NM_000089.4:c.1246G>A

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 1P and 2B. PP2BP4_Moderate

The NM_000089.4(COL1A2):c.1246G>A(p.Val416Ile) variant causes a missense change. The variant allele was found at a frequency of 0.0000985 in 1,613,922 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).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 30)

Exomes 𝑓: 0.00010 ( 0 hom. )

Consequence

COL1A2
NM_000089.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 5.93

Variant links:

Genes affected

COL1A2 (HGNC:2198): (collagen type I alpha 2 chain) This gene encodes the pro-alpha2 chain of type I collagen whose triple helix comprises two alpha1 chains and one alpha2 chain. Type I is a fibril-forming collagen found in most connective tissues and is abundant in bone, cornea, dermis and tendon. Mutations in this gene are associated with osteogenesis imperfecta types I-IV, Ehlers-Danlos syndrome type VIIB, recessive Ehlers-Danlos syndrome Classical type, idiopathic osteoporosis, and atypical Marfan syndrome. Symptoms associated with mutations in this gene, however, tend to be less severe than mutations in the gene for the alpha1 chain of type I collagen (COL1A1) reflecting the different role of alpha2 chains in matrix integrity. Three transcripts, resulting from the use of alternate polyadenylation signals, have been identified for this gene. [provided by R. Dalgleish, Feb 2008]

COL1A2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PP2

Missense variant in the COL1A2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 437 curated pathogenic missense variants (we use a threshold of 10). The gene has 17 curated benign missense variants. Gene score misZ: 2.1491 (below the threshold of 3.09). Trascript score misZ: 3.5344 (above the threshold of 3.09). GenCC associations: The gene is linked to Ehlers-Danlos/osteogenesis imperfecta syndrome, Ehlers-Danlos syndrome, cardiac valvular type, ehlers-danlos syndrome, arthrochalasia type, 2, Ehlers-Danlos syndrome, arthrochalasia type, osteogenesis imperfecta type 3, high bone mass osteogenesis imperfecta, combined osteogenesis imperfecta and Ehlers-Danlos syndrome 2, osteogenesis imperfecta type 4, osteogenesis imperfecta type 2, osteogenesis imperfecta type 1.

BP4

Computational evidence support a benign effect (MetaRNN=0.14632818).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL1A2	NM_000089.4 link	c.1246G>A	p.Val416Ile	missense_variant	Exon 22 of 52	ENST00000297268.11	NP_000080.2	P08123A0A0S2Z3H5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL1A2	ENST00000297268.11 link	c.1246G>A	p.Val416Ile	missense_variant	Exon 22 of 52	1	NM_000089.4	ENSP00000297268.6		P08123

Frequencies

GnomAD3 genomes

AF:

0.0000461

AC:

AN:

151992

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000484

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000622

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000479

GnomAD3 exomes

AF:

0.0000835

AC:

AN:

251480

Hom.:

AF XY:

0.000103

AC XY:

AN XY:

135912

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000555

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000104

AC:

152

AN:

1461816

Hom.:

Cov.:

AF XY:

0.0000990

AC XY:

AN XY:

727222

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000464

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000935

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152106

Hom.:

Cov.:

AF XY:

0.0000672

AC XY:

AN XY:

74356

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000623

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000474

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.0000604

ExAC

AF:

0.0000576

AC:

Asia WGS

AF:

0.00144

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Sep 03, 2019

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has not been reported in association with connective tissue disorders to the best of our knowledge; In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Reported in ClinVar but additional evidence is not available (ClinVar Variant ID# 456803; Landrum et al., 2016); This variant is associated with the following publications: (PMID: 28991257) -

Apr 03, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The COL1A2 c.1246G>A; p.Val416Ile variant (rs550867796), to our knowledge, is not reported in the medical literature in association with a skeletal or connective tissue disorder but is reported in ClinVar (Variation ID: 456803). This variant is found in the South Asian population with an allele frequency of 0.06% (17/30,616 alleles) in the Genome Aggregation Database (v2.1.1). Computational analyses are uncertain whether this variant is neutral or deleterious (REVEL: 0.373). Due to limited information, the clinical significance of this variant is uncertain at this time. -

Osteogenesis imperfecta type III

Uncertain:1

Neuberg Centre For Genomic Medicine, NCGM

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The missense variant p.Val416Ile in COL1A2 (NM_000089.4) has been reported to the ClinVar database with conflicting interpretation of pathogenicity [Uncertain significance/ likely benign]. The p.Val416Ile variant has allele frequency of 0.008% in the gnomAD Exomes database. The amino acid Val at position 416 is changed to a Ile changing protein sequence and it might alter its composition and physico-chemical properties. In silico tools predict the variant to be tolerated. The residue is conserved across species. The amino acid change p.Val416Ile in COL1A2 is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Uncertain Significance (VUS). -

Osteogenesis imperfecta type I;C0268335:Ehlers-Danlos syndrome, classic type, 1

Benign:1

Jan 20, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.076

BayesDel_addAF

Benign

-0.10

BayesDel_noAF

Uncertain

-0.040

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.14

T;.

Eigen

Benign

0.057

Eigen_PC

Uncertain

0.25

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.92

D;D

M_CAP

Benign

0.049

MetaRNN

Benign

0.15

T;T

MetaSVM

Uncertain

0.18

MutationAssessor

Benign

0.32

N;.

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.73

N;.

REVEL

Uncertain

0.37

Sift

Benign

0.084

T;.

Sift4G

Benign

0.10

T;T

Polyphen

0.077

B;.

Vest4

0.29

MutPred

0.28

Loss of MoRF binding (P = 0.109);.;

MVP

0.86

MPC

2.1

ClinPred

0.068

GERP RS

5.8

Varity_R

0.044

gMVP

0.14

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