rs770173348

Positions:

• chr9-134728805-G-A
• chr9-134728805-G-C

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 1P and 6B. PP2 BP4_Moderate BS2

The NM_000093.5(COL5A1):​c.922G>A​(p.Glu308Lys) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000103 in 1,461,768 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000010 (0 hom.)
• Consequence: COL5A1 NM_000093.5 missense, splice_region
• Scores: Splicing: ADA: 0.00002072
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.50

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 -5 ACMG points.

• 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=0.25193596).
• BS2: High AC in GnomAdExome4 at 15 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL5A1	NM_000093.5	c.922G>A	p.Glu308Lys	missense_variant, splice_region_variant	6/66	ENST00000371817.8	NP_000084.3
COL5A1	NM_001278074.1	c.922G>A	p.Glu308Lys	missense_variant, splice_region_variant	6/66		NP_001265003.1
COL5A1	XM_017014266.3	c.922G>A	p.Glu308Lys	missense_variant, splice_region_variant	6/65		XP_016869755.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL5A1	ENST00000371817.8	c.922G>A	p.Glu308Lys	missense_variant, splice_region_variant	6/66	1	NM_000093.5	ENSP00000360882.3
COL5A1	ENST00000371820.4	c.922G>A	p.Glu308Lys	missense_variant, splice_region_variant	6/66	2		ENSP00000360885.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000400 AC: 1 AN: 250060 Hom.: 0 AF XY: 0.00000739 AC XY: 1 AN XY: 135278

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: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000103 AC: 15 AN: 1461768 Hom.: 0 Cov.: 34 AF XY: 0.0000151 AC XY: 11 AN XY: 727182

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000809

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000151

ExAC AF: 0.00000824 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

Labcorp Genetics (formerly Invitae), Labcorp

Jan 16, 2023

ClinVar contains an entry for this variant (Variation ID: 409112). 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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The lysine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant has not been reported in the literature in individuals affected with COL5A1-related conditions. This variant is present in population databases (rs770173348, gnomAD 0.003%). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 308 of the COL5A1 protein (p.Glu308Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.063
BayesDel_addAF	Benign	-0.012	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	16
DANN	Benign	0.94
DEOGEN2	Benign	0.086	T;.
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.45
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.76	T;T
M_CAP	Uncertain	0.28	D
MetaRNN	Benign	0.25	T;T
MetaSVM	Benign	-0.51	T
MutationAssessor	Uncertain	2.2	M;M
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	-0.62	N;.
REVEL	Uncertain	0.33
Sift	Benign	0.24	T;.
Sift4G	Benign	0.42	T;T
Polyphen		0.84	P;.
Vest4		0.40
MutPred		0.32		Gain of ubiquitination at E308 (P = 0.0022);Gain of ubiquitination at E308 (P = 0.0022);
MVP		0.62
MPC		0.22
ClinPred		0.20	T
GERP RS		3.4
Varity_R		0.055
gMVP		0.27

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000021
dbscSNV1_RF	Benign	0.0080
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: rs770173348; hg19: chr9-137620651; COSMIC: COSV65672484; COSMIC: COSV65672484;