9-134782718-C-G

Variant names:

• chr9-134782718-C-G
• rs185912761
• NM_000093.5:c.2482C>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_000093.5(COL5A1):​c.2482C>G​(p.Arg828Gly) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000712 in 1,405,066 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. 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. R828W) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: COL5A1 NM_000093.5 missense, splice_region
• Scores: Splicing: ADA: 0.4410
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.51
• Publications: 2 publications found

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]

COL5A1 Gene-Disease associations (from GenCC):

• Ehlers-Danlos syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• Ehlers-Danlos syndrome, classic type

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Orphanet, Ambry Genetics, PanelApp Australia, Genomics England PanelApp
• Ehlers-Danlos syndrome, classic type, 1

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• arterial disorder

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.813

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000093.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL5A1	NM_000093.5	MANE Select	c.2482C>G	p.Arg828Gly	missense splice_region	Exon 29 of 66	NP_000084.3
	COL5A1	NM_001278074.1		c.2482C>G	p.Arg828Gly	missense splice_region	Exon 29 of 66	NP_001265003.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL5A1	ENST00000371817.8	TSL:1 MANE Select	c.2482C>G	p.Arg828Gly	missense splice_region	Exon 29 of 66	ENSP00000360882.3
	COL5A1	ENST00000371820.4	TSL:2	c.2482C>G	p.Arg828Gly	missense splice_region	Exon 29 of 66	ENSP00000360885.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.12e-7 AC: 1 AN: 1405066 Hom.: 0 Cov.: 33 AF XY: 0.00000143 AC XY: 1 AN XY: 699202

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 31806

American (AMR) AF: 0.00 AC: 0 AN: 42960

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23914

East Asian (EAS) AF: 0.00 AC: 0 AN: 35046

South Asian (SAS) AF: 0.00 AC: 0 AN: 85696

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46668

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5488

European-Non Finnish (NFE) AF: 9.28e-7 AC: 1 AN: 1077052

Other (OTH) AF: 0.00 AC: 0 AN: 56436

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Familial thoracic aortic aneurysm and aortic dissection (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.73	D
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.63	D
MetaRNN	Pathogenic	0.81	D
MetaSVM	Pathogenic	0.91	D
MutationAssessor	Uncertain	2.4	M
PhyloP100		1.5
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-5.0	D
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0080	D
Sift4G	Benign	0.073	T
Polyphen		1.0	D
Vest4		0.63
MutPred		0.45		Loss of methylation at R828 (P = 0.0196)
MVP		0.87
MPC		0.69
ClinPred		0.99	D
GERP RS		3.1
Varity_R		0.51
gMVP		0.72
Mutation Taster		=59/41	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.44
dbscSNV1_RF	Benign	0.44
SpliceAI score (max)		0.24		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.24		Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs185912761; hg19: chr9-137674564;