NM_000088.4:c.3233T>C

Variant names:

• chr17-50188124-A-G
• rs767525556
• NM_000088.4:c.3233T>C

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 3P and 7B. PM1 PP2 BP4_Moderate BP6 BS2

The NM_000088.4(COL1A1):​c.3233T>C​(p.Val1078Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000318 in 1,576,772 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V1078D) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00012 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00034 (0 hom.)
• Consequence: COL1A1 NM_000088.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6 B:3
• Conservation: PhyloP100: 3.22
• Publications: 1 publications found

Genes affected

COL1A1 (HGNC:2197): (collagen type I alpha 1 chain) This gene encodes the pro-alpha1 chains 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 VIIA, Ehlers-Danlos syndrome Classical type, Caffey Disease and idiopathic osteoporosis. Reciprocal translocations between chromosomes 17 and 22, where this gene and the gene for platelet-derived growth factor beta are located, are associated with a particular type of skin tumor called dermatofibrosarcoma protuberans, resulting from unregulated expression of the growth factor. Two transcripts, resulting from the use of alternate polyadenylation signals, have been identified for this gene. [provided by R. Dalgleish, Feb 2008]

COL1A1 Gene-Disease associations (from GenCC):

• Caffey disease

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, Ambry Genetics
• COL1A1-related Ehlers-Danlos syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• combined osteogenesis imperfecta and Ehlers-Danlos syndrome 1

  Inheritance: AD Classification: DEFINITIVE, MODERATE Submitted by: ClinGen, Ambry Genetics
• Ehlers-Danlos syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• Ehlers-Danlos syndrome, arthrochalasia type

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Orphanet
• osteogenesis imperfecta

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• osteogenesis imperfecta type 1

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• osteogenesis imperfecta type 2

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• osteogenesis imperfecta type 3

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Orphanet
• osteogenesis imperfecta type 4

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, G2P, Orphanet
• Ehlers-Danlos syndrome, classic type, 1

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen
• Ehlers-Danlos syndrome, classic type

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Ehlers-Danlos/osteogenesis imperfecta syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• high bone mass osteogenesis imperfecta

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 8 uncertain in NM_000088.4
• PP2: Missense variant in the COL1A1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 368 curated pathogenic missense variants (we use a threshold of 10). The gene has 98 curated benign missense variants. Gene score misZ: 3.5319 (above the threshold of 3.09). Trascript score misZ: 5.7733 (above the threshold of 3.09). GenCC associations: The gene is linked to high bone mass osteogenesis imperfecta, Ehlers-Danlos syndrome, arthrochalasia type, combined osteogenesis imperfecta and Ehlers-Danlos syndrome 1, Caffey disease, osteogenesis imperfecta type 4, osteogenesis imperfecta type 3, Ehlers-Danlos syndrome, classic type, Ehlers-Danlos syndrome, osteogenesis imperfecta type 2, osteogenesis imperfecta type 1, Ehlers-Danlos syndrome, classic type, 1, Ehlers-Danlos/osteogenesis imperfecta syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.19499975).
• BP6: Variant 17-50188124-A-G is Benign according to our data. Variant chr17-50188124-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 324102.
• BS2: High AC in GnomAd4 at 18 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000088.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL1A1	NM_000088.4	MANE Select	c.3233T>C	p.Val1078Ala	missense	Exon 44 of 51	NP_000079.2	P02452

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL1A1	ENST00000225964.10	TSL:1 MANE Select	c.3233T>C	p.Val1078Ala	missense	Exon 44 of 51	ENSP00000225964.6	P02452
	COL1A1	ENST00000861334.1		c.3233T>C	p.Val1078Ala	missense	Exon 44 of 51	ENSP00000531393.1
	COL1A1	ENST00000861339.1		c.3233T>C	p.Val1078Ala	missense	Exon 44 of 51	ENSP00000531398.1

Frequencies

GnomAD3 genomes AF: 0.000118 AC: 18 AN: 152060 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

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: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000265

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000124 AC: 23 AN: 185460 AF XY: 0.000130

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000364

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000288

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000339 AC: 483 AN: 1424712 Hom.: 0 Cov.: 36 AF XY: 0.000315 AC XY: 222 AN XY: 705728

African (AFR) AF: 0.00 AC: 0 AN: 32616

American (AMR) AF: 0.0000257 AC: 1 AN: 38836

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25448

East Asian (EAS) AF: 0.00 AC: 0 AN: 37806

South Asian (SAS) AF: 0.00 AC: 0 AN: 82694

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50828

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5724

European-Non Finnish (NFE) AF: 0.000421 AC: 460 AN: 1091858

Other (OTH) AF: 0.000374 AC: 22 AN: 58902

GnomAD4 genome AF: 0.000118 AC: 18 AN: 152060 Hom.: 0 Cov.: 32 AF XY: 0.0000942 AC XY: 7 AN XY: 74302

African (AFR) AF: 0.00 AC: 0 AN: 41390

American (AMR) AF: 0.00 AC: 0 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3464

East Asian (EAS) AF: 0.00 AC: 0 AN: 5174

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000265 AC: 18 AN: 67986

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.000187 Hom.: 0

Bravo AF: 0.000140

ExAC AF: 0.0000672 AC: 8

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	Cardiovascular phenotype (1)
-	-	1	COL1A1-related disorder (1)
-	1	-	Ehlers-Danlos syndrome (1)
-	-	1	Ehlers-Danlos syndrome, arthrochalasia type (1)
-	1	-	Infantile cortical hyperostosis (1)
-	1	-	Infantile cortical hyperostosis;C0023931:Osteogenesis imperfecta type I;C0029458:Postmenopausal osteoporosis;C0268358:Osteogenesis imperfecta, perinatal lethal;C0268362:Osteogenesis imperfecta type III;C0268363:Osteogenesis imperfecta with normal sclerae, dominant form;C4551623:Ehlers-Danlos syndrome, arthrochalasia type (1)
-	1	-	not provided (1)
-	1	-	Osteogenesis imperfecta (1)
-	-	1	Osteogenesis imperfecta type I (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.064
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.20
CADD	Benign	10
DANN	Benign	0.74
Eigen	Benign	-0.90
Eigen_PC	Benign	-0.84
FATHMM_MKL	Benign	0.11	N
M_CAP	Uncertain	0.16	D
MetaRNN	Benign	0.19	T
MetaSVM	Benign	-0.57	T
PhyloP100		3.2
PrimateAI	Benign	0.27	T
PROVEAN	Benign	0.40	N
REVEL	Benign	0.23
Sift	Benign	1.0	T
Sift4G	Benign	0.93	T
Vest4		0.17
MVP		0.73
MPC		0.68
ClinPred		0.034	T
GERP RS		0.55
gMVP		0.55
Mutation Taster		=99/1	polymorphism

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

Other links and lift over

dbSNP: rs767525556; hg19: chr17-48265485;