rs794728228

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

Scores

3
3
1

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:9

Conservation

PhyloP100: 6.79
Variant links:
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]

Genome browser will be placed here

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
FBN1NM_000138.5 linkuse as main transcriptc.4621C>T p.Arg1541Ter stop_gained 38/66 ENST00000316623.10 NP_000129.3
FBN1NM_001406716.1 linkuse as main transcriptc.4621C>T p.Arg1541Ter stop_gained 37/65 NP_001393645.1

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
FBN1ENST00000316623.10 linkuse as main transcriptc.4621C>T p.Arg1541Ter stop_gained 38/661 NM_000138.5 ENSP00000325527 P1

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD4 exome
AF:
0.00000137
AC:
2
AN:
1461852
Hom.:
0
Cov.:
32
AF XY:
0.00000138
AC XY:
1
AN XY:
727222
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.00000180
Gnomad4 OTH exome
AF:
0.00
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 providedclinical testingCenter for Medical Genetics Ghent, University of GhentNov 07, 2017- -
Pathogenic, criteria provided, single submitterclinical testingCenter for Genomics, Ann and Robert H. Lurie Children's Hospital of ChicagoAug 01, 2017FBN1 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 submitterresearchCentre of Medical Genetics, University of AntwerpMar 01, 2021PM2, PVS1, PP4 -
Familial thoracic aortic aneurysm and aortic dissection Pathogenic:2
Pathogenic, criteria provided, single submitterclinical testingCHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern OntarioFeb 26, 2019- -
Pathogenic, criteria provided, single submitterclinical testingAmbry GeneticsOct 13, 2016The 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 submitterclinical testingBlueprint GeneticsSep 14, 2018- -
Pathogenic, criteria provided, single submitterclinical testingGeneDxMay 13, 2022Nonsense 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 submitterclinical testingWomen's Health and Genetics/Laboratory Corporation of America, LabCorpJan 20, 2017Variant 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 submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpJan 05, 2024This 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: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
0.63
D
BayesDel_noAF
Pathogenic
0.62
CADD
Pathogenic
44
DANN
Uncertain
1.0
Eigen
Uncertain
0.57
Eigen_PC
Uncertain
0.42
FATHMM_MKL
Pathogenic
0.99
D
MutationTaster
Benign
1.0
A
Vest4
0.97
GERP RS
3.2

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

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs794728228; hg19: chr15-48760261; API