rs150687987

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_001852.4(COL9A2):c.1982C>T(p.Pro661Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00276 in 1,614,048 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. 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. P661R) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0023 ( 5 hom., cov: 32)

Exomes 𝑓: 0.0028 ( 1 hom. )

Consequence

COL9A2
NM_001852.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:8

Conservation

PhyloP100: 5.27

Publications

9 publications found

Variant links:

Genes affected

COL9A2 (HGNC:2218): (collagen type IX alpha 2 chain) This gene encodes one of the three alpha chains of type IX collagen, the major collagen component of hyaline cartilage. Type IX collagen, a heterotrimeric molecule, is usually found in tissues containing type II collagen, a fibrillar collagen. This chain is unusual in that, unlike the other two type IX alpha chains, it contains a covalently attached glycosaminoglycan side chain. Mutations in this gene are associated with multiple epiphyseal dysplasia. [provided by RefSeq, Jul 2008]

COL9A2 Gene-Disease associations (from GenCC):

epiphyseal dysplasia, multiple, 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
Stickler syndrome, type 5
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp, G2P
multiple epiphyseal dysplasia due to collagen 9 anomaly
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
autosomal recessive Stickler syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Stickler syndrome
Inheritance: AR Classification: LIMITED Submitted by: ClinGen

COL9A2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.017576963).

BP6

Variant 1-40301270-G-A is Benign according to our data. Variant chr1-40301270-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 196778.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00231 (352/152320) while in subpopulation NFE AF = 0.00347 (236/68028). AF 95% confidence interval is 0.00311. There are 5 homozygotes in GnomAd4. There are 165 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 5 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001852.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL9A2	NM_001852.4	MANE Select	c.1982C>T	p.Pro661Leu	missense	Exon 32 of 32	NP_001843.1	Q14055

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
COL9A2	ENST00000372748.8	TSL:1 MANE Select	c.1982C>T	p.Pro661Leu	missense	Exon 32 of 32	ENSP00000361834.3	Q14055
COL9A2	ENST00000482722.5	TSL:1	n.2285C>T		non_coding_transcript_exon	Exon 31 of 31
COL9A2	ENST00000869268.1		c.2066C>T	p.Pro689Leu	missense	Exon 32 of 32	ENSP00000539327.1

Frequencies

GnomAD3 genomes

AF:

0.00231

AC:

352

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000796

Gnomad AMI

AF:

0.0639

Gnomad AMR

AF:

0.000523

Gnomad ASJ

AF:

0.00346

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.0000941

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00347

Gnomad OTH

AF:

0.00144

GnomAD2 exomes

AF:

0.00206

AC:

511

AN:

248346

AF XY:

0.00214

show subpopulations

Gnomad AFR exome

AF:

0.000955

Gnomad AMR exome

AF:

0.000724

Gnomad ASJ exome

AF:

0.00309

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000464

Gnomad NFE exome

AF:

0.00362

Gnomad OTH exome

AF:

0.00165

GnomAD4 exome

AF:

0.00281

AC:

4105

AN:

1461728

Hom.:

Cov.:

AF XY:

0.00282

AC XY:

2052

AN XY:

727170

show subpopulations

African (AFR)

AF:

0.000418

AC:

AN:

33478

American (AMR)

AF:

0.000604

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00302

AC:

AN:

26120

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.000522

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.000412

AC:

AN:

53380

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00339

AC:

3775

AN:

1111944

Other (OTH)

AF:

0.00234

AC:

141

AN:

60382

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.472

Heterozygous variant carriers

234

468

703

937

1171

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

140

280

420

560

700

<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

AF:

0.00231

AC:

352

AN:

152320

Hom.:

Cov.:

AF XY:

0.00222

AC XY:

165

AN XY:

74482

show subpopulations

African (AFR)

AF:

0.000793

AC:

AN:

41588

American (AMR)

AF:

0.000523

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00346

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5168

South Asian (SAS)

AF:

0.000207

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.0000941

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00347

AC:

236

AN:

68028

Other (OTH)

AF:

0.00142

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

102

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.00291

Hom.:

Bravo

AF:

0.00254

TwinsUK

AF:

0.00324

AC:

ALSPAC

AF:

0.00363

AC:

ESP6500AA

AF:

0.000908

AC:

ESP6500EA

AF:

0.00465

AC:

ExAC

AF:

0.00239

AC:

290

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00333

EpiControl

AF:

0.00391

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (4)

not specified (3)

Connective tissue disorder (1)

Epiphyseal dysplasia, multiple, 2 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.079

BayesDel_noAF

Uncertain

0.12

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.60

Eigen

Pathogenic

0.84

Eigen_PC

Pathogenic

0.78

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.91

M_CAP

Pathogenic

0.57

MetaRNN

Benign

0.018

MetaSVM

Pathogenic

1.0

MutationAssessor

Pathogenic

3.1

PhyloP100

5.3

PrimateAI

Uncertain

0.74

PROVEAN

Uncertain

-4.4

REVEL

Pathogenic

0.73

Sift

Uncertain

0.0030

Sift4G

Uncertain

0.0030

Polyphen

1.0

Vest4

0.34

MVP

0.95

MPC

0.94

ClinPred

0.052

GERP RS

5.6

Varity_R

0.31

gMVP

0.50

Mutation Taster

=79/21

polymorphism

(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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over