NM_000138.5(FBN1):c.4163G>A (p.Arg1388His) AND Familial thoracic aortic aneurysm and aortic dissection

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: May 31, 2023
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV001180615.6

Allele description [Variation Report for NM_000138.5(FBN1):c.4163G>A (p.Arg1388His)]

NM_000138.5(FBN1):c.4163G>A (p.Arg1388His)

Gene:

FBN1:fibrillin 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

15q21.1

Genomic location:

Preferred name:

NM_000138.5(FBN1):c.4163G>A (p.Arg1388His)

HGVS:

NC_000015.10:g.48474302C>T
NG_008805.2:g.176487G>A
NM_000138.5:c.4163G>AMANE SELECT
NP_000129.3:p.Arg1388His
NP_000129.3:p.Arg1388His
LRG_778t1:c.4163G>A
LRG_778:g.176487G>A
LRG_778p1:p.Arg1388His
NC_000015.9:g.48766499C>T
NM_000138.4:c.4163G>A

Protein change:

R1388H

Links:

dbSNP: rs749196340

NCBI 1000 Genomes Browser:

rs749196340

Molecular consequence:

NM_000138.5:c.4163G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Familial thoracic aortic aneurysm and aortic dissection (TAAD)
Synonyms:: Thoracic aortic aneurysm and aortic dissection; Thoracic aortic aneurysms and dissections
Identifiers:: MONDO: MONDO:0019625; MedGen: C4707243; Orphanet: 91387; OMIM: PS607086

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV001345581	Color Diagnostics, LLC DBA Color Health	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain significance (May 31, 2023)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV003998983	Ambry Genetics	criteria provided, single submitter (Ambry Variant Classification Scheme 2023)	Uncertain significance (Apr 14, 2023)	germline	clinical testing	PubMed (2) [See all records that cite these PMIDs] 27930701, 33824467 Citation Link

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV001345581

Color Diagnostics, LLC DBA Color Health

criteria provided, single submitter

(ACMG Guidelines, 2015)

Uncertain significance
(May 31, 2023)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

SCV003998983

Ambry Genetics

criteria provided, single submitter

(Ambry Variant Classification Scheme 2023)

Uncertain significance
(Apr 14, 2023)

germline

clinical testing

PubMed (2)
[See all records that cite these PMIDs]

Citation Link

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology.

Richards S, Aziz N, Bale S, Bick D, Das S, Gastier-Foster J, Grody WW, Hegde M, Lyon E, Spector E, Voelkerding K, Rehm HL; ACMG Laboratory Quality Assurance Committee..

Genet Med. 2015 May;17(5):405-24. doi: 10.1038/gim.2015.30. Epub 2015 Mar 5.

PubMed [citation]

PMID:: 25741868
PMCID:: PMC4544753

Natural and Undetermined Sudden Death: Value of Post-Mortem Genetic Investigation.

Sanchez O, Campuzano O, Fernández-Falgueras A, Sarquella-Brugada G, Cesar S, Mademont I, Mates J, Pérez-Serra A, Coll M, Pico F, Iglesias A, Tirón C, Allegue C, Carro E, Gallego MÁ, Ferrer-Costa C, Hospital A, Bardalet N, Borondo JC, Vingut A, Arbelo E, Brugada J, et al.

PLoS One. 2016;11(12):e0167358. doi: 10.1371/journal.pone.0167358. Erratum in: PLoS One. 2017 Feb 6;12(2):e0171893. doi: 10.1371/journal.pone.0171893.

PubMed [citation]

PMID:: 27930701
PMCID:: PMC5145162

See all PubMed Citations (3)

Details of each submission

From Color Diagnostics, LLC DBA Color Health, SCV001345581.3

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

This missense variant replaces arginine with histidine at codon 1388 of the FBN1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with FBN1-related disorders in the literature. This variant has been identified in 6/282700 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Ambry Genetics, SCV003998983.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (2)

Description

The p.R1388H variant (also known as c.4163G>A), located in coding exon 33 of the FBN1 gene, results from a G to A substitution at nucleotide position 4163. The arginine at codon 1388 is replaced by histidine, an amino acid with highly similar properties. This alteration has been reported in a sudden unexplained death cohort and a thoracic aortic aneurysm and dissection cohort; however, clinical details were limited in both cases (Sanchez O et al. PLoS One, 2016 Dec;11:e0167358; Li Y et al. Eur J Hum Genet, 2021 Jul;29:1129-1138). This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Oct 20, 2024

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