rs113549021

Variant names:

• chr1-40311262-T-C
• rs113549021
• NM_001852.4:c.544A>G

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001852.4(COL9A2):​c.544A>G​(p.Met182Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00143 in 1,614,144 control chromosomes in the GnomAD database, including 27 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0080 (13 hom., cov: 32)
  • Exomes 𝑓: 0.00075 (14 hom.)
• Consequence: COL9A2 NM_001852.4 missense
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:8
• Conservation: PhyloP100: 1.45
• Publications: 2 publications found

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

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.004476011).
• BP6: Variant 1-40311262-T-C is Benign according to our data. Variant chr1-40311262-T-C is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 258391.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 = 0.008 (1219/152304) while in subpopulation AFR AF = 0.0283 (1177/41556). AF 95% confidence interval is 0.027. There are 13 homozygotes in GnomAd4. There are 574 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 13 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.544A>G	p.Met182Val	missense	Exon 11 of 32	NP_001843.1	Q14055

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL9A2	ENST00000372748.8	TSL:1 MANE Select	c.544A>G	p.Met182Val	missense	Exon 11 of 32	ENSP00000361834.3	Q14055
	COL9A2	ENST00000482722.5	TSL:1	n.847A>G		non_coding_transcript_exon	Exon 10 of 31
	COL9A2	ENST00000869268.1		c.544A>G	p.Met182Val	missense	Exon 11 of 32	ENSP00000539327.1

Frequencies

GnomAD3 genomes AF: 0.00799 AC: 1216 AN: 152186 Hom.: 13 Cov.: 32

Gnomad AFR AF: 0.0283

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00196

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: 0.0000588

Gnomad OTH AF: 0.00383

GnomAD2 exomes AF: 0.00195 AC: 490 AN: 251220 AF XY: 0.00135

Gnomad AFR exome AF: 0.0277

Gnomad AMR exome AF: 0.000753

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000440

Gnomad OTH exome AF: 0.000653

GnomAD4 exome AF: 0.000746 AC: 1091 AN: 1461840 Hom.: 14 Cov.: 35 AF XY: 0.000637 AC XY: 463 AN XY: 727216

African (AFR) AF: 0.0275 AC: 920 AN: 33478

American (AMR) AF: 0.000984 AC: 44 AN: 44712

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.000116 AC: 10 AN: 86246

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.000867 AC: 5 AN: 5768

European-Non Finnish (NFE) AF: 0.0000117 AC: 13 AN: 1111992

Other (OTH) AF: 0.00164 AC: 99 AN: 60394

GnomAD4 genome AF: 0.00800 AC: 1219 AN: 152304 Hom.: 13 Cov.: 32 AF XY: 0.00771 AC XY: 574 AN XY: 74482

African (AFR) AF: 0.0283 AC: 1177 AN: 41556

American (AMR) AF: 0.00196 AC: 30 AN: 15308

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5182

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10628

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000588 AC: 4 AN: 68014

Other (OTH) AF: 0.00379 AC: 8 AN: 2112

Alfa AF: 0.00338 Hom.: 18

Bravo AF: 0.00874

ESP6500AA AF: 0.0234 AC: 103

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.00254 AC: 308

Asia WGS AF: 0.00115 AC: 4 AN: 3478

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	3	not specified (3)
-	-	2	not provided (2)
-	-	1	COL9A2-related disorder (1)
-	-	1	Connective tissue disorder (1)
-	-	1	Epiphyseal dysplasia, multiple, 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.060
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	6.7
DANN	Benign	0.68
DEOGEN2	Benign	0.089	T
Eigen	Benign	-0.41
Eigen_PC	Benign	-0.35
FATHMM_MKL	Benign	0.29	N
LIST_S2	Benign	0.67	T
MetaRNN	Benign	0.0045	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.030	N
PhyloP100		1.4
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.24	N
REVEL	Benign	0.18
Sift	Benign	1.0	T
Sift4G	Benign	1.0	T
Polyphen		0.0	B
Vest4		0.20
MVP		0.83
MPC		0.26
ClinPred		0.0021	T
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.033
gMVP		0.19
Mutation Taster		=99/1	polymorphism

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

Other links and lift over

dbSNP: rs113549021; hg19: chr1-40776934;