12-48004227-G-C

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_001844.5(COL2A1):c.85+10C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00068 in 1,541,102 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0012 ( 2 hom., cov: 33)

Exomes 𝑓: 0.00062 ( 1 hom. )

Consequence

COL2A1
NM_001844.5 intron

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:7

Conservation

PhyloP100: 1.51

Publications

0 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: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.74).

BP6

Variant 12-48004227-G-C is Benign according to our data. Variant chr12-48004227-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 308937.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00121 (184/152258) while in subpopulation NFE AF = 0.00146 (99/67998). AF 95% confidence interval is 0.00122. There are 2 homozygotes in GnomAd4. There are 114 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 2 Unknown,AD,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001844.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL2A1	NM_001844.5	MANE Select	c.85+10C>G		intron	N/A	NP_001835.3
	COL2A1	NM_033150.3		c.85+10C>G		intron	N/A	NP_149162.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
COL2A1	ENST00000380518.8	TSL:1 MANE Select	c.85+10C>G	intron	N/A	ENSP00000369889.3
COL2A1	ENST00000337299.7	TSL:1	c.85+10C>G	intron	N/A	ENSP00000338213.6
COL2A1	ENST00000928357.1		c.85+10C>G	intron	N/A	ENSP00000598416.1

Frequencies

GnomAD3 genomes

AF:

0.00121

AC:

184

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

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:

0.00745

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00146

Gnomad OTH

AF:

0.00191

GnomAD2 exomes

AF:

0.000903

AC:

138

AN:

152822

AF XY:

0.000816

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000162

Gnomad ASJ exome

AF:

0.000590

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00552

Gnomad NFE exome

AF:

0.000714

Gnomad OTH exome

AF:

0.000685

GnomAD4 exome

AF:

0.000622

AC:

864

AN:

1388844

Hom.:

Cov.:

AF XY:

0.000620

AC XY:

425

AN XY:

685610

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31364

American (AMR)

AF:

0.000140

AC:

AN:

35666

Ashkenazi Jewish (ASJ)

AF:

0.000598

AC:

AN:

25098

East Asian (EAS)

AF:

0.00

AC:

AN:

35678

South Asian (SAS)

AF:

0.0000253

AC:

AN:

78992

European-Finnish (FIN)

AF:

0.00596

AC:

290

AN:

48682

Middle Eastern (MID)

AF:

0.000178

AC:

AN:

5626

European-Non Finnish (NFE)

AF:

0.000480

AC:

514

AN:

1070084

Other (OTH)

AF:

0.000642

AC:

AN:

57654

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.461

Heterozygous variant carriers

118

158

197

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:

0.00121

AC:

184

AN:

152258

Hom.:

Cov.:

AF XY:

0.00153

AC XY:

114

AN XY:

74454

show subpopulations

African (AFR)

AF:

0.0000481

AC:

AN:

41576

American (AMR)

AF:

0.00

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5152

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00745

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00146

AC:

AN:

67998

Other (OTH)

AF:

0.00189

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.484

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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

Alfa

AF:

0.00248

Hom.:

Bravo

AF:

0.000389

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

Connective tissue disorder (2)

not specified (1)

Stickler syndrome type 1 (1)

Type II Collagenopathies (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.74

CADD

Benign

(source)

DANN

Benign

0.59

PhyloP100

1.5

PromoterAI

-0.057

Neutral

(source)

Mutation Taster

=100/0

polymorphism

(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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over