NM_000138.5(FBN1):c.6534T>A (p.Asn2178Lys) AND multiple conditions

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Jan 11, 2024
Review status:: 1 star out of maximum of 4 stars
criteria provided, single submitter

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:: RCV000797077.14

Allele description [Variation Report for NM_000138.5(FBN1):c.6534T>A (p.Asn2178Lys)]

NM_000138.5(FBN1):c.6534T>A (p.Asn2178Lys)

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.6534T>A (p.Asn2178Lys)

HGVS:

NC_000015.10:g.48434676A>T
NG_008805.2:g.216113T>A
NM_000138.5:c.6534T>AMANE SELECT
NP_000129.3:p.Asn2178Lys
NP_000129.3:p.Asn2178Lys
LRG_778t1:c.6534T>A
LRG_778:g.216113T>A
LRG_778p1:p.Asn2178Lys
NC_000015.9:g.48726873A>T
NM_000138.4:c.6534T>A

Protein change:

N2178K

Links:

dbSNP: rs770257902

NCBI 1000 Genomes Browser:

rs770257902

Molecular consequence:

NM_000138.5:c.6534T>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Marfan syndrome (MFS)
Synonyms:: MARFAN SYNDROME, TYPE I; Marfan syndrome type 1; Marfan's syndrome; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0007947; MedGen: C0024796; Orphanet: 284963; Orphanet: 558; OMIM: 154700

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
SCV000936617	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jan 11, 2024)	germline	clinical testing	PubMed (2) [See all records that cite these PMIDs] 24833718, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000936617

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jan 11, 2024)

germline

clinical testing

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

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

Rare variants in FBN1 and FBN2 are associated with severe adolescent idiopathic scoliosis.

Buchan JG, Alvarado DM, Haller GE, Cruchaga C, Harms MB, Zhang T, Willing MC, Grange DK, Braverman AC, Miller NH, Morcuende JA, Tang NL, Lam TP, Ng BK, Cheng JC, Dobbs MB, Gurnett CA.

Hum Mol Genet. 2014 Oct 1;23(19):5271-82. doi: 10.1093/hmg/ddu224. Epub 2014 May 15.

PubMed [citation]

PMID:: 24833718
PMCID:: PMC4159151

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group, Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV000936617.4

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

Description

This sequence change replaces asparagine, which is neutral and polar, with lysine, which is basic and polar, at codon 2178 of the FBN1 protein (p.Asn2178Lys). This variant is present in population databases (rs770257902, gnomAD 0.002%). This missense change has been observed in individual(s) with adolescent idiopathic scoliosis (PMID: 24833718). ClinVar contains an entry for this variant (Variation ID: 519782). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt FBN1 protein function with a positive predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been 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

Last Updated: Jan 13, 2025

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