rs1057517944
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Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000020.3(ACVRL1):c.1435C>T(p.Arg479Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,804 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).
Frequency
Genomes: not found (cov: 31)
Exomes 𝑓: 0.0000021 ( 0 hom. )
Consequence
ACVRL1
NM_000020.3 stop_gained
NM_000020.3 stop_gained
Scores
2
2
3
Clinical Significance
Conservation
PhyloP100: 0.537
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]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
?
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 23 pathogenic variants in the truncated region.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 12-51920816-C-T is Pathogenic according to our data. Variant chr12-51920816-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 372722.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-51920816-C-T is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
ACVRL1 | NM_000020.3 | c.1435C>T | p.Arg479Ter | stop_gained | 10/10 | ENST00000388922.9 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
ACVRL1 | ENST00000388922.9 | c.1435C>T | p.Arg479Ter | stop_gained | 10/10 | 1 | NM_000020.3 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 31
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GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251420Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135898
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GnomAD4 exome AF: 0.00000205 AC: 3AN: 1461804Hom.: 0 Cov.: 35 AF XY: 0.00000275 AC XY: 2AN XY: 727204
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GnomAD4 genome ? Cov.: 31
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ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:11
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Telangiectasia, hereditary hemorrhagic, type 2 Pathogenic:5
Pathogenic, criteria provided, single submitter | research | NIHR Bioresource Rare Diseases, University of Cambridge | Jan 01, 2018 | PVS1+PM2+PP4 - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Dec 01, 2023 | This sequence change creates a premature translational stop signal (p.Arg479*) in the ACVRL1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 25 amino acid(s) of the ACVRL1 protein. This variant is present in population databases (no rsID available, gnomAD 0.003%). This premature translational stop signal has been observed in individuals with hereditary hemorrhagic telangiectasia (HHT) (PMID: 15024723, 15065824, 15517393, 15712271, 16429404, 16540754, 18673552, 21158752, 23722869). ClinVar contains an entry for this variant (Variation ID: 372722). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. This variant disrupts the p.Arg479 amino acid residue in ACVRL1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 16470787, 16705692, 20501893, 21158752). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories | Sep 29, 2023 | The ACVRL1 c.1435C>T; p.Arg479Ter variant (rs1057517944) is reported in the literature in multiple individuals affected with hereditary hemorrhagic telangiectasia (HHT; Abdalla 2004 and 2005, Canzonieri 2014, Chen 2013, Fontalba 2008, Gedge 2007, Komiyama 2014, Lenato 2006, Lesca 2004, Letterboer 2005, Olivieri 2006, Yan 2006). This variant is reported in ClinVar (Variation ID: 372722), and is only observed on one allele in the Genome Aggregation Database, indicating it is not a common polymorphism. This variant results in a premature termination codon in the last exon of the ACVRL1 gene. While this may not lead to nonsense-mediated decay, it is expected to create a truncated protein, and functional analyses of the variant protein demonstrate a loss of ligand-induced receptor signaling and down-regulation of the protein (Garamszeg 2001). Additionally, another downstream truncating variant, c.1468C>T; p.Gln490Ter, has been reported in multiple patients with HHT (Girerd 2010, Machado 2015, Trembath 2001) and is considered pathogenic. Based on available information, the c.1435C>T; p.Arg479Ter variant is considered to be pathogenic. REFERENCES Abdalla SA et al. Primary pulmonary hypertension in families with hereditary haemorrhagic telangiectasia. Eur Respir J. 2004 Mar;23(3):373-7. PMID: 15065824. Abdalla SA et al. Novel mutations and polymorphisms in genes causing hereditary hemorrhagic telangiectasia. Hum Mutat. 2005 Mar;25(3):320-1. PMID: 15712271. Canzonieri C et al. Endoscopic evaluation of gastrointestinal tract in patients with hereditary hemorrhagic telangiectasia and correlation with their genotypes. Genet Med. 2014 Jan;16(1):3-10. PMID: 23722869. Chen YJ et al. Clinical and genetic characteristics of Chinese patients with hereditary haemorrhagic telangiectasia-associated pulmonary hypertension. Eur J Clin Invest. 2013 Oct;43(10):1016-24. PMID: 23919827. Fontalba A et al. Mutation study of Spanish patients with hereditary hemorrhagic telangiectasia. BMC Med Genet. 2008 Aug 1;9:75. PMID: 18673552. Garamszegi N et al. Transforming growth factor beta receptor signaling and endocytosis are linked through a COOH terminal activation motif in the type I receptor. Mol Biol Cell. 2001 Sep;12(9):2881-93. PMID: 11553725. Gedge F et al. Clinical and analytical sensitivities in hereditary hemorrhagic telangiectasia testing and a report of de novo mutations. J Mol Diagn. 2007 Apr;9(2):258-65. PMID: 17384219. Girerd B et al. Clinical outcomes of pulmonary arterial hypertension in patients carrying an ACVRL1 (ALK1) mutation. Am J Respir Crit Care Med. 2010 Apr 15;181(8):851-61. PMID: 20056902. Komiyama M et al. Hereditary hemorrhagic telangiectasia in Japanese patients. J Hum Genet. 2014 Jan;59(1):37-41. PMID: 24196379. Lenato GM et al. DHPLC-based mutation analysis of ENG and ALK-1 genes in HHT Italian population. Hum Mutat. 2006 Feb;27(2):213-4. PMID: 16429404. Lesca G et al. Molecular screening of ALK1/ACVRL1 and ENG genes in hereditary hemorrhagic telangiectasia in France. Hum Mutat. 