Genetic Variant NM_001853.4:c.5C>T (chr20-62817069-C-T) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_001853.4(COL9A3):c.5C>T(p.Ala2Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000581 in 1,377,954 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000024 ( 0 hom. )

Consequence

COL9A3
NM_001853.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.436

Variant links:

Genes affected

COL9A3 (HGNC:2219): (collagen type IX alpha 3 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. Mutations in this gene are associated with multiple epiphyseal dysplasia type 3. [provided by RefSeq, Jan 2010]

COL9A3 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.29130483).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL9A3	NM_001853.4 link	c.5C>T	p.Ala2Val	missense_variant	Exon 1 of 32	ENST00000649368.1	NP_001844.3	Q14050

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL9A3	ENST00000649368.1 link	c.5C>T	p.Ala2Val	missense_variant	Exon 1 of 32		NM_001853.4	ENSP00000496793.1		Q14050
COL9A3	ENST00000477612.5 link	n.75-498C>T		intron_variant	Intron 1 of 11	3

Frequencies

GnomAD3 genomes

AF:

0.0000331

AC:

AN:

151248

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000245

AC:

AN:

1226706

Hom.:

Cov.:

AF XY:

0.00000165

AC XY:

AN XY:

604416

show subpopulations

Gnomad4 AFR exome

AF:

0.0000817

Gnomad4 AMR exome

AF:

0.00

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:

0.00

Gnomad4 OTH exome

AF:

0.0000206

GnomAD4 genome

AF:

0.0000331

AC:

AN:

151248

Hom.:

Cov.:

AF XY:

0.0000406

AC XY:

AN XY:

73834

show subpopulations

Gnomad4 AFR

AF:

0.000121

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Aug 12, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.26

BayesDel_addAF

Uncertain

0.035

BayesDel_noAF

Benign

-0.19

CADD

Benign

DANN

Benign

0.93

DEOGEN2

Benign

0.0022

T;T

Eigen

Benign

-0.76

Eigen_PC

Benign

-0.70

FATHMM_MKL

Benign

0.20

LIST_S2

Benign

0.25

.;T

M_CAP

Pathogenic

0.76

MetaRNN

Benign

0.29

T;T

MetaSVM

Benign

-0.44

MutationAssessor

Benign

0.90

L;L

PrimateAI

Pathogenic

0.80

PROVEAN

Benign

-0.77

.;N

REVEL

Uncertain

0.30

Sift

Pathogenic

0.0

.;D

Sift4G

Uncertain

0.018

.;D

Polyphen

0.0060

B;B

Vest4

0.14

MutPred

0.29

Loss of disorder (P = 0.0514);Loss of disorder (P = 0.0514);

MVP

0.70

MPC

0.070

ClinPred

0.36

GERP RS

2.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.24

gMVP

0.29

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

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