NM_001999.4:c.76A>G

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_001999.4(FBN2):c.76A>G(p.Thr26Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000123 in 1,583,024 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. T26T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

FBN2
NM_001999.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:6

Conservation

PhyloP100: 1.11

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

congenital contractural arachnodactyly
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P, Orphanet
carpal tunnel syndrome
Inheritance: AD Classification: LIMITED Submitted by: Franklin by Genoox
macular degeneration, early-onset
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
familial thoracic aortic aneurysm and aortic dissection
Inheritance: Unknown Classification: LIMITED Submitted by: ClinGen

FBN2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.00711298).

BP6

Variant 5-128537528-T-C is Benign according to our data. Variant chr5-128537528-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 213260.

BS2

High AC in GnomAd4 at 20 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001999.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FBN2	NM_001999.4	MANE Select	c.76A>G	p.Thr26Ala	missense	Exon 1 of 65	NP_001990.2	P35556-1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
FBN2	ENST00000262464.9	TSL:1 MANE Select	c.76A>G	p.Thr26Ala	missense	Exon 1 of 65	ENSP00000262464.4	P35556-1
FBN2	ENST00000502468.5	TSL:1	c.76A>G	p.Thr26Ala	missense	Exon 1 of 8	ENSP00000424753.1	E9PHW4
FBN2	ENST00000939405.1		c.76A>G	p.Thr26Ala	missense	Exon 1 of 64	ENSP00000609464.1

Frequencies

GnomAD3 genomes

AF:

0.000132

AC:

AN:

152050

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00547

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

GnomAD2 exomes

AF:

0.000250

AC:

AN:

195866

AF XY:

0.000271

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00443

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000821

Gnomad OTH exome

AF:

0.000391

GnomAD4 exome

AF:

0.000122

AC:

175

AN:

1430974

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

709568

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32830

American (AMR)

AF:

0.00

AC:

AN:

41174

Ashkenazi Jewish (ASJ)

AF:

0.00515

AC:

132

AN:

25608

East Asian (EAS)

AF:

0.00

AC:

AN:

37870

South Asian (SAS)

AF:

0.00

AC:

AN:

82800

European-Finnish (FIN)

AF:

0.00

AC:

AN:

46118

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5718

European-Non Finnish (NFE)

AF:

0.0000155

AC:

AN:

1099586

Other (OTH)

AF:

0.000439

AC:

AN:

59270

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000132

AC:

AN:

152050

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74258

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41414

American (AMR)

AF:

0.0000655

AC:

AN:

15276

Ashkenazi Jewish (ASJ)

AF:

0.00547

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5166

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67980

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.568

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000588

Hom.:

Bravo

AF:

0.000170

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000236

AC:

ExAC

AF:

0.000142

AC:

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Congenital contractural arachnodactyly (2)

not provided (2)

Ehlers-Danlos syndrome (1)

Familial thoracic aortic aneurysm and aortic dissection (1)

FBN2-related disorder (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.055

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Benign

-0.36

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Benign

0.15

Eigen

Benign

-0.34

Eigen_PC

Benign

-0.14

FATHMM_MKL

Benign

0.22

LIST_S2

Benign

0.67

M_CAP

Pathogenic

0.42

MetaRNN

Benign

0.0071

MetaSVM

Benign

-0.86

MutationAssessor

Benign

0.0

PhyloP100

1.1

PrimateAI

Pathogenic

0.80

PROVEAN

Benign

-0.27

REVEL

Benign

0.14

Sift

Benign

0.27

Sift4G

Benign

1.0

Polyphen

0.0

Vest4

0.087

MVP

0.20

MPC

0.23

ClinPred

0.022

GERP RS

3.4

PromoterAI

0.22

Neutral

(source)

Varity_R

0.045

gMVP

0.49

Mutation Taster

=78/22

polymorphism

(source)

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over