NM_000138.5:c.986T>C

Variant names:

Variant summary

Our verdict is Benign. Variant got -17 ACMG points: 3P and 20B. PM1PP2BP4_StrongBP6_Very_StrongBS1BS2

The NM_000138.5(FBN1):c.986T>C(p.Ile329Thr) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00124 in 1,614,086 control chromosomes in the GnomAD database, including 33 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Benign (★★★).

Frequency

Genomes: 𝑓 0.0068 ( 17 hom., cov: 32)

Exomes 𝑓: 0.00066 ( 16 hom. )

Consequence

FBN1
NM_000138.5 missense, splice_region

Scores

Splicing: ADA: 0.7362

Clinical Significance

Benign reviewed by expert panel U:1B:21

Conservation

PhyloP100: 7.52

Variant links:

Genes affected

FBN1 (HGNC:3603): (fibrillin 1) This gene encodes a member of the fibrillin family of proteins. The encoded preproprotein is proteolytically processed to generate two proteins including the extracellular matrix component fibrillin-1 and the protein hormone asprosin. Fibrillin-1 is an extracellular matrix glycoprotein that serves as a structural component of calcium-binding microfibrils. These microfibrils provide force-bearing structural support in elastic and nonelastic connective tissue throughout the body. Asprosin, secreted by white adipose tissue, has been shown to regulate glucose homeostasis. Mutations in this gene are associated with Marfan syndrome and the related MASS phenotype, as well as ectopia lentis syndrome, Weill-Marchesani syndrome, Shprintzen-Goldberg syndrome and neonatal progeroid syndrome. [provided by RefSeq, Apr 2016]

FBN1 links:

LOC124903488 (HGNC:):

LOC124903488 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -17 ACMG points.

PM1

In a region_of_interest Interaction with MFAP4 (size 210) in uniprot entity FBN1_HUMAN there are 27 pathogenic changes around while only 6 benign (82%) in NM_000138.5

PP2

Missense variant in the FBN1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 1311 curated pathogenic missense variants (we use a threshold of 10). The gene has 112 curated benign missense variants. Gene score misZ: 5.0644 (above the threshold of 3.09). Trascript score misZ: 8.1787 (above the threshold of 3.09). GenCC associations: The gene is linked to MASS syndrome, Weill-Marchesani syndrome, geleophysic dysplasia, Shprintzen-Goldberg syndrome, Acromicric dysplasia, familial thoracic aortic aneurysm and aortic dissection, progeroid and marfanoid aspect-lipodystrophy syndrome, ectopia lentis 1, isolated, autosomal dominant, Marfan syndrome, Weill-Marchesani syndrome 2, dominant, isolated ectopia lentis, neonatal Marfan syndrome, stiff skin syndrome.

BP4

Computational evidence support a benign effect (MetaRNN=0.0101932585).

BP6

Variant 15-48526132-A-G is Benign according to our data. Variant chr15-48526132-A-G is described in ClinVar as [Benign]. Clinvar id is 36133.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr15-48526132-A-G is described in Lovd as [Likely_benign]. Variant chr15-48526132-A-G is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00676 (1030/152278) while in subpopulation AFR AF= 0.0236 (982/41552). AF 95% confidence interval is 0.0224. There are 17 homozygotes in gnomad4. There are 481 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 1030 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FBN1	NM_000138.5 link	c.986T>C	p.Ile329Thr	missense_variant, splice_region_variant	Exon 9 of 66	ENST00000316623.10	NP_000129.3	P35555
FBN1	NM_001406716.1 link	c.986T>C	p.Ile329Thr	missense_variant, splice_region_variant	Exon 8 of 65		NP_001393645.1
LOC124903488	XR_007064628.1 link	n.-119A>G		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FBN1	ENST00000316623.10 link	c.986T>C	p.Ile329Thr	missense_variant, splice_region_variant	Exon 9 of 66	1	NM_000138.5	ENSP00000325527.5		P35555

Frequencies

GnomAD3 genomes

AF:

0.00674

AC:

1025

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0236

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00216

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:

0.0000588

Gnomad OTH

AF:

0.00526

GnomAD3 exomes

AF:

0.00163

AC:

410

AN:

251412

Hom.:

AF XY:

0.00113

AC XY:

154

AN XY:

135872

show subpopulations

Gnomad AFR exome

AF:

