chr8-107251875-T-C

Variant names:

• chr8-107251875-T-C
• NM_001146.5:c.1477A>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001146.5(ANGPT1):​c.1477A>G​(p.Ile493Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,626 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: ANGPT1 NM_001146.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.26
• Publications: 0 publications found

Genes affected

ANGPT1 (HGNC:484): (angiopoietin 1) This gene encodes a secreted glycoprotein that belongs to the angiopoietin family. Members of this family play important roles in vascular development and angiogenesis. All angiopoietins bind with similar affinity to an endothelial cell-specific tyrosine-protein kinase receptor. The protein encoded by this gene is a secreted glycoprotein that activates the receptor by inducing its tyrosine phosphorylation. It plays a critical role in mediating reciprocal interactions between the endothelium and surrounding matrix and mesenchyme and inhibits endothelial permeability. The protein also contributes to blood vessel maturation and stability, and may be involved in early development of the heart. Mutations in this gene are associated with hereditary angioedema. [provided by RefSeq, Aug 2020]

ANGPT1 Gene-Disease associations (from GenCC):

• glaucoma

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• primary congenital glaucoma

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• angioedema, hereditary, 5

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37268847).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ANGPT1	NM_001146.5	c.1477A>G	p.Ile493Val	missense_variant	Exon 9 of 9	ENST00000517746.6	NP_001137.2
ANGPT1	NM_001199859.3	c.1474A>G	p.Ile492Val	missense_variant	Exon 9 of 9		NP_001186788.1
ANGPT1	NM_001314051.2	c.877A>G	p.Ile293Val	missense_variant	Exon 8 of 8		NP_001300980.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ANGPT1	ENST00000517746.6	c.1477A>G	p.Ile493Val	missense_variant	Exon 9 of 9	1	NM_001146.5	ENSP00000428340.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461626 Hom.: 0 Cov.: 30 AF XY: 0.00000413 AC XY: 3 AN XY: 727106

African (AFR) AF: 0.00 AC: 0 AN: 33458

American (AMR) AF: 0.00 AC: 0 AN: 44710

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26122

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86228

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.000173 AC: 1 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111834

Other (OTH) AF: 0.0000331 AC: 2 AN: 60390

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Apr 14, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 493 of the ANGPT1 protein (p.Ile493Val). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with ANGPT1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1934887). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.18	T;.;.;T
Eigen	Benign	0.070
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.85	T;D;D;T
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.37	T;T;T;T
MetaSVM	Benign	-0.57	T
MutationAssessor	Benign	1.4	L;.;.;.
PhyloP100		6.3
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-0.50	N;N;N;N
REVEL	Uncertain	0.33
Sift	Benign	0.20	T;T;T;T
Sift4G	Benign	0.19	T;T;T;T
Polyphen		0.0020	B;.;.;.
Vest4		0.35
MutPred		0.66		Loss of catalytic residue at P495 (P = 0.0274);.;.;.;
MVP		0.86
MPC		1.0
ClinPred		0.80	D
GERP RS		5.9
Varity_R		0.26
Mutation Taster		=40/60	disease causing

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

hg19: chr8-108264103;