1-40304388-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001852.4(COL9A2):c.1219C>A(p.Pro407Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000116 in 1,599,562 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

COL9A2
NM_001852.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 1.54

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.1652604).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL9A2	NM_001852.4 linkuse as main transcript	c.1219C>A	p.Pro407Thr	missense_variant	24/32	ENST00000372748.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
COL9A2	ENST00000372748.8 linkuse as main transcript	c.1219C>A	p.Pro407Thr	missense_variant	24/32	1	NM_001852.4	P1
COL9A2	ENST00000482722.5 linkuse as main transcript	n.1522C>A		non_coding_transcript_exon_variant	23/31	1
COL9A2	ENST00000427563.1 linkuse as main transcript	n.30C>A		non_coding_transcript_exon_variant	2/7	3
COL9A2	ENST00000466267.1 linkuse as main transcript	n.184C>A		non_coding_transcript_exon_variant	4/11	5

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152146

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.000118

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000495

AC:

AN:

222354

Hom.:

AF XY:

0.0000417

AC XY:

AN XY:

119924

show subpopulations

Gnomad AFR exome

AF:

0.0000737

Gnomad AMR exome

AF:

0.0000319

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000915

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000121

AC:

175

AN:

1447298

Hom.:

Cov.:

AF XY:

0.000113

AC XY:

AN XY:

718476

show subpopulations

Gnomad4 AFR exome

AF:

0.0000601

Gnomad4 AMR exome

AF:

0.0000476

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000152

Gnomad4 OTH exome

AF:

0.0000501

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152264

Hom.:

Cov.:

AF XY:

0.0000537

AC XY:

AN XY:

74456

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000900

Hom.:

Bravo

AF:

0.0000567

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.0000743

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Aug 21, 2023	Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports that this missense variant does not alter protein structure/function -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Dec 22, 2016	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Jan 09, 2024	This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 407 of the COL9A2 protein (p.Pro407Thr). This variant is present in population databases (rs565855414, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with COL9A2-related conditions. ClinVar contains an entry for this variant (Variation ID: 283517). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt COL9A2 protein function with a negative predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.079

BayesDel_addAF

Benign

-0.017

BayesDel_noAF

Uncertain

-0.060

Cadd

Benign

Dann

Benign

0.94

DEOGEN2

Benign

0.23

Eigen

Benign

-0.091

Eigen_PC

Benign

0.028

FATHMM_MKL

Benign

0.73

LIST_S2

Benign

0.85

M_CAP

Benign

0.033

MetaRNN

Benign

0.17

MetaSVM

Uncertain

0.37

MutationAssessor

Uncertain

2.5

MutationTaster

Benign

0.67

PrimateAI

Benign

0.39

PROVEAN

Benign

-0.91

REVEL

Uncertain

0.33

Sift

Benign

0.13

Sift4G

Benign

0.32

Polyphen

0.036

Vest4

0.26

MutPred

0.37

Gain of phosphorylation at P407 (P = 0.0058);

MVP

0.86

MPC

0.88

ClinPred

0.061

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.098

gMVP

0.29

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over