chr9-134801984-C-G

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP6

The NM_000093.5(COL5A1):c.2983C>G(p.Pro995Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,150 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P995S) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

COL5A1
NM_000093.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:1

Conservation

PhyloP100: 7.74

Publications

2 publications found

Variant links:

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

COL5A1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP6

Variant 9-134801984-C-G is Benign according to our data. Variant chr9-134801984-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 373323.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
COL5A1	NM_000093.5 link	c.2983C>G	p.Pro995Ala	missense_variant	Exon 38 of 66	ENST00000371817.8	NP_000084.3
COL5A1	NM_001278074.1 link	c.2983C>G	p.Pro995Ala	missense_variant	Exon 38 of 66		NP_001265003.1
COL5A1	XM_017014266.3 link	c.2983C>G	p.Pro995Ala	missense_variant	Exon 38 of 65		XP_016869755.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL5A1	ENST00000371817.8 link	c.2983C>G	p.Pro995Ala	missense_variant	Exon 38 of 66	1	NM_000093.5	ENSP00000360882.3
COL5A1	ENST00000371820.4 link	c.2983C>G	p.Pro995Ala	missense_variant	Exon 38 of 66	2		ENSP00000360885.4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000120

AC:

AN:

250820

AF XY:

0.0000221

show subpopulations

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 FIN exome

AF:

0.0000463

Gnomad NFE exome

AF:

0.00000883

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461150

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

726884

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000380

AC:

AN:

52690

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112006

Other (OTH)

AF:

0.0000166

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 17, 2016

GeneDx

Significance:Uncertain significance

Review Status:flagged submission

Collection Method:clinical testing

The P995A variant in the COL5A1 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The P995A variant was not observed in approximately 6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. This substitution occurs at a position that is conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. The P995A variant is a semi-conservative amino acid substitution, which occurs at a non-Glycine residue within the collagen triple-helical region containing Gly-X-Y repeats. Substitutions of Glycine residues in these Gly-X-Y motifs within the triple helical regions of the COL5A1 protein represent the vast majority of pathogenic missense variants in the COL5A1 gene associated with Ehlers-Danlos syndrome (Stenson et al., 2014). We therefore interpret P995A as a variant of uncertain significance. -

not provided

Uncertain:1

Jan 29, 2020

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Has not been previously published as pathogenic or benign to our knowledge; Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 373323; Landrum et al., 2016); Not observed at a significant frequency in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Occurs in the triple helical domain at the X position in the canonical Gly-X-Y repeat; although this variant may have an effect on normal protein folding and function, missense substitution at the X position is not a common mechanism of disease (Symoens et al., 2012; Stenson et al., 2014) -

Ehlers-Danlos syndrome, classic type, 1

Benign:1

Jan 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.36

BayesDel_addAF

Benign

-0.13

BayesDel_noAF

Benign

-0.32

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.67

D;.

Eigen

Uncertain

0.52

Eigen_PC

Uncertain

0.50

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.93

D;D

M_CAP

Benign

0.015

MetaRNN

Uncertain

0.68

D;D

MetaSVM

Benign

-0.89

MutationAssessor

Benign

1.4

L;L

PhyloP100

7.7

PrimateAI

Uncertain

0.73

PROVEAN

Pathogenic

-6.7

D;.

REVEL

Uncertain

0.31

Sift

Benign

0.15

T;.

Sift4G

Benign

0.12

T;T

Polyphen

1.0

D;.

Vest4

0.59

MutPred

0.37

Loss of glycosylation at P995 (P = 0.0273);Loss of glycosylation at P995 (P = 0.0273);

MVP

0.51

MPC

0.52

ClinPred

0.75

GERP RS

4.7

Varity_R

0.31

gMVP

0.14

Mutation Taster

=32/68

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over