rs139668142

Positions:

chr5-128300906-G-A

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 1P and 5B. PP2BS1_SupportingBS2

The NM_001999.4(FBN2):c.6077C>T(p.Ser2026Phe) variant causes a missense change. The variant allele was found at a frequency of 0.0000266 in 1,613,856 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000017 ( 0 hom. )

Consequence

FBN2
NM_001999.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 5.89

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 -4 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.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000118 (18/152302) while in subpopulation AFR AF= 0.000409 (17/41568). AF 95% confidence interval is 0.00026. There are 0 homozygotes in gnomad4. There are 8 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 18 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBN2	NM_001999.4 linkuse as main transcript	c.6077C>T	p.Ser2026Phe	missense_variant	48/65	ENST00000262464.9
FBN2	XM_017009228.3 linkuse as main transcript	c.5924C>T	p.Ser1975Phe	missense_variant	47/64

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBN2	ENST00000262464.9 linkuse as main transcript	c.6077C>T	p.Ser2026Phe	missense_variant	48/65	1	NM_001999.4	P1	P35556-1
FBN2	ENST00000703783.1 linkuse as main transcript	n.2861C>T		non_coding_transcript_exon_variant	23/38
FBN2	ENST00000703785.1 linkuse as main transcript	n.2780C>T		non_coding_transcript_exon_variant	22/27

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000410

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000239

AC:

AN:

251266

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135788

show subpopulations

Gnomad AFR exome

AF:

0.000369

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000171

AC:

AN:

1461554

Hom.:

Cov.:

AF XY:

0.0000165

AC XY:

AN XY:

727130

show subpopulations

Gnomad4 AFR exome

AF:

0.000508

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:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.0000994

GnomAD4 genome

AF:

0.000118

AC:

AN:

152302

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

74480

show subpopulations

Gnomad4 AFR

AF:

0.000409

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000200

Hom.:

Bravo

AF:

0.000136

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 10, 2024

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; Although located in a calcium-binding EGF-like domain of the FBN2 gene, it does not substitute or introduce a cysteine residue (PMID: 19006240, 18767143); This variant is associated with the following publications: (PMID: 19006240, 18767143) -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 25, 2012

There is insufficient or conflicting evidence for classification of this alteration. -

Congenital contractural arachnodactyly;C4015286:Macular degeneration, early-onset

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Congenital contractural arachnodactyly

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 09, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.19

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Uncertain

-0.060

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.51

D;.;D

Eigen

Uncertain

0.45

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.84

T;.;.

M_CAP

Uncertain

0.11

MetaRNN

Uncertain

0.53

D;D;D

MetaSVM

Uncertain

0.20

MutationAssessor

Benign

0.71

N;.;N

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.55

PROVEAN

Uncertain

-2.8

D;.;D

REVEL

Uncertain

0.60

Sift

Benign

0.051

T;.;T

Polyphen

0.86

P;.;P

Vest4

0.53

MVP

0.37

MPC

0.65

ClinPred

0.49

GERP RS

5.5

Varity_R

0.14

gMVP

0.57

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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