NM_001851.6:c.2271G>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BA1

The NM_001851.6(COL9A1):c.2271G>A(p.Pro757Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0185 in 1,614,076 control chromosomes in the GnomAD database, including 804 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★). Synonymous variant affecting the same amino acid position (i.e. P757P) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.015 ( 78 hom., cov: 32)

Exomes 𝑓: 0.019 ( 726 hom. )

Consequence

COL9A1
NM_001851.6 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -1.39

Publications

15 publications found

Variant links:

Genes affected

COL9A1 (HGNC:2217): (collagen type IX alpha 1 chain) This gene encodes one of the three alpha chains of type IX collagen, which is a minor (5-20%) collagen component of hyaline cartilage. Type IX collagen is usually found in tissues containing type II collagen, a fibrillar collagen. Studies in knockout mice have shown that synthesis of the alpha 1 chain is essential for assembly of type IX collagen molecules, a heterotrimeric molecule, and that lack of type IX collagen is associated with early onset osteoarthritis. Mutations in this gene are associated with osteoarthritis in humans, with multiple epiphyseal dysplasia, 6, a form of chondrodysplasia, and with Stickler syndrome, a disease characterized by ophthalmic, orofacial, articular, and auditory defects. Two transcript variants that encode different isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

COL9A1 Gene-Disease associations (from GenCC):

epiphyseal dysplasia, multiple, 6
Inheritance: AD, AR, Unknown Classification: DEFINITIVE, LIMITED Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
Stickler syndrome, type 4
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Genomics England PanelApp, PanelApp Australia, Labcorp Genetics (formerly Invitae)
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

COL9A1 links:

ENSG00000253809 (HGNC:):

ENSG00000253809 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.51).

BP6

Variant 6-70234582-C-T is Benign according to our data. Variant chr6-70234582-C-T is described in ClinVar as Benign. ClinVar VariationId is 166949.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-1.39 with no splicing effect.

BA1

GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.124 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL9A1	NM_001851.6 link	c.2271G>A	p.Pro757Pro	synonymous_variant	Exon 35 of 38	ENST00000357250.11	NP_001842.3	P20849-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL9A1	ENST00000357250.11 link	c.2271G>A	p.Pro757Pro	synonymous_variant	Exon 35 of 38	1	NM_001851.6	ENSP00000349790.6		P20849-1

Frequencies

GnomAD3 genomes

AF:

0.0150

AC:

2280

AN:

152156

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00550

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0105

Gnomad ASJ

AF:

0.00606

Gnomad EAS

AF:

0.133

Gnomad SAS

AF:

0.0613

Gnomad FIN

AF:

0.00207

Gnomad MID

AF:

0.0222

Gnomad NFE

AF:

0.0121

Gnomad OTH

AF:

0.0139

GnomAD2 exomes

AF:

0.0253

AC:

6371

AN:

251370

AF XY:

0.0275

show subpopulations

Gnomad AFR exome

AF:

0.00511

Gnomad AMR exome

AF:

0.00853

Gnomad ASJ exome

AF:

0.00556

Gnomad EAS exome

AF:

0.129

Gnomad FIN exome

AF:

0.00236

Gnomad NFE exome

AF:

0.0115

Gnomad OTH exome

AF:

0.0202

GnomAD4 exome

AF:

0.0188

AC:

27523

AN:

1461802

Hom.:

726

Cov.:

AF XY:

0.0202

AC XY:

14717

AN XY:

727194

show subpopulations

African (AFR)

AF:

0.00559

AC:

187

AN:

33480

American (AMR)

AF:

0.00841

AC:

376

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00597

AC:

156

AN:

26136

East Asian (EAS)

AF:

0.133

AC:

5295

AN:

39692

South Asian (SAS)

AF:

0.0665

AC:

5734

AN:

86248

European-Finnish (FIN)

AF:

0.00249

AC:

133

AN:

53416

Middle Eastern (MID)

AF:

0.0303

AC:

175

AN:

5768

European-Non Finnish (NFE)

AF:

0.0127

AC:

14127

AN:

1111946

Other (OTH)

AF:

0.0222

AC:

1340

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.466

Heterozygous variant carriers

1523

3045

4568

6090

7613

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

668

1336

2004

2672

3340

<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:

0.0150

AC:

2286

AN:

152274

Hom.:

Cov.:

AF XY:

0.0165

AC XY:

1229

AN XY:

74452

show subpopulations

African (AFR)

AF:

0.00551

AC:

229

AN:

41544

American (AMR)

AF:

0.0105

AC:

161

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00606

AC:

AN:

3468

East Asian (EAS)

AF:

0.132

AC:

684

AN:

5190

South Asian (SAS)

AF:

0.0620

AC:

299

AN:

4824

European-Finnish (FIN)

AF:

0.00207

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.0238

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0121

AC:

826

AN:

68024

Other (OTH)

AF:

0.0176

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

104

208

313

417

521

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

120

160

200

<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:

0.0122

Hom.:

Bravo

AF:

0.0144

Asia WGS

AF:

0.109

AC:

379

AN:

3478

EpiCase

AF:

0.0132

EpiControl

AF:

0.0129

ClinVar

Significance: Benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:3

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mar 19, 2014

Eurofins Ntd Llc (ga)

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Oct 11, 2016

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

not provided

Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Connective tissue disorder

Benign:1

May 12, 2022

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.51

CADD

Benign

1.1

(source)

DANN

Benign

0.50

PhyloP100

-1.4

Mutation Taster

=99/1

polymorphism (auto)

(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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over