rs28763925

Positions:

Variant summary

Our verdict is Benign. Variant got -17 ACMG points: 1P and 18B. PP2BP4_ModerateBP6_Very_StrongBS1BS2

The NM_001999.4(FBN2):c.7418G>T(p.Arg2473Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000376 in 1,614,066 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00030 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00038 ( 1 hom. )

Consequence

FBN2
NM_001999.4 missense

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 3.42

Variant links:

Genes affected

FBN2 (HGNC:3604): (fibrillin 2) The protein encoded by this gene is a component of connective tissue microfibrils and may be involved in elastic fiber assembly. Mutations in this gene cause congenital contractural arachnodactyly. [provided by RefSeq, Jul 2008]

FBN2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -17 ACMG points.

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), FBN2. . Gene score misZ 1.5491 (greater than the threshold 3.09). Trascript score misZ 3.2752 (greater than threshold 3.09). GenCC has associacion of gene with familial thoracic aortic aneurysm and aortic dissection, carpal tunnel syndrome, macular degeneration, early-onset, congenital contractural arachnodactyly.

BP4

Computational evidence support a benign effect (MetaRNN=0.19141698).

BP6

Variant 5-128277933-C-A is Benign according to our data. Variant chr5-128277933-C-A is described in ClinVar as [Likely_benign]. Clinvar id is 213427.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-128277933-C-A is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.000384 (561/1461808) while in subpopulation NFE AF= 0.000351 (390/1111958). AF 95% confidence interval is 0.000322. There are 1 homozygotes in gnomad4_exome. There are 266 alleles in male gnomad4_exome subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 46 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FBN2	NM_001999.4 linkuse as main transcript	c.7418G>T	p.Arg2473Leu	missense_variant	58/65	ENST00000262464.9	NP_001990.2
FBN2	XM_017009228.3 linkuse as main transcript	c.7265G>T	p.Arg2422Leu	missense_variant	57/64		XP_016864717.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FBN2	ENST00000262464.9 linkuse as main transcript	c.7418G>T	p.Arg2473Leu	missense_variant	58/65	1	NM_001999.4	ENSP00000262464	P1	P35556-1
FBN2	ENST00000703783.1 linkuse as main transcript	n.4202G>T		non_coding_transcript_exon_variant	33/38

Frequencies

GnomAD3 genomes

AF:

0.000302

AC:

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.00236

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000279

Gnomad OTH

AF:

0.000479

GnomAD3 exomes

AF:

0.000426

AC:

107

AN:

251156

Hom.:

AF XY:

0.000405

AC XY:

AN XY:

135710

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00323

Gnomad NFE exome

AF:

0.000308

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000384

AC:

561

AN:

1461808

Hom.:

Cov.:

AF XY:

0.000366

AC XY:

266

AN XY:

727208

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00281

Gnomad4 NFE exome

AF:

0.000351

Gnomad4 OTH exome

AF:

0.000331

GnomAD4 genome

AF:

0.000302

AC:

AN:

152258

Hom.:

Cov.:

AF XY:

0.000363

AC XY:

AN XY:

74448

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00236

Gnomad4 NFE

AF:

0.000279

Gnomad4 OTH

AF:

0.000474

Alfa

AF:

0.000242

Hom.:

Bravo

AF:

0.000147

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000338

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000296

ClinVar

Significance: Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Congenital contractural arachnodactyly

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jun 14, 2016	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 04, 2024	- -

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

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

Dec 18, 2023

Variant summary: FBN2 c.7418G>T (p.Arg2473Leu) results in a non-conservative amino acid change located in the EGF-like domain (IPR000742) of the encoded protein sequence. Four of four in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00043 in 251156 control chromosomes. The observed variant frequency is approximately 340-fold of the estimated maximal expected allele frequency for a pathogenic variant in FBN2 causing Aortopathy phenotype (1.3e-06), strongly suggesting that the variant is benign. c.7418G>T has been reported as a likely benign change in individuals affected with Marfan and Marfan-like syndromes (Wooderchak-Donahue_2015). These report(s) do not provide unequivocal conclusions about association of the variant with Aortopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 25944730). Four submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as likely benign. Based on the evidence outlined above, the variant was classified as likely benign. -

FBN2-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 16, 2022

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Familial thoracic aortic aneurysm and aortic dissection

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 13, 2019

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Nov 01, 2023

See Variant Classification Assertion Criteria. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Pathogenic

0.25

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.73

D;.;D

Eigen

Uncertain

0.68

Eigen_PC

Uncertain

0.65

FATHMM_MKL

Uncertain

0.97

LIST_S2

Benign

0.83

T;.;.

M_CAP

Uncertain

0.12

MetaRNN

Benign

0.19

T;T;T

MetaSVM

Pathogenic

0.90

MutationAssessor

Benign

2.0

M;.;M

MutationTaster

Benign

0.94

D;D

PrimateAI

Benign

0.44

PROVEAN

Pathogenic

-4.4

D;.;D

REVEL

Pathogenic

0.80

Sift

Uncertain

0.0060

D;.;D

Polyphen

1.0

D;.;D

Vest4

0.77

MVP

0.87

MPC

0.85

ClinPred

0.26

GERP RS

5.0

Varity_R

0.46

gMVP

0.68

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