rs794728228
Positions:
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The ENST00000316623.10(FBN1):c.4621C>T(p.Arg1541Ter) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000137 in 1,461,852 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 (★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000014 ( 0 hom. )
Consequence
FBN1
ENST00000316623.10 stop_gained
ENST00000316623.10 stop_gained
Scores
3
3
1
Clinical Significance
Conservation
PhyloP100: 6.79
Genes affected
FBN1 (HGNC:3603): (fibrillin 1) This gene encodes a member of the fibrillin family of proteins. The encoded preproprotein is proteolytically processed to generate two proteins including the extracellular matrix component fibrillin-1 and the protein hormone asprosin. Fibrillin-1 is an extracellular matrix glycoprotein that serves as a structural component of calcium-binding microfibrils. These microfibrils provide force-bearing structural support in elastic and nonelastic connective tissue throughout the body. Asprosin, secreted by white adipose tissue, has been shown to regulate glucose homeostasis. Mutations in this gene are associated with Marfan syndrome and the related MASS phenotype, as well as ectopia lentis syndrome, Weill-Marchesani syndrome, Shprintzen-Goldberg syndrome and neonatal progeroid syndrome. [provided by RefSeq, Apr 2016]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 15-48468064-G-A is Pathogenic according to our data. Variant chr15-48468064-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 200052.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr15-48468064-G-A is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
FBN1 | NM_000138.5 | c.4621C>T | p.Arg1541Ter | stop_gained | 38/66 | ENST00000316623.10 | NP_000129.3 | |
FBN1 | NM_001406716.1 | c.4621C>T | p.Arg1541Ter | stop_gained | 37/65 | NP_001393645.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
FBN1 | ENST00000316623.10 | c.4621C>T | p.Arg1541Ter | stop_gained | 38/66 | 1 | NM_000138.5 | ENSP00000325527 | P1 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461852Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1AN XY: 727222
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1461852
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32
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727222
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GnomAD4 genome Cov.: 32
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:9
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Marfan syndrome Pathogenic:3
Pathogenic, no assertion criteria provided | clinical testing | Center for Medical Genetics Ghent, University of Ghent | Nov 07, 2017 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago | Aug 01, 2017 | FBN1 NM_000138.4 exon38 p.Arg1541* (c.4621C>T): This variant has been reported in at least 7 individuals with a clinical diagnosis or suspicion of Marfan syndrome, segregating with disease in >10 affected relatives (Halliday 1999 PMID:10647894, Loeys 2001 PMID:11700157, Halliday 2002 PMID:12161601, Matyas 2002 PMID:11933199, Behan 2003 PMID:12700307, Arbustini 2005 PMID:16222657). This variant is not present in large population studies. This variant is predicted to cause a stopgain at this codon, resulting in protein truncation or loss of allelic expression through nonsense-mediated mRNA decay. Loss of function variants are a known mechanism of disease for this gene (Dietz, PMID: 20301510). In summary, this variant is classified as pathogenic based on the data above (several probands with variant and disease, segregation studies absence from controls, impact to protein). - |
Pathogenic, criteria provided, single submitter | research | Centre of Medical Genetics, University of Antwerp | Mar 01, 2021 | PM2, PVS1, PP4 - |
Familial thoracic aortic aneurysm and aortic dissection Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario | Feb 26, 2019 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Oct 13, 2016 | The p.R1541* pathogenic mutation (also known as c.4621C>T), located in coding exon 37 of the FBN1 gene, results from a C to T substitution at nucleotide position 4621. This changes the amino acid from an arginine to a stop codon within coding exon 37. This alteration has been found to result in reduced levels of fibrillin-1 (Halliday D et al. Hum. Genet., 1999 Dec;105:587-97). Multiple studies have identified the alteration in patients with a diagnosis of Marfan syndrome or Marfan-related symptoms (Loeys B et al. Arch. Intern. Med., 2001 Nov;161:2447-54; Arbustini E et al. Hum. Mutat., 2005 Nov;26:494; Behan WM et al. J. Neurol. Neurosurg. Psychiatr., 2003 May;74:633-8). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. - |
not provided Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Blueprint Genetics | Sep 14, 2018 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | May 13, 2022 | Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 11933199, 19012347, 12915484, 31536524, 30341550, 31098894, 25525159, 16220557, 18435798, 19618372, 21542060, 11700157, 12068374, 22913777, 17657824, 10647894, 23684891, 16222657, 12161601, 12700307, 25101912, 28973303, 34921932) - |
Marfan Syndrome/Loeys-Dietz Syndrome/Familial Thoracic Aortic Aneurysms and Dissections Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Jan 20, 2017 | Variant summary: The FBN1 c.4621C>T (p.Arg1541X) variant results in a premature termination codon, predicted to cause a truncated or absent FBN1 protein due to nonsense mediated decay, which are commonly known mechanisms for disease. One in silico tool predicts a damaging outcome for this variant. This variant is absent in 121346 control chromosomes and has been reported in numerous affected individuals in the literature. In addition, multiple clinical diagnostic laboratories/reputable databases classified this variant as pathogenic. Taken together, this variant is classified as pathogenic. - |
Marfan syndrome;C4707243:Familial thoracic aortic aneurysm and aortic dissection Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 05, 2024 | This sequence change creates a premature translational stop signal (p.Arg1541*) in the FBN1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in FBN1 are known to be pathogenic (PMID: 17657824, 19293843). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individuals with Marfan syndrome (PMID: 10647894, 11933199, 12161601, 12700307, 16222657, 17657824, 23684891). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 200052). For these reasons, this variant has been classified as Pathogenic. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
MutationTaster
Benign
A
Vest4
GERP RS
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at