Genetic Variant COL5A1:c.4955-16C>A (chr9-134825776-C-A) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_000093.5(COL5A1):c.4955-16C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000706 in 1,415,510 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 7.1e-7 ( 0 hom. )

Consequence

COL5A1
NM_000093.5 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.456

Publications

0 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:

LOC101448202 (HGNC:):

LOC101448202 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein	UniProt
COL5A1	NM_000093.5 link	c.4955-16C>A	intron_variant	Intron 62 of 65	ENST00000371817.8	NP_000084.3	P20908-1A0A024R8E5B2ZZ86Q59EE7
COL5A1	NM_001278074.1 link	c.4955-16C>A	intron_variant	Intron 62 of 65		NP_001265003.1	B2ZZ86Q59EE7
LOC101448202	NR_103451.2 link	n.71-5567G>T	intron_variant	Intron 1 of 1
COL5A1	XM_017014266.3 link	c.4955-16C>A	intron_variant	Intron 62 of 64		XP_016869755.1

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL5A1	ENST00000371817.8 link	c.4955-16C>A	intron_variant	Intron 62 of 65	1	NM_000093.5	ENSP00000360882.3	P20908-1
COL5A1	ENST00000371820.4 link	c.4955-16C>A	intron_variant	Intron 62 of 65	2		ENSP00000360885.4	P20908-2H7BY82
COL5A1	ENST00000460264.5 link	n.423-16C>A	intron_variant	Intron 3 of 4	3
COL5A1	ENST00000465877.1 link	n.135-16C>A	intron_variant	Intron 1 of 3	3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.06e-7

AC:

AN:

1415510

Hom.:

Cov.:

AF XY:

0.00000141

AC XY:

AN XY:

706814

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

32538

American (AMR)

AF:

0.00

AC:

AN:

44498

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25758

East Asian (EAS)

AF:

0.00

AC:

AN:

39322

South Asian (SAS)

AF:

0.0000118

AC:

AN:

85026

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52986

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5686

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1070988

Other (OTH)

AF:

0.00

AC:

AN:

58708

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.66

CADD

Benign

1.3

(source)

DANN

Benign

0.89

PhyloP100

-0.46

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.85

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.66

Position offset: 2

DS_AL_spliceai

0.85

Position offset: 16

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over