rs764224168

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1PP2PP3

The NM_000138.5(FBN1):c.370A>G(p.Met124Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000372 in 1,613,766 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M124I) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

FBN1
NM_000138.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 5.96

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]

FBN1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM1

In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 10 uncertain in NM_000138.5

PP2

Missense variant where missense usually causes diseases, FBN1

PP3

MetaRNN computational evidence supports a deleterious effect, 0.831

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
FBN1	NM_000138.5 linkuse as main transcript	c.370A>G	p.Met124Val	missense_variant	5/66	ENST00000316623.10
FBN1	NM_001406716.1 linkuse as main transcript	c.370A>G	p.Met124Val	missense_variant	4/65
FBN1	NM_001406717.1 linkuse as main transcript	c.370A>G	p.Met124Val	missense_variant	5/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
FBN1	ENST00000316623.10 linkuse as main transcript	c.370A>G	p.Met124Val	missense_variant	5/66	1	NM_000138.5	P1
FBN1	ENST00000559133.6 linkuse as main transcript	c.370A>G	p.Met124Val	missense_variant, NMD_transcript_variant	5/67	1
FBN1	ENST00000674301.2 linkuse as main transcript	c.370A>G	p.Met124Val	missense_variant, NMD_transcript_variant	5/68
FBN1	ENST00000537463.6 linkuse as main transcript	c.370A>G	p.Met124Val	missense_variant, NMD_transcript_variant	5/31	5

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

250938

Hom.:

AF XY:

0.00000738

AC XY:

AN XY:

135582

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000883

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1461634

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727144

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000671

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

AF:

0.00000657

AC:

AN:

152132

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74308

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000896

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jul 26, 2016

Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: Reported in 1 Marfan proband and an additional individual who died suddently (thesis in spanish - https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=10&cad=rja&uact=8&ved=0ahUKEwiErr6GwYfMAhWluoMKHUGVA0sQFghCMAk&url=http%3A%2F%2Frua.ua.es%2Fdspace%2Fbitstream%2F10045%2F47409%2F1%2Ftesis_sonia_santillan_garzon.pdf&usg=AFQjCNFIEBTg3Y7AD4w_s01zJG7D0gJDdQ&sig2=BpN6DJWBcJGCzKnmEEVyGQ&bvm=bv.119028448,d.d2s) -

Marfan syndrome;C4707243:Familial thoracic aortic aneurysm and aortic dissection

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 13, 2021

This sequence change replaces methionine with valine at codon 124 of the FBN1 protein (p.Met124Val). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and valine. This variant is present in population databases (rs764224168, ExAC 0.009%). This missense change has been observed in individual(s) with Marfan syndrome (PMID: 21932315). ClinVar contains an entry for this variant (Variation ID: 402851). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.40

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Pathogenic

0.28

Cadd

Benign

Dann

Uncertain

0.97

Eigen

Uncertain

0.66

Eigen_PC

Pathogenic

0.69

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.78

M_CAP

Uncertain

0.16

MetaRNN

Pathogenic

0.83

MetaSVM

Uncertain

0.14

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.75

PROVEAN

Uncertain

-2.8

REVEL

Uncertain

0.54

Sift

Benign

0.030

Sift4G

Uncertain

0.039

Vest4

0.89

MutPred

0.49

Loss of disorder (P = 0.2303);

MVP

0.96

MPC

1.3

ClinPred

0.51

GERP RS

6.2

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over