NM_001845.6:c.44C>T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_001845.6(COL4A1):c.44C>T(p.Ala15Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000088 in 1,477,470 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A15T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000083 ( 0 hom. )

Consequence

COL4A1
NM_001845.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 0.949

Publications

0 publications found

Variant links:

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 links:

COL4A2 (HGNC:2203): (collagen type IV alpha 2 chain) This gene encodes one of the six subunits of type IV collagen, the major structural component of basement membranes. The C-terminal portion of the protein, known as canstatin, is an inhibitor of angiogenesis and tumor growth. Like the other members of the type IV collagen gene family, this gene is organized in a head-to-head conformation with another type IV collagen gene so that each gene pair shares a common promoter. [provided by RefSeq, Jul 2008]

COL4A2 Gene-Disease associations (from GenCC):

porencephaly 2
Inheritance: AD Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
COL4A1 or COL4A2-related cerebral small vessel disease
Inheritance: AD Classification: MODERATE Submitted by: Illumina
familial porencephaly
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

COL4A2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.18619075).

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.44C>T	p.Ala15Val	missense	Exon 1 of 52	NP_001836.3	P02462-1
	COL4A1	NM_001303110.2		c.44C>T	p.Ala15Val	missense	Exon 1 of 25	NP_001290039.1	P02462-2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
COL4A1	ENST00000375820.10	TSL:1 MANE Select	c.44C>T	p.Ala15Val	missense	Exon 1 of 52	ENSP00000364979.4	P02462-1
COL4A1	ENST00000543140.6	TSL:1	c.44C>T	p.Ala15Val	missense	Exon 1 of 25	ENSP00000443348.1	P02462-2
COL4A1	ENST00000650424.2		c.44C>T	p.Ala15Val	missense	Exon 1 of 52	ENSP00000497477.2	A0A3B3ISV3

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152148

Hom.:

Cov.:

show subpopulations

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000352

AC:

AN:

85198

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000473

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000322

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000830

AC:

AN:

1325322

Hom.:

Cov.:

AF XY:

0.00000459

AC XY:

AN XY:

652952

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26934

American (AMR)

AF:

0.00

AC:

AN:

28568

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23434

East Asian (EAS)

AF:

0.0000339

AC:

AN:

29498

South Asian (SAS)

AF:

0.00

AC:

AN:

73154

European-Finnish (FIN)

AF:

0.00

AC:

AN:

32876

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3974

European-Non Finnish (NFE)

AF:

0.00000951

AC:

AN:

1051816

Other (OTH)

AF:

0.00

AC:

AN:

55068

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.480

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152148

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74318

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41450

American (AMR)

AF:

0.00

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5154

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

ClinVar submissions as Germline

Significance:Uncertain significance

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Inborn genetic diseases (1)

not provided (1)

Retinal arterial tortuosity;C2673195:Autosomal dominant familial hematuria-retinal arteriolar tortuosity-contractures syndrome;C3281105:Hemorrhage, intracerebral, susceptibility to;C4551998:Brain small vessel disease 1 with or without ocular anomalies;C5231411:Microangiopathy and leukoencephalopathy, pontine, autosomal dominant (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.027

BayesDel_noAF

Benign

-0.28

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.16

Eigen

Benign

-0.56

Eigen_PC

Benign

-0.41

FATHMM_MKL

Benign

0.55

LIST_S2

Benign

0.56

M_CAP

Pathogenic

0.92

MetaRNN

Benign

0.19

MetaSVM

Benign

-0.64

MutationAssessor

Benign

0.34

PhyloP100

0.95

PrimateAI

Pathogenic

0.87

PROVEAN

Benign

0.27

REVEL

Benign

0.17

Sift

Benign

0.67

Sift4G

Benign

0.55

Polyphen

0.0020

Vest4

0.20

MutPred

0.42

Gain of catalytic residue at A15 (P = 0.0021)

MVP

0.51

MPC

0.38

ClinPred

0.046

GERP RS

2.4

PromoterAI

-0.017

Neutral

(source)

Varity_R

0.071

gMVP

0.31

Mutation Taster

=91/9

polymorphism

(source)

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over