rs765649978

Positions:

chr5-128335497-T-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 3P and 6B. PM1PP2BP4_ModerateBS2

The NM_001999.4(FBN2):c.3805A>G(p.Ser1269Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000397 in 1,614,112 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000040 ( 0 hom. )

Consequence

FBN2
NM_001999.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1O:1

Conservation

PhyloP100: 0.116

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 Likely_benign. Variant got -3 ACMG points.

PM1

In a disulfide_bond (size 13) in uniprot entity FBN2_HUMAN there are 5 pathogenic changes around while only 0 benign (100%) in NM_001999.4

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=0.08882663).

BS2

High AC in GnomAd4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBN2	NM_001999.4 linkuse as main transcript	c.3805A>G	p.Ser1269Gly	missense_variant	29/65	ENST00000262464.9
FBN2	XM_017009228.3 linkuse as main transcript	c.3652A>G	p.Ser1218Gly	missense_variant	28/64

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBN2	ENST00000262464.9 linkuse as main transcript	c.3805A>G	p.Ser1269Gly	missense_variant	29/65	1	NM_001999.4	P1	P35556-1

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152248

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000438

AC:

AN:

251320

Hom.:

AF XY:

0.0000442

AC XY:

AN XY:

135814

show subpopulations

Gnomad AFR exome

AF:

0.0000615

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:

0.00

Gnomad NFE exome

AF:

0.0000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000397

AC:

AN:

1461864

Hom.:

Cov.:

AF XY:

0.0000344

AC XY:

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

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:

0.0000468

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152248

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74386

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:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000981

Hom.:

Bravo

AF:

0.0000491

ExAC

AF:

0.0000412

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 27, 2022	Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports that this missense variant does not alter protein structure/function; Although located in a calcium-binding EGF-like domain of the FBN2 gene, it does not substitute or introduce a cysteine residue (Callewaert et al., 2008; Frederic et al., 2009); This variant is associated with the following publications: (PMID: 19006240, 18767143) -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jun 01, 2019	- -

Congenital contractural arachnodactyly

Benign:1Other:1

Likely benign, criteria provided, single submitter	clinical testing	Invitae	Oct 25, 2023	- -
not provided, no classification provided	phenotyping only	GenomeConnect, ClinGen	-	Variant interpreted as Uncertain significance and reported on 12-01-2015 by Lab or GTR ID 26957. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Familial thoracic aortic aneurysm and aortic dissection

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 30, 2019

The p.S1269G variant (also known as c.3805A>G), located in coding exon 29 of the FBN2 gene, results from an A to G substitution at nucleotide position 3805. The serine at codon 1269 is replaced by glycine, an amino acid with similar properties, and is located in the located in cbEGF-like #16 domain. This amino acid position is well conserved in available vertebrate species; however, glycine is the reference amino acid in other vertebrate species. Using the BDGP and ESEfinder splice site prediction tools, this alteration is predicted to create a new alternate splice donor site; however, direct evidence is unavailable. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.065

BayesDel_addAF

Benign

-0.091

BayesDel_noAF

Benign

-0.18

CADD

Benign

DANN

Benign

0.96

DEOGEN2

Benign

0.20

T;.;T;T;T

Eigen

Benign

-0.52

Eigen_PC

Benign

-0.40

FATHMM_MKL

Benign

0.35

LIST_S2

Benign

0.72

T;.;.;T;T

M_CAP

Benign

0.046

MetaRNN

Benign

0.089

T;T;T;T;T

MetaSVM

Uncertain

-0.044

MutationAssessor

Benign

0.22

N;.;N;.;.

MutationTaster

Benign

0.98

D;N;N;N

PrimateAI

Uncertain

0.50

PROVEAN

Benign

-0.68

N;.;N;N;N

REVEL

Uncertain

0.31

Sift

Benign

0.59

T;.;T;T;T

Sift4G

Benign

0.51

.;.;.;T;T

Polyphen

0.0010

B;.;B;.;B

Vest4

0.10

MutPred

0.47

Loss of phosphorylation at S1269 (P = 0.0903);.;Loss of phosphorylation at S1269 (P = 0.0903);.;.;

MVP

0.47

MPC

0.22

ClinPred

0.054

GERP RS

4.1

Varity_R

0.040

gMVP

0.73

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.15

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