7-94409720-C-T

Position:

• chr7-94409720-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_000089.4(COL1A2):​c.937-3C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.771 in 1,613,902 control chromosomes in the GnomAD database, including 483,060 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.81 (49961 hom., cov: 30)
  • Exomes 𝑓: 0.77 (433099 hom.)
• Consequence: COL1A2 NM_000089.4 splice_region, intron
• Scores: Splicing: ADA: 0.0002244
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:19
• Conservation: PhyloP100: 0.249

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.66).
• BP6: Variant 7-94409720-C-T is Benign according to our data. Variant chr7-94409720-C-T is described in ClinVar as [Benign]. Clinvar id is 254958.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr7-94409720-C-T is described in Lovd as [Benign].
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.892 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL1A2	NM_000089.4	c.937-3C>T		splice_region_variant, intron_variant		ENST00000297268.11	NP_000080.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL1A2	ENST00000297268.11	c.937-3C>T		splice_region_variant, intron_variant		1	NM_000089.4	ENSP00000297268.6

Frequencies

GnomAD3 genomes AF: 0.807 AC: 122632 AN: 151974 Hom.: 49911 Cov.: 30

Gnomad AFR AF: 0.899

Gnomad AMI AF: 0.716

Gnomad AMR AF: 0.799

Gnomad ASJ AF: 0.667

Gnomad EAS AF: 0.914

Gnomad SAS AF: 0.662

Gnomad FIN AF: 0.785

Gnomad MID AF: 0.665

Gnomad NFE AF: 0.768

Gnomad OTH AF: 0.764

GnomAD3 exomes AF: 0.776 AC: 195084 AN: 251468 Hom.: 76447 AF XY: 0.763 AC XY: 103734 AN XY: 135910

Gnomad AFR exome AF: 0.903

Gnomad AMR exome AF: 0.820

Gnomad ASJ exome AF: 0.676

Gnomad EAS exome AF: 0.909

Gnomad SAS exome AF: 0.653

Gnomad FIN exome AF: 0.789

Gnomad NFE exome AF: 0.764

Gnomad OTH exome AF: 0.739

GnomAD4 exome AF: 0.768 AC: 1122367 AN: 1461810 Hom.: 433099 Cov.: 57 AF XY: 0.763 AC XY: 554824 AN XY: 727210

Gnomad4 AFR exome AF: 0.896

Gnomad4 AMR exome AF: 0.817

Gnomad4 ASJ exome AF: 0.672

Gnomad4 EAS exome AF: 0.938

Gnomad4 SAS exome AF: 0.649

Gnomad4 FIN exome AF: 0.785

Gnomad4 NFE exome AF: 0.768

Gnomad4 OTH exome AF: 0.757

GnomAD4 genome AF: 0.807 AC: 122741 AN: 152092 Hom.: 49961 Cov.: 30 AF XY: 0.804 AC XY: 59814 AN XY: 74352

Gnomad4 AFR AF: 0.899

Gnomad4 AMR AF: 0.799

Gnomad4 ASJ AF: 0.667

Gnomad4 EAS AF: 0.914

Gnomad4 SAS AF: 0.662

Gnomad4 FIN AF: 0.785

Gnomad4 NFE AF: 0.768

Gnomad4 OTH AF: 0.765

Alfa AF: 0.780 Hom.: 26448

Bravo AF: 0.816

Asia WGS AF: 0.799 AC: 2779 AN: 3478

EpiCase AF: 0.752

EpiControl AF: 0.754

ClinVar

Significance: Benign

Submissions summary: Benign:19

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:7

Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	May 04, 2012	- -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Oct 09, 2015	- -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, Amsterdam University Medical Center	-	- -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2016	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -

Osteogenesis imperfecta Benign:2

Benign, criteria provided, single submitter	clinical testing	Genome Diagnostics Laboratory, The Hospital for Sick Children	Jul 18, 2022	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	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. -

Ehlers-danlos syndrome, arthrochalasia type, 2 Benign:2

Benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	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. -

not provided Benign:2

Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 30, 2023	- -

Osteogenesis imperfecta type III Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Jul 22, 2021

- -

Ehlers-Danlos syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Jul 16, 2022

- -

Osteogenesis imperfecta with normal sclerae, dominant form Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Jul 22, 2021

- -

Osteogenesis imperfecta, perinatal lethal Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Jul 22, 2021

- -

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

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 01, 2024

- -

Cardiovascular phenotype Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 04, 2018

This alteration is classified as 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
BayesDel_noAF	Benign	-0.66
CADD	Benign	7.4
DANN	Benign	0.73

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00022
dbscSNV1_RF	Benign	0.0
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs42519; hg19: chr7-94039032;