2004 Apr;23(4):289-99. PMID: 15024723. Letterboer TG et al. Hereditary hemorrhagic telangiectasia: ENG and ALK-1 mutations in Dutch patients. Hum Genet. 2005 Jan;116(1-2):8-16. PMID: 15517393. Machado RD et al. Pulmonary Arterial Hypertension: A Current Perspective on Established and Emerging Molecular Genetic Defects. Hum Mutat. 2015 Dec;36(12):1113-27. PMID: 26387786. Olivieri C et al. Echocardiographic screening discloses increased values of pulmonary artery systolic pressure in 9 of 68 unselected patients affected with hereditary hemorrhagic telangiectasia. Genet Med. 2006 Mar;8(3):183-90. PMID: 16540754. Trembath RC et al. Clinical and molecular genetic features of pulmonary hypertension in patients with hereditary hemorrhagic telangiectasia. N Engl J Med. 2001 Aug 2;345(5):325-34. PMID: 11484689. Yan ZM et al. A novel mutation in ALK-1 causes hereditary hemorrhagic telangiectasia type 2. J Dent Res. 2006 Aug;85(8):705-10. PMID: 16861286. - |
Pathogenic, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | May 06, 2022 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Victorian Clinical Genetics Services, Murdoch Childrens Research Institute | May 06, 2021 | Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Pathogenic. Following criteria are met: 0103 - Dominant negative and loss of function are known mechanisms of disease in this gene and are associated with hereditary haemorrhagic telangiectasia type 2 (MIM#600376) (PMID: 16282348, PMID: 26176610). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0115 - Variants in this gene are known to have variable expressivity. Clinical expression is extremely variable and age-dependent (PMID: 19767588). (I) 0205 - Variant is predicted to result in a truncated protein (premature termination codon is NOT located at least 54 nucleotides upstream of the final exon-exon junction) with less than 1/3 of the protein sequence affected. (SP) 0251 - This variant is heterozygous. (I) 0302 - Variant is present in gnomAD (v2) <0.001 for a dominant condition (1 heterozygote). (SP) 0702 - Truncating variants comparable to the one identified in this case have strong previous evidence for pathogenicity. Other protein truncating variants have previously been reported as pathogenic in individuals with hereditary haemorrhagic telangiectasia type 2 (ClinVar). (SP) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals.This variant has previously been reported in individuals with hereditary haemorrhagic telangiectasia (ClinVar). (SP) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign - |
not provided Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Mar 10, 2022 | Nonsense variant in the C-terminus predicted to result in protein truncation as the last 25 amino acids are lost, and other loss-of-function variants have been reported downstream in HGMD; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 21158752, 16429404, 26387786, 23722869, 15024723, 17384219, 16540754, 24196379, 16861286, 18673552, 15517393, 15065824, 15712271, 15266205, 17786384, 23919827, 29631995, 30578397, 31220907, 32503579, 32300199) - |
Pathogenic, criteria provided, single submitter | clinical testing | Mayo Clinic Laboratories, Mayo Clinic | Mar 30, 2022 | PP1_strong, PM2_supporting, PS4, PVS1_moderate - |
Pulmonary arterial hypertension related to hereditary hemorrhagic telangiectasia Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | Rare Disease Genomics Group, St George's University of London | - | - - |
Telangiectasia, hereditary hemorrhagic, type 1 Pathogenic:1
Likely pathogenic, no assertion criteria provided | clinical testing | Genetics, Medical University of Vienna | - | - - |
Cardiovascular phenotype Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Feb 16, 2019 | The p.R479* pathogenic mutation (also known as c.1435C>T) is located in coding exon 9 of the ACVRL1 gene. This changes the amino acid from an arginine to a stop codon within coding exon 9. This stop codon occurs at the 3' terminus of ACVRL1, impacts the last twenty-five amino acids of the protein, and may not trigger nonsense-mediated mRNA decay. This mutation has been detected in multiple individuals from hereditary hemorrhagic telangiectasia (HHT) cohorts (Lesca et al. Hum Mutat. 2004;23:289-299; Gedge F et al. J Mol Diagn. 2007 Apr;9(2):258-65; Canzonieri C et al. Genet Med. 2014 Jan;16(1):3-10; Komiyama M et al. J Hum Genet. 2014 Jan;59(1):37-41). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation. As such, this alteration is interpreted as a disease-causing mutation. - |
Hereditary hemorrhagic telangiectasia Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Molecular Genetics, Royal Melbourne Hospital | Jul 07, 2023 | This sequence change in ACVRL1 is a nonsense variant predicted to cause a premature stop codon, p.(Arg479*), in biologically relevant exon 10/10, that is predicted to escape nonsense-mediated decay and remove <10% of the protein, however, it is a truncation of a functionally important region (removes 25 amino acids) in a gene where loss-of-function is an established disease mechanism. The highest population minor allele frequency in the population database gnomAD v2.1 is 0.003% (1/34,588 alleles) in the Latino/Admixed American population. This variant has been reported in multiple individuals with a clinical diagnosis of hereditary haemorrhagic telangiectasia, and segregates with disease in multiple families (PMID: 15024723, 16540754, 15065824, 16861286). Based on the classification scheme RMH Modified ACMG/AMP Guidelines v1.6.1, this variant is classified as PATHOGENIC. Following criteria are met: PVS1_Strong, PM2_Supporting, PP1_Strong, PS4 - |
Computational scores
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Calibrated prediction
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BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Uncertain
Eigen_PC
Benign
FATHMM_MKL
Benign
D
MutationTaster
Benign
D;D;D
Vest4
GERP RS
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at