VCV002138144.2 - ClinVar

NM_000371.4(TTR):c.148G>T (p.Val50Leu)

Germline

Classification

The aggregate germline classification for this variant, typically for a monogenic or Mendelian disorder as in the ACMG/AMP guidelines, or for response to a drug. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the aggregate classification.

(1)

Stars represent the aggregate review status, or the level of review supporting the aggregate germline classification for this VCV record. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status. The number of submissions which contribute to this review status is shown in parentheses.

Pathogenic

criteria provided, single submitter

Somatic

No data submitted for somatic clinical impact

Somatic

No data submitted for oncogenicity

Variant Details

Identifiers

NM_000371.4(TTR):c.148G>T (p.Val50Leu)

Variation ID: 2138144 Accession: VCV002138144.2

Type and length

single nucleotide variant, