NM_005202.4:c.2073C>G

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_005202.4(COL8A2):c.2073C>G(p.Ile691Met) variant causes a missense change. The variant allele was found at a frequency of 0.0000031 in 1,612,716 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

COL8A2
NM_005202.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.60

Publications

0 publications found

Variant links:

Genes affected

COL8A2 (HGNC:2216): (collagen type VIII alpha 2 chain) This gene encodes the alpha 2 chain of type VIII collagen. This protein is a major component of the basement membrane of the corneal endothelium and forms homo- or heterotrimers with alpha 1 (VIII) type collagens. Defects in this gene are associated with Fuchs endothelial corneal dystrophy and posterior polymorphous corneal dystrophy type 2. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2014]

COL8A2 Gene-Disease associations (from GenCC):

corneal dystrophy, Fuchs endothelial, 1
Inheritance: AD Classification: STRONG Submitted by: G2P
posterior polymorphous corneal dystrophy 2
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
Fuchs' endothelial dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
posterior polymorphous corneal dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

COL8A2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL8A2	NM_005202.4 link	c.2073C>G	p.Ile691Met	missense_variant	Exon 4 of 4	ENST00000397799.2	NP_005193.1	P25067
COL8A2	NM_001294347.2 link	c.1878C>G	p.Ile626Met	missense_variant	Exon 4 of 4		NP_001281276.1	P25067E9PP49

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL8A2	ENST00000397799.2 link	c.2073C>G	p.Ile691Met	missense_variant	Exon 4 of 4	5	NM_005202.4	ENSP00000380901.1	P25067
COL8A2	ENST00000481785.1 link	c.1878C>G	p.Ile626Met	missense_variant	Exon 2 of 2	1		ENSP00000436433.1	E9PP49
COL8A2	ENST00000303143.9 link	c.2073C>G	p.Ile691Met	missense_variant	Exon 2 of 2	2		ENSP00000305913.4	P25067

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000798

AC:

AN:

250658

AF XY:

0.0000147

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000579

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1460386

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

726434

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33414

American (AMR)

AF:

0.0000896

AC:

AN:

44660

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26120

East Asian (EAS)

AF:

0.00

AC:

AN:

39688

South Asian (SAS)

AF:

0.00

AC:

AN:

86234

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52742

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5652

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111536

Other (OTH)

AF:

0.00

AC:

AN:

60340

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00000656

AC:

AN:

152330

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74488

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41568

American (AMR)

AF:

0.0000653

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10632

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68016

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.625

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Aug 20, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.2073C>G (p.I691M) alteration is located in exon 2 (coding exon 2) of the COL8A2 gene. This alteration results from a C to G substitution at nucleotide position 2073, causing the isoleucine (I) at amino acid position 691 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.75

BayesDel_addAF

Uncertain

0.032

BayesDel_noAF

Uncertain

-0.020

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.20

T;T;.

Eigen

Uncertain

0.52

Eigen_PC

Uncertain

0.57

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.83

.;T;T

M_CAP

Benign

0.040

MetaRNN

Uncertain

0.49

T;T;T

MetaSVM

Uncertain

-0.25

MutationAssessor

Benign

0.86

L;L;.

PhyloP100

5.6

PrimateAI

Pathogenic

0.83

PROVEAN

Benign

-1.1

N;N;N

REVEL

Uncertain

0.43

Sift

Uncertain

0.017

D;D;T

Sift4G

Benign

0.10

T;T;T

Polyphen

0.87

P;P;.

Vest4

0.72

MutPred

0.47

Gain of disorder (P = 0.04);Gain of disorder (P = 0.04);.;

MVP

0.74

MPC

0.99

ClinPred

0.55

GERP RS

5.0

Varity_R

0.45

gMVP

0.59

Mutation Taster

=22/78

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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NM_005202.4:c.2073C>G

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