rs1555152518

chr12-51913299-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM1 PM2 PP2 BP4

The NM_000020.3(ACVRL1):c.262T>G(p.Tyr88Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 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. Y88C) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ACVRL1 NM_000020.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.773

Genes affected

ACVRL1 (HGNC:175): (activin A receptor like type 1) This gene encodes a type I cell-surface receptor for the TGF-beta superfamily of ligands. It shares with other type I receptors a high degree of similarity in serine-threonine kinase subdomains, a glycine- and serine-rich region (called the GS domain) preceding the kinase domain, and a short C-terminal tail. The encoded protein, sometimes termed ALK1, shares similar domain structures with other closely related ALK or activin receptor-like kinase proteins that form a subfamily of receptor serine/threonine kinases. Mutations in this gene are associated with hemorrhagic telangiectasia type 2, also known as Rendu-Osler-Weber syndrome 2. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_000020.3
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, ACVRL1
• BP4: Computational evidence support a benign effect (MetaRNN=0.3614061).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACVRL1	NM_000020.3	c.262T>G	p.Tyr88Asp	missense_variant	3/10	ENST00000388922.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACVRL1	ENST00000388922.9	c.262T>G	p.Tyr88Asp	missense_variant	3/10	1	NM_000020.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Lip telangiectasia;C3809715:Spontaneous, recurrent epistaxis;C4022018:Telangiectasia of the skin;C4025877:Oral cavity telangiectasia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Jan 01, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Uncertain	0.087	D
BayesDel_noAF	Benign	-0.11
Cadd	Benign	16
Dann	Benign	0.79
Eigen	Benign	-0.73
Eigen_PC	Benign	-0.61
FATHMM_MKL	Benign	0.75	D
LIST_S2	Benign	0.60	T;T;T;T
M_CAP	Uncertain	0.25	D
MetaRNN	Benign	0.36	T;T;T;T
MetaSVM	Benign	-0.31	T
MutationTaster	Benign	1.0	D;N;N
PrimateAI	Benign	0.38	T
PROVEAN	Pathogenic	-5.1	D;N;N;N
Sift	Uncertain	0.015	D;T;D;T
Sift4G	Benign	0.13	T;T;T;T
Polyphen		0.022	.;B;.;.
Vest4		0.50, 0.53
MutPred		0.64		Gain of disorder (P = 0.0059);Gain of disorder (P = 0.0059);.;.;
MVP		0.89
MPC		1.1
ClinPred		0.19	T
GERP RS		2.1
Varity_R		0.20
gMVP		0.93

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1555152518; hg19: chr12-52307083;