NM_001852.4:c.1323+18T>G

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_001852.4(COL9A2):c.1323+18T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000589 in 1,578,890 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 Likely benign (★★).

Frequency

Genomes: 𝑓 0.0034 ( 3 hom., cov: 32)

Exomes 𝑓: 0.00029 ( 3 hom. )

Consequence

COL9A2
NM_001852.4 intron

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: -0.575

Publications

0 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: G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
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 -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.9).

BP6

Variant 1-40304046-A-C is Benign according to our data. Variant chr1-40304046-A-C is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 258371.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0034 (518/152166) while in subpopulation AFR AF = 0.0119 (496/41522). AF 95% confidence interval is 0.0111. There are 3 homozygotes in GnomAd4. There are 244 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 3 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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL9A2	NM_001852.4	MANE Select	c.1323+18T>G		intron	N/A	NP_001843.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
COL9A2	ENST00000372748.8	TSL:1 MANE Select	c.1323+18T>G	intron	N/A	ENSP00000361834.3
COL9A2	ENST00000482722.5	TSL:1	n.1626+18T>G	intron	N/A
COL9A2	ENST00000427563.1	TSL:3	n.134+18T>G	intron	N/A

Frequencies

GnomAD3 genomes

AF:

0.00340

AC:

517

AN:

152048

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0120

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00105

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:

0.0000294

Gnomad OTH

AF:

0.00191

GnomAD2 exomes

AF:

0.000677

AC:

129

AN:

190470

AF XY:

0.000479

show subpopulations

Gnomad AFR exome

AF:

0.00975

Gnomad AMR exome

AF:

0.000542

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000245

Gnomad OTH exome

AF:

0.000204

GnomAD4 exome

AF:

0.000289

AC:

412

AN:

1426724

Hom.:

Cov.:

AF XY:

0.000277

AC XY:

196

AN XY:

706308

show subpopulations

African (AFR)

AF:

0.00995

AC:

329

AN:

33062

American (AMR)

AF:

0.000854

AC:

AN:

38658

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25386

East Asian (EAS)

AF:

0.00

AC:

AN:

38322

South Asian (SAS)

AF:

0.0000123

AC:

AN:

81484

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49914

Middle Eastern (MID)

AF:

0.000528

AC:

AN:

5678

European-Non Finnish (NFE)

AF:

0.00000639

AC:

AN:

1095152

Other (OTH)

AF:

0.000660

AC:

AN:

59068

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

Heterozygous variant carriers

101

126

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<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:

0.00340

AC:

518

AN:

152166

Hom.:

Cov.:

AF XY:

0.00328

AC XY:

244

AN XY:

74408

show subpopulations

African (AFR)

AF:

0.0119

AC:

496

AN:

41522

American (AMR)

AF:

0.00105

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5164

South Asian (SAS)

AF:

0.00

AC:

AN:

4814

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

67972

Other (OTH)

AF:

0.00189

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.506

Heterozygous variant carriers

111

139

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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:

0.000428

Hom.:

Bravo

AF:

0.00362

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jan 23, 2019

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not specified

Benign:1

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Epiphyseal dysplasia, multiple, 2;C3280342:Stickler syndrome, type 5

Benign:1

Oct 13, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.90

CADD

Benign

0.63

(source)

DANN

Benign

0.32

PhyloP100

-0.57

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

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

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over