rs28939073

Positions:

chr14-91877621-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2PP3_ModerateBS1_Supporting

The ENST00000342058.9(FBLN5):c.1051C>T(p.Arg351Trp) variant causes a missense change. The variant allele was found at a frequency of 0.0000812 in 1,613,952 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. R351Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000078 ( 0 hom. )

Consequence

FBLN5
ENST00000342058.9 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts P:1U:9

Conservation

PhyloP100: 4.80

Variant links:

Genes affected

FBLN5 (HGNC:3602): (fibulin 5) The protein encoded by this gene is a secreted, extracellular matrix protein containing an Arg-Gly-Asp (RGD) motif and calcium-binding EGF-like domains. It promotes adhesion of endothelial cells through interaction of integrins and the RGD motif. It is prominently expressed in developing arteries but less so in adult vessels. However, its expression is reinduced in balloon-injured vessels and atherosclerotic lesions, notably in intimal vascular smooth muscle cells and endothelial cells. Therefore, the protein encoded by this gene may play a role in vascular development and remodeling. Defects in this gene are a cause of autosomal dominant cutis laxa, autosomal recessive cutis laxa type I (CL type I), and age-related macular degeneration type 3 (ARMD3). [provided by RefSeq, Jul 2008]

FBLN5 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.844

BS1

Variant frequency is greater than expected in population amr. gnomad4_exome allele frequency = 0.000078 (114/1461800) while in subpopulation AMR AF= 0.000313 (14/44724). AF 95% confidence interval is 0.000189. There are 0 homozygotes in gnomad4_exome. There are 50 alleles in male gnomad4_exome subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FBLN5	NM_006329.4 linkuse as main transcript	c.1051C>T	p.Arg351Trp	missense_variant	10/11	ENST00000342058.9	NP_006320.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FBLN5	ENST00000342058.9 linkuse as main transcript	c.1051C>T	p.Arg351Trp	missense_variant	10/11	1	NM_006329.4	ENSP00000345008	P1

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152152

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

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:

0.000176

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000756

AC:

AN:

251396

Hom.:

AF XY:

0.0000515

AC XY:

AN XY:

135860

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000289

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:

0.0000704

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000780

AC:

114

AN:

1461800

Hom.:

Cov.:

AF XY:

0.0000688

AC XY:

AN XY:

727204

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000313

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.0000827

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.000112

AC:

AN:

152152

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74340

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000327

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000176

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000739

Hom.:

Bravo

AF:

0.000147

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.0000659

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Macular degeneration, age-related, 3

Pathogenic:1Uncertain:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Jul 22, 2004	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 27, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Aug 18, 2021	Identified in a patient with age-related macular degeneration in the published literature (Stone et al., 2004) Functional data suggests that R351W indicates increased self-association of the dimers (Jones et al., 2010), though additional studies are need to elucidate the pathogenicity of R351W In silico analysis supports that this missense variant has a deleterious effect on protein structure/function Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 5481; Landrum et al., 2016) This variant is associated with the following publications: (PMID: 20007835, 15269314, 21576112) -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 12, 2023	This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 351 of the FBLN5 protein (p.Arg351Trp). This variant is present in population databases (rs28939073, gnomAD 0.03%). This missense change has been observed in individual(s) with age-related macular degeneration (PMID: 15269314). ClinVar contains an entry for this variant (Variation ID: 5481). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt FBLN5 protein function with a negative predictive value of 80%. Experimental studies have shown that this missense change does not substantially affect FBLN5 function (PMID: 16652333). 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. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Jul 12, 2024

Variant summary: FBLN5 c.1051C>T (p.Arg351Trp) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 7.6e-05 in 251396 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in FBLN5 causing FBLN5-Related Disorders, allowing no conclusion about variant significance. c.1051C>T has been reported in the literature in individuals affected with FBLN5-Related Disorders (Stone_2004, Wasowska_2023). These data indicate that the variant may be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function, however, does not allow convincing conclusions about the variant effect (Jones_2010, Lotery_2007). The following publications have been ascertained in the context of this evaluation (PMID: 20007835, 16652333, 15269314, 37761846). ClinVar contains an entry for this variant (Variation ID: 5481). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

See cases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Apr 22, 2019

ACMG classification criteria: PM2, PP3 -

Cutis laxa

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Age-related macular degeneration

Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

Inherited Neuropathy Consortium Ii, University Of Miami

Jan 06, 2016

- -

Macular degeneration, age-related, 3;C3280794:Cutis laxa, autosomal dominant 2;C5676926:Charcot-Marie-Tooth disease, demyelinating, IIA 1H;C5848058:Cutis laxa, autosomal recessive, type 1A

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 15, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.91

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Pathogenic

0.33

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.28

T;D;T

Eigen

Pathogenic

0.84

Eigen_PC

Pathogenic

0.82

FATHMM_MKL

Uncertain

0.79

LIST_S2

Pathogenic

0.98

D;D;D

M_CAP

Benign

0.059

MetaRNN

Pathogenic

0.84

D;D;D

MetaSVM

Uncertain

0.58

MutationAssessor

Benign

2.0

.;M;.

MutationTaster

Benign

1.0

A;A;A

PrimateAI

Uncertain

0.76

PROVEAN

Pathogenic

-5.0

D;D;D

REVEL

Pathogenic

0.71

Sift

Uncertain

0.0020

D;D;D

Sift4G

Uncertain

0.0050

D;D;D

Polyphen

1.0

D;D;D

Vest4

0.92

MVP

0.95

MPC

1.2

ClinPred

0.73

GERP RS

5.2

Varity_R

0.70

gMVP

0.72

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