rs377278762

chr7-94426472-C-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 3P and 5B. PM1 PP2 BP4_Strong BP6

The NM_000089.4(COL1A2):c.3047C>A(p.Pro1016His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000946 in 1,607,348 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. P1016P) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000099 (1 hom.)
• Consequence: COL1A2 NM_000089.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6 B:3
• Conservation: PhyloP100: 0.817

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 Likely_benign. Variant got -2 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_000089.4
• PP2: Missense variant where missense usually causes diseases, COL1A2
• BP4: Computational evidence support a benign effect (MetaRNN=0.06471735).
• BP6: Variant 7-94426472-C-A is Benign according to our data. Variant chr7-94426472-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 281098.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=6}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL1A2	NM_000089.4	c.3047C>A	p.Pro1016His	missense_variant	46/52	ENST00000297268.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL1A2	ENST00000297268.11	c.3047C>A	p.Pro1016His	missense_variant	46/52	1	NM_000089.4	P1
COL1A2	ENST00000478215.1	n.606C>A		non_coding_transcript_exon_variant	4/4	3
COL1A2	ENST00000481570.5	n.3020C>A		non_coding_transcript_exon_variant	5/8	2
COL1A2	ENST00000488121.1			upstream_gene_variant		2

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152100 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00144

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000113 AC: 27 AN: 238098 Hom.: 0 AF XY: 0.000109 AC XY: 14 AN XY: 128032

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000895

Gnomad ASJ exome AF: 0.00103

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000355

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000836

Gnomad OTH exome AF: 0.000689

GnomAD4 exome AF: 0.0000990 AC: 144 AN: 1455248 Hom.: 1 Cov.: 32 AF XY: 0.000105 AC XY: 76 AN XY: 722814

Gnomad4 AFR exome AF: 0.000239

Gnomad4 AMR exome AF: 0.0000682

Gnomad4 ASJ exome AF: 0.00201

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000119

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000532

Gnomad4 OTH exome AF: 0.000233

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152100 Hom.: 0 Cov.: 32 AF XY: 0.0000538 AC XY: 4 AN XY: 74290

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00144

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000266 Hom.: 0

Bravo AF: 0.0000680

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000741 AC: 9

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 10, 2015	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Mar 15, 2022	In silico analysis supports that this missense variant does not alter protein structure/function; Occurs in the triple helical domain at the X position in the canonical Gly-X-Y repeat. Although this variant may have an effect on normal protein folding and function, missense substitution at the X position is not a common mechanism of disease (HGMD); This variant is associated with the following publications: (PMID: 25944380, 24077912, 27535533, 34091789, 26177859) -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Mar 03, 2023	- -

Osteogenesis imperfecta Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Ehlers-Danlos syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

May 16, 2022

- -

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

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 01, 2021

The p.P1016H variant (also known as c.3047C>A), located in coding exon 46 of the COL1A2 gene, results from a C to A substitution at nucleotide position 3047. The proline at codon 1016 is replaced by histidine, an amino acid with similar properties. This alteration has been reported in a subject with osteogenesis imperfecta (OI) (Lindahl K et al. Eur. J. Hum. Genet., 2015 Aug;23:1042-50). This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Ehlers-danlos syndrome, arthrochalasia type, 2 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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 likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

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

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Nov 22, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.079
BayesDel_addAF	Benign	-0.061	T
BayesDel_noAF	Benign	-0.13
Cadd	Benign	19
Dann	Uncertain	0.98
DEOGEN2	Benign	0.11	T;.
Eigen	Benign	-0.37
Eigen_PC	Benign	-0.27
FATHMM_MKL	Benign	0.31	N
LIST_S2	Benign	0.64	T;T
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.065	T;T
MetaSVM	Uncertain	0.18	D
MutationAssessor	Pathogenic	3.0	M;.
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-0.49	N;.
REVEL	Benign	0.27
Sift	Benign	0.12	T;.
Sift4G	Benign	0.10	T;T
Polyphen		0.0	B;.
Vest4		0.099
MVP		0.49
MPC		0.24
ClinPred		0.090	T
GERP RS		2.8
Varity_R		0.094
gMVP		0.37

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

Other links and lift over

dbSNP: rs377278762; hg19: chr7-94055784;