rs794728187
Variant summary
Our verdict is Pathogenic. Variant got 15 ACMG points: 15P and 0B. PS1_ModeratePM1PM2PM5PP2PP3_StrongPP5_Moderate
The NM_000138.5(FBN1):c.2201G>T(p.Cys734Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 11/18 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in UniProt. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C734Y) has been classified as Likely pathogenic.
Frequency
Genomes: not found (cov: 33)
Consequence
FBN1
NM_000138.5 missense
NM_000138.5 missense
Scores
15
1
1
Clinical Significance
Conservation
PhyloP100: 7.57
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 15 ACMG points.
PS1
Transcript NM_000138.5 (FBN1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
PM1
In a domain EGF-like 11; calcium-binding (size 41) in uniprot entity FBN1_HUMAN there are 13 pathogenic changes around while only 2 benign (87%) in NM_000138.5
PM2
Very rare variant in population databases, with high coverage;
PM5
Other missense variant is known to change same aminoacid residue: Variant chr15-48497358-C-T is described in Lovd as [Likely_pathogenic].
PP2
Missense variant in gene, where missense usually causes diseases (based on misZ statistic), FBN1. . Gene score misZ: 5.0644 (greater than the threshold 3.09). Trascript score misZ: 8.1787 (greater than threshold 3.09). The gene has 1311 curated pathogenic missense variants (we use a threshold of 10). The gene has 112 curated benign missense variants. GenCC has associacion of the gene with MASS syndrome, Weill-Marchesani syndrome, geleophysic dysplasia, Shprintzen-Goldberg syndrome, Acromicric dysplasia, familial thoracic aortic aneurysm and aortic dissection, progeroid and marfanoid aspect-lipodystrophy syndrome, ectopia lentis 1, isolated, autosomal dominant, Marfan syndrome, Weill-Marchesani syndrome 2, dominant, isolated ectopia lentis, neonatal Marfan syndrome, stiff skin syndrome.
PP3
MetaRNN computational evidence supports a deleterious effect, 0.996
PP5
Variant 15-48497358-C-A is Pathogenic according to our data. Variant chr15-48497358-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 199992.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr15-48497358-C-A is described in Lovd as [Likely_pathogenic].
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes
GnomAD3 genomes
Cov.:
33
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome
GnomAD4 genome
Cov.:
33
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
not provided Pathogenic:1
| Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | May 21, 2014 | p.Cys734Phe (TGC>TTC): c.2201 G>T in exon 19 of the FBN1 gene (NM_000138.4)The C734F mutation in the FBN1 gene has been reported previously in a patient with Marfan syndrome, however no segregation or population data were reported (Katzke S et al., 2002). In addition, the C734F mutation was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. Moreover, C734F results in a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is completely conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. Furthermore, mutations in nearby residues (E726G, C727Y, G737V, C739R) have been reported in association with Marfan syndrome and ectopia lentis, further supporting the functional importance of this region of the protein.In summary, C734F in the FBN1 gene is interpreted as a disease-causing mutation. The variant is found in TAAD panel(s). - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
LIST_S2
Pathogenic
D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D
MetaSVM
Pathogenic
D
PrimateAI
Pathogenic
D
PROVEAN
Pathogenic
D
REVEL
Pathogenic
Sift
Pathogenic
D
Sift4G
Pathogenic
D
Vest4
MutPred
Loss of disorder (P = 0.0622);
MVP
MPC
ClinPred
D
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