rs138498898

Positions:

chr12-47974258-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 3P and 5B. PM1PP2BP4BS2

The NM_001844.5(COL2A1):c.4148C>T(p.Thr1383Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000669 in 1,614,116 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. T1383T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000068 ( 0 hom. )

Consequence

COL2A1
NM_001844.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:3B:1

Conservation

PhyloP100: 0.876

Variant links:

Genes affected

COL2A1 (HGNC:2200): (collagen type II alpha 1 chain) This gene encodes the alpha-1 chain of type II collagen, a fibrillar collagen found in cartilage and the vitreous humor of the eye. Mutations in this gene are associated with achondrogenesis, chondrodysplasia, early onset familial osteoarthritis, SED congenita, Langer-Saldino achondrogenesis, Kniest dysplasia, Stickler syndrome type I, and spondyloepimetaphyseal dysplasia Strudwick type. In addition, defects in processing chondrocalcin, a calcium binding protein that is the C-propeptide of this collagen molecule, are also associated with chondrodysplasia. There are two transcripts identified for this gene. [provided by RefSeq, Jul 2008]

COL2A1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 3 benign, 4 uncertain in NM_001844.5

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), COL2A1. . Gene score misZ 3.2926 (greater than the threshold 3.09). Trascript score misZ 5.3726 (greater than threshold 3.09). GenCC has associacion of gene with spondylometaphyseal dysplasia, Schmidt type, spondyloepiphyseal dysplasia congenita, hypochondrogenesis, autosomal dominant rhegmatogenous retinal detachment, spondyloperipheral dysplasia, Kniest dysplasia, familial avascular necrosis of femoral head, spondylometaphyseal dysplasia, mild spondyloepiphyseal dysplasia due to COL2A1 mutation with early-onset osteoarthritis, otospondylomegaepiphyseal dysplasia, autosomal recessive, multiple epiphyseal dysplasia, Beighton type, otospondylomegaepiphyseal dysplasia, Legg-Calve-Perthes disease, achondrogenesis type II, spondyloepiphyseal dysplasia, Stanescu type, platyspondylic dysplasia, Torrance type, Stickler syndrome type 1, dysspondyloenchondromatosis, vitreoretinopathy with phalangeal epiphyseal dysplasia, Stickler syndrome, type I, nonsyndromic ocular, avascular necrosis of femoral head, primary, 1, spondyloepiphyseal dysplasia with metatarsal shortening, spondyloepimetaphyseal dysplasia, Strudwick type.

BP4

Computational evidence support a benign effect (MetaRNN=0.37494895).

BS2

High AC in GnomAd4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL2A1	NM_001844.5 linkuse as main transcript	c.4148C>T	p.Thr1383Met	missense_variant	53/54	ENST00000380518.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL2A1	ENST00000380518.8 linkuse as main transcript	c.4148C>T	p.Thr1383Met	missense_variant	53/54	1	NM_001844.5	P1	P02458-2
COL2A1	ENST00000337299.7 linkuse as main transcript	c.3941C>T	p.Thr1314Met	missense_variant	52/53	1			P02458-1
COL2A1	ENST00000493991.5 linkuse as main transcript	n.3234C>T		non_coding_transcript_exon_variant	36/37	2

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000155

AC:

AN:

251458

Hom.:

AF XY:

0.000169

AC XY:

AN XY:

135900

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.0000980

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000264

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.0000677

AC:

AN:

1461880

Hom.:

Cov.:

AF XY:

0.0000743

AC XY:

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.000115

Gnomad4 EAS exome

AF:

0.000202

Gnomad4 SAS exome

AF:

0.000174

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.0000594

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152236

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000262

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000385

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.0000507

Hom.:

Bravo

AF:

0.000193

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000222

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 24, 2024	Identified in a patient with hip pain and avascular necrosis of the femoral head whose niece had a history of epiphyseal dysplasia but did not harbor any variants in the COL2A1 gene and also identified in a patient with early-onset bilateral sensorineural hearing loss (PMID: 23967202, 21671384); Not located in the triple helical region, where the majority of pathogenic missense variants occur (HGMD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 23967202, 27183340, 30328481, 33451138, 34088323, 21671384) -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	May 30, 2022	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 11, 2023	- -

Avascular necrosis of femoral head, primary, 1

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Genomic Research Center, Shahid Beheshti University of Medical Sciences	Dec 18, 2017	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jul 01, 2011	- -

COL2A1-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 13, 2024

The COL2A1 c.4148C>T variant is predicted to result in the amino acid substitution p.Thr1383Met. This variant has been reported in the heterozygous state in an individual with avascular necrosis of the femur head (Kannu et al. 2011. PubMed ID: 21671384) and in an individual with deafness (Table S2, Miyagawa et al. 2013. PubMed ID: 23967202). This variant is reported in 0.024% of alleles in individuals of European (Non-Finnish) descent in gnomAD. In ClinVar, this variant has classifications ranging from Likely Benign to Likely Pathogenic (https://www.ncbi.nlm.nih.gov/clinvar/variation/29637/). At this time the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.048

BayesDel_noAF

Uncertain

-0.010

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.72

D;.

Eigen

Uncertain

0.23

Eigen_PC

Uncertain

0.31

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.93

D;D

M_CAP

Benign

0.031

MetaRNN

Benign

0.37

T;T

MetaSVM

Uncertain

-0.20

MutationAssessor

Uncertain

2.3

M;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.60

PROVEAN

Uncertain

-2.4

N;D

REVEL

Uncertain

0.52

Sift

Uncertain

0.022

D;D

Sift4G

Uncertain

0.018

D;D

Polyphen

0.44

B;B

Vest4

0.80

MVP

0.86

MPC

0.33

ClinPred

0.14

GERP RS

5.1

Varity_R

0.61

gMVP

0.77

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