rs587780588

Variant names:

• chr13-110183002-C-T
• rs587780588
• NM_001845.6:c.2086G>A

Variant summary

Our verdict is Pathogenic. The variant received 20 ACMG points: 20P and 0B. PS3 PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_001845.6(COL4A1):​c.2086G>A​(p.Gly696Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). ClinVar reports functional evidence for this variant: "SCV000330184: Affects a glycine residue in a Gly-X-Y motif in the triple helical region of the COL4A1 gene, where the majority of pathogenic missense variants occur, and is predicted to disrupt normal protein folding and function (PMIDs 22522439 23225343)".

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: COL4A1 NM_001845.6 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 7.19
• Publications: 4 publications found

Genes affected

COL4A1 (HGNC:2202): (collagen type IV alpha 1 chain) This gene encodes a type IV collagen alpha protein. Type IV collagen proteins are integral components of basement membranes. This gene shares a bidirectional promoter with a paralogous gene on the opposite strand. The protein consists of an amino-terminal 7S domain, a triple-helix forming collagenous domain, and a carboxy-terminal non-collagenous domain. It functions as part of a heterotrimer and interacts with other extracellular matrix components such as perlecans, proteoglycans, and laminins. In addition, proteolytic cleavage of the non-collagenous carboxy-terminal domain results in a biologically active fragment known as arresten, which has anti-angiogenic and tumor suppressor properties. Mutations in this gene cause porencephaly, cerebrovascular disease, and renal and muscular defects. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

COL4A1 Gene-Disease associations (from GenCC):

• brain small vessel disease 1 with or without ocular anomalies

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, G2P, Genomics England PanelApp
• autosomal dominant familial hematuria-retinal arteriolar tortuosity-contractures syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Genomics England PanelApp, Orphanet
• microangiopathy and leukoencephalopathy, pontine, autosomal dominant

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• familial porencephaly

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• pontine autosomal dominant microangiopathy with leukoencephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• retinal arterial tortuosity

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• muscular dystrophy-dystroglycanopathy, type A

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 20 ACMG points.

• PS3: PS3 evidence extracted from ClinVar submissions: SCV000330184: Affects a glycine residue in a Gly-X-Y motif in the triple helical region of the COL4A1 gene, where the majority of pathogenic missense variants occur, and is predicted to disrupt normal protein folding and function (PMIDs 22522439 23225343)
• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 11 uncertain in NM_001845.6
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.964
• PP5: Variant 13-110183002-C-T is Pathogenic according to our data. Variant chr13-110183002-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 135653.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001845.6. 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
	COL4A1	NM_001845.6	MANE Select	c.2086G>A	p.Gly696Ser	missense	Exon 28 of 52	NP_001836.3	P02462-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL4A1	ENST00000375820.10	TSL:1 MANE Select	c.2086G>A	p.Gly696Ser	missense	Exon 28 of 52	ENSP00000364979.4	P02462-1
	COL4A1	ENST00000650424.2		c.2086G>A	p.Gly696Ser	missense	Exon 28 of 52	ENSP00000497477.2	A0A3B3ISV3
	COL4A1	ENST00000933608.1		c.2086G>A	p.Gly696Ser	missense	Exon 28 of 51	ENSP00000603667.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1460086 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726218

African (AFR) AF: 0.00 AC: 0 AN: 33460

American (AMR) AF: 0.00 AC: 0 AN: 44598

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26104

East Asian (EAS) AF: 0.00 AC: 0 AN: 39690

South Asian (SAS) AF: 0.00 AC: 0 AN: 85886

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52792

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

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111570

Other (OTH) AF: 0.00 AC: 0 AN: 60262

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
2	-	-	Brain small vessel disease 1 with or without ocular anomalies (2)
2	-	-	not provided (2)
1	-	-	Intracranial hemorrhage;C0270685:Cerebral calcification (1)
1	-	-	Intraventricular hemorrhage;C1842581:Abnormal corpus callosum morphology (1)
1	-	-	Retinal arterial tortuosity;C3281105:Hemorrhage, intracerebral, susceptibility to;C4755307:Brain small vessel disease 1 with or without ocular anomalies (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.80
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.91	D
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.95	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Pathogenic	0.95	D
MutationAssessor	Pathogenic	4.2	H
PhyloP100		7.2
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-5.1	D
REVEL	Pathogenic	0.92
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.99
MutPred		0.69		Gain of catalytic residue at P694 (P = 0)
MVP		0.98
MPC		0.44
ClinPred		1.0	D
GERP RS		4.7
Varity_R		0.92
gMVP		1.0
Mutation Taster		=5/95	disease causing (ClinVar)

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: rs587780588; hg19: chr13-110835349;