chr12-47977388-C-G

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 5P and 1B. PM1PM2PP2BP4

The NM_001844.5(COL2A1):c.3205G>C(p.Ala1069Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000124 in 1,613,412 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A1069D) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

COL2A1
NM_001844.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.81

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

achondrogenesis type II
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, ClinGen, G2P, Orphanet, Labcorp Genetics (formerly Invitae)
Kniest dysplasia
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, ClinGen, Labcorp Genetics (formerly Invitae)
platyspondylic dysplasia, Torrance type
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
spondyloepimetaphyseal dysplasia, Strudwick type
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
spondyloepiphyseal dysplasia congenita
Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, G2P, Orphanet, Labcorp Genetics (formerly Invitae)
spondyloepiphyseal dysplasia with metatarsal shortening
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: ClinGen, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
spondylometaphyseal dysplasia
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
spondyloperipheral dysplasia
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
Stickler syndrome type 1
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, ClinGen, Illumina, Orphanet, Genomics England PanelApp
Stickler syndrome, type I, nonsyndromic ocular
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
avascular necrosis of femoral head, primary, 1
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
Legg-Calve-Perthes disease
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
mild spondyloepiphyseal dysplasia due to COL2A1 mutation with early-onset osteoarthritis
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
otospondylomegaepiphyseal dysplasia, autosomal recessive
Inheritance: AD, AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
spondyloepiphyseal dysplasia, Stanescu type
Inheritance: AD Classification: MODERATE, SUPPORTIVE Submitted by: ClinGen, Orphanet
autosomal dominant rhegmatogenous retinal detachment
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
dysspondyloenchondromatosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial avascular necrosis of femoral head
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
hypochondrogenesis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
multiple epiphyseal dysplasia, Beighton type
Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
spondylometaphyseal dysplasia, Schmidt type
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
otospondylomegaepiphyseal dysplasia
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics
vitreoretinopathy with phalangeal epiphyseal dysplasia
Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

COL2A1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM1

In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 3 benign, 2 uncertain in NM_001844.5

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the COL2A1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 376 curated pathogenic missense variants (we use a threshold of 10). The gene has 125 curated benign missense variants. Gene score misZ: 3.2926 (above the threshold of 3.09). Trascript score misZ: 5.3726 (above the threshold of 3.09). GenCC associations: The gene is linked to vitreoretinopathy with phalangeal epiphyseal dysplasia, Stickler syndrome, type I, nonsyndromic ocular, Kniest dysplasia, Stickler syndrome type 1, platyspondylic dysplasia, Torrance type, spondyloepiphyseal dysplasia with metatarsal shortening, spondyloperipheral dysplasia, spondyloepiphyseal dysplasia, Stanescu type, Legg-Calve-Perthes disease, achondrogenesis type II, spondyloepiphyseal dysplasia congenita, multiple epiphyseal dysplasia, Beighton type, mild spondyloepiphyseal dysplasia due to COL2A1 mutation with early-onset osteoarthritis, autosomal dominant rhegmatogenous retinal detachment, spondylometaphyseal dysplasia, spondyloepimetaphyseal dysplasia, Strudwick type, familial avascular necrosis of femoral head, dysspondyloenchondromatosis, spondylometaphyseal dysplasia, Schmidt type, hypochondrogenesis, otospondylomegaepiphyseal dysplasia, autosomal recessive, otospondylomegaepiphyseal dysplasia, avascular necrosis of femoral head, primary, 1.

BP4

Computational evidence support a benign effect (MetaRNN=0.28150916).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL2A1	NM_001844.5 link	c.3205G>C	p.Ala1069Pro	missense_variant	Exon 46 of 54	ENST00000380518.8	NP_001835.3	P02458-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL2A1	ENST00000380518.8 link	c.3205G>C	p.Ala1069Pro	missense_variant	Exon 46 of 54	1	NM_001844.5	ENSP00000369889.3	P02458-2
COL2A1	ENST00000337299.7 link	c.2998G>C	p.Ala1000Pro	missense_variant	Exon 45 of 53	1		ENSP00000338213.6	P02458-1
COL2A1	ENST00000546974.1 link	n.58G>C		non_coding_transcript_exon_variant	Exon 1 of 6	1
COL2A1	ENST00000493991.5 link	n.2291G>C		non_coding_transcript_exon_variant	Exon 29 of 37	2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152154

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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

GnomAD2 exomes

AF:

0.00000399

AC:

AN:

250730

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.0000617

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461258

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726976

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33470

American (AMR)

AF:

0.00

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53164

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111684

Other (OTH)

AF:

0.00

AC:

AN:

60372

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<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:

0.00000657

AC:

AN:

152154

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74304

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41444

American (AMR)

AF:

0.00

AC:

AN:

15278

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68006

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 28, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Disclaimer: This variant has not undergone full assessment. The following are pr eliminary notes: Has not been reported previously, but extremely rare variant. C OL2A1 is stronlgy associated with several types of skeletal dysplasias that may present with hip dysplasia. The majority of variants in the gene are missense, a ltering a Glycine residue. This variant may be worth testing in the parents to c heck de novo occurrence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.036

BayesDel_noAF

Benign

-0.11

CADD

Benign

(source)

DANN

Benign

0.92

DEOGEN2

Uncertain

0.45

T;.

Eigen

Benign

-0.63

Eigen_PC

Benign

-0.48

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.89

D;D

M_CAP

Uncertain

0.13

MetaRNN

Benign

0.28

T;T

MetaSVM

Uncertain

-0.064

MutationAssessor

Benign

-0.30

N;.

PhyloP100

1.8

PrimateAI

Benign

0.48

PROVEAN

Benign

-1.9

N;N

REVEL

Uncertain

0.47

Sift

Benign

0.17

T;T

Sift4G

Benign

0.41

T;T

Polyphen

0.54

P;B

Vest4

0.50

MVP

0.49

MPC

0.41

ClinPred

0.27

GERP RS

3.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.37

gMVP

0.50

Mutation Taster

=36/64

disease causing

(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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over