chr7-94429329-A-C

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 1P and 3B. PP2BP4_ModerateBP6

The NM_000089.4(COL1A2):c.3853A>C(p.Asn1285His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000891 in 1,614,148 control chromosomes in the GnomAD database, including 1 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 0.00055 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00093 ( 1 hom. )

Consequence

COL1A2
NM_000089.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7B:6

Conservation

PhyloP100: 2.49

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 -2 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=0.11695647).

BP6

Variant 7-94429329-A-C is Benign according to our data. Variant chr7-94429329-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 373178.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=7, Benign=1, Likely_benign=5}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL1A2	NM_000089.4 link	c.3853A>C	p.Asn1285His	missense_variant	Exon 51 of 52	ENST00000297268.11	NP_000080.2	P08123A0A0S2Z3H5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL1A2	ENST00000297268.11 link	c.3853A>C	p.Asn1285His	missense_variant	Exon 51 of 52	1	NM_000089.4	ENSP00000297268.6	P08123
COL1A2	ENST00000464916.1 link	n.901A>C		non_coding_transcript_exon_variant	Exon 3 of 4	2
COL1A2	ENST00000481570.5 link	n.4634A>C		non_coding_transcript_exon_variant	Exon 8 of 8	2

Frequencies

GnomAD3 genomes

AF:

0.000552

AC:

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000851

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:

0.000941

Gnomad OTH

AF:

0.000957

GnomAD3 exomes

AF:

0.000470

AC:

118

AN:

251074

Hom.:

AF XY:

0.000442

AC XY:

AN XY:

135690

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.000752

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000416

Gnomad NFE exome

AF:

0.000705

Gnomad OTH exome

AF:

0.000327

GnomAD4 exome

AF:

0.000926

AC:

1354

AN:

1461844

Hom.:

Cov.:

AF XY:

0.000847

AC XY:

616

AN XY:

727216

show subpopulations

Gnomad4 AFR exome

AF:

0.000119

Gnomad4 AMR exome

AF:

0.000783

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.000356

Gnomad4 NFE exome

AF:

0.00113

Gnomad4 OTH exome

AF:

0.000646

GnomAD4 genome

AF:

0.000552

AC:

AN:

152304

Hom.:

Cov.:

AF XY:

0.000550

AC XY:

AN XY:

74486

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.000850

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000941

Gnomad4 OTH

AF:

0.000947

Alfa

AF:

0.000803

Hom.:

Bravo

AF:

0.000540

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00116

AC:

ExAC

AF:

0.000453

AC:

EpiCase

AF:

0.000654

EpiControl

AF:

0.000356

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7Benign:6

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Apr 16, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 14, 2018

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 01, 2018

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Uncertain:1Benign:1

Nov 17, 2016

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The N1285H variant in the COL1A2 gene has published as a variant of uncertain significance in a patient with OI who also harbored a known pathogenic variant in a different gene (Pollitt et al., 2006). Although not present in the homozygous state, the NHLBI ESP Exome Sequencing Project reports N1285H was observed in 10/8600 alleles (0.12%) from individuals of European background, indicating it may be a rare variant in this population. The N1285H variant is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. This substitution occurs at a position that is not conserved. However, in silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret N1285H as a variant of uncertain significance.Therefore, based on the currently available information, it is unclear whether this variant is pathogenic or rare benign. This result cannot be interpreted for diagnosis or used for family member screening at this time. -

Feb 03, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: COL1A2 c.3853A>C (p.Asn1285His) results in a conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00047 in 251220 control chromosomes. The observed variant frequency is approximately 17 fold of the estimated maximal expected allele frequency for a pathogenic variant in COL1A2 causing Osteogenesis Imperfecta phenotype (2.8e-05). c.3853A>C has been reported in the literature in one individual affected with Osteogenesis Imperfecta (Pollitt_2006). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 16786509). ClinVar contains an entry for this variant (Variation ID: 373178). Based on the evidence outlined above, the variant was classified as likely benign. -

Osteogenesis imperfecta

Uncertain:1Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Mar 02, 2021

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Osteoporosis;C0268358:Osteogenesis imperfecta, perinatal lethal;C0268362:Osteogenesis imperfecta type III;C0268363:Osteogenesis imperfecta with normal sclerae, dominant form;C4303789:Ehlers-Danlos syndrome, cardiac valvular type;C5436847:Combined osteogenesis imperfecta and Ehlers-Danlos syndrome 2;CN293783:Ehlers-danlos syndrome, arthrochalasia type, 2

Uncertain:1

Apr 15, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Ehlers-Danlos syndrome

Uncertain:1

Mar 02, 2021

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Postmenopausal osteoporosis;C0268358:Osteogenesis imperfecta, perinatal lethal;C0268362:Osteogenesis imperfecta type III;C0268363:Osteogenesis imperfecta with normal sclerae, dominant form;C4303789:Ehlers-Danlos syndrome, cardiac valvular type;CN293783:Ehlers-danlos syndrome, arthrochalasia type, 2

Uncertain:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Ehlers-danlos syndrome, arthrochalasia type, 2

Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

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

Benign:1

Jan 21, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Benign:1

Nov 11, 2019

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.31

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.68

D;.

Eigen

Uncertain

0.28

Eigen_PC

Uncertain

0.24

FATHMM_MKL

Uncertain

0.83

LIST_S2

Uncertain

0.87

D;D

M_CAP

Benign

0.055

MetaRNN

Benign

0.12

T;T

MetaSVM

Uncertain

-0.052

MutationAssessor

Pathogenic

2.9

M;.

PrimateAI

Benign

0.30

PROVEAN

Uncertain

-3.9

D;.

REVEL

Uncertain

0.43

Sift

Pathogenic

0.0

D;.

Sift4G

Uncertain

0.0020

D;D

Polyphen

0.77

P;.

Vest4

0.23

MVP

0.84

MPC

0.22

ClinPred

0.12

GERP RS

2.6

Varity_R

0.50

gMVP

0.60

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