.Leu1028Phe	missense_variant	39/66
COL5A1	XM_017014266.3	c.3082C>T	p.Leu1028Phe	missense_variant	39/65

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL5A1	ENST00000371817.8	c.3082C>T	p.Leu1028Phe	missense_variant	39/66	1	NM_000093.5	P4
COL5A1	ENST00000371820.4	c.3082C>T	p.Leu1028Phe	missense_variant	39/66	2		A2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000847 AC: 2 AN: 236132 Hom.: 0 AF XY: 0.0000156 AC XY: 2 AN XY: 128108

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000495

Gnomad NFE exome AF: 0.00000946

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000343 AC: 5 AN: 1456628 Hom.: 0 Cov.: 32 AF XY: 0.00000414 AC XY: 3 AN XY: 723984

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: 0.0000382

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000826 AC: 1

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

Apr 06, 2017

Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, this variant is a rare missense change with an uncertain effect on protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. The frequency data for this variant (rs762810181) in the population databases is unreliable, as metrics indicate poor quality at this position in the ExAC database. This variant has not been reported in the literature in an individual with a COL5A1-related disease. This sequence change replaces leucine with phenylalanine at codon 1028 of the COL5A1 protein (p.Leu1028Phe). The leucine residue is highly conserved and there is a small physicochemical difference between leucine and phenylalanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.55
BayesDel_addAF	Uncertain	0.099	D
BayesDel_noAF	Benign	-0.10
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.61	D;.
Eigen	Uncertain	0.30
Eigen_PC	Benign	0.21
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.80	T;T
M_CAP	Uncertain	0.19	D
MetaRNN	Uncertain	0.70	D;D
MetaSVM	Uncertain	0.68	D
MutationAssessor	Benign	1.6	L;L
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.71	T
PROVEAN	Uncertain	-3.4	D;.
REVEL	Uncertain	0.60
Sift	Uncertain	0.023	D;.
Sift4G	Uncertain	0.026	D;D
Polyphen		1.0	D;.
Vest4		0.55
MutPred		0.48		Gain of glycosylation at P1023 (P = 0.3222);Gain of glycosylation at P1023 (P = 0.3222);
MVP		0.71
MPC		0.58
ClinPred		0.95	D
GERP RS		3.5
Varity_R		0.25
gMVP		0.080

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: rs762810181; hg19: chr9-137694809;