0.0234

Gnomad AMR exome

AF:

0.000549

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000131

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.000659

AC:

964

AN:

1461808

Hom.:

Cov.:

AF XY:

0.000510

AC XY:

371

AN XY:

727208

show subpopulations

Gnomad4 AFR exome

AF:

0.0245

Gnomad4 AMR exome

AF:

0.000760

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000812

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.00149

GnomAD4 genome

AF:

0.00676

AC:

1030

AN:

152278

Hom.:

Cov.:

AF XY:

0.00646

AC XY:

481

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.0236

Gnomad4 AMR

AF:

0.00216

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00521

Alfa

AF:

0.00114

Hom.:

Bravo

AF:

0.00766

ESP6500AA

AF:

0.0234

AC:

103

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00229

AC:

278

Asia WGS

AF:

0.00202

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Uncertain:1Benign:21

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Marfan syndrome

Uncertain:1Benign:6

Sep 26, 2023

ClinGen FBN1 Variant Curation Expert Panel, ClinGen

Significance: Benign

Review Status: reviewed by expert panel

Collection Method: curation

NM_000138.5 c.986T>C is a missense variant in FBN1 predicted to cause a substitution of an isoleucine by a threonine at amino acid 329 (p.Ile329Thr). This variant has been identified in numerous individuals with diagnoses or suspicion of Marfan syndrome in both the published literature and internal databases (PP4; PMIDs: 19293843, 24793577; Bichat, Mayo, UZG, UZA); however, in at least 2 of these cases, another pathogenic variant in FBN1 was also present (BP2; Bichat). This variant has been previously reported in ClinVar as likely benign or benign by more than 15 laboratories (Variation ID: 36133). It is present in gnomAD v3.1.2 at a frequency of 2.36% (977/41430 alleles) in the African/African American sub-population and is in the homozygous state in 17 total individuals (BA1; https://gnomad.broadinstitute.org/). Computational prediction tools and conservation analysis is unclear about a predicted impact of this variant. In summary, this variant meets criteria to be classified as benign for Marfan syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen FBN1 VCEP: BA1, BP2, PP4. The pathogenic evidence code PP4 was not considered to be in conflict with this conclusion. -

May 28, 2019

Mendelics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 05, 2024

All of Us Research Program, National Institutes of Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 01, 2016

Center for Human Genetics, Inc, Center for Human Genetics, Inc

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 07, 2017

Center for Medical Genetics Ghent, University of Ghent

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 27, 2012

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

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Feb 02, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Familial thoracic aortic aneurysm and aortic dissection

Benign:4

Jul 20, 2015

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as 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. -

Mar 09, 2018

Color Diagnostics, LLC DBA Color Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 02, 2016

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 02, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

not specified

Benign:2

Sep 22, 2014

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Ile329Thr in exon 9 of FBN1: This variant is not expected to have clinical signi ficance because it has been identified in 2.3% (103/4394) of African American ch romosomes by the NHLBI Exome Sequencing Project (http://evs.gs.washington.edu/EV S/; dbSNP rs12324002). -

Dec 03, 2014

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Benign:2

Apr 21, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 17, 2018

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is associated with the following publications: (PMID: 24793577, 19293843, 27153395, 26332594) -

Stiff skin syndrome

Benign:1

Feb 02, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Weill-Marchesani syndrome

Benign:1

Feb 02, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Geleophysic dysplasia

Benign:1

Feb 02, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Acromicric dysplasia

Benign:1

Feb 02, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Marfan syndrome;C4707243:Familial thoracic aortic aneurysm and aortic dissection

Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Ectopia lentis 1, isolated, autosomal dominant

Benign:1

Feb 02, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Connective tissue disorder

Benign:1

Aug 01, 2019

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.15

CADD

Uncertain

DANN

Uncertain

0.99

Eigen

Benign

0.012

Eigen_PC

Uncertain

0.24

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Benign

0.82

MetaRNN

Benign

0.010

MetaSVM

Uncertain

-0.19

PrimateAI

Uncertain

0.49

PROVEAN

Uncertain

-3.7

REVEL

Uncertain

0.47

Sift

Uncertain

0.025

Sift4G

Benign

0.094

Vest4

0.77

MVP

0.49

MPC

0.69

ClinPred

0.068

GERP RS

6.0

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.74

dbscSNV1_RF

Benign

0.58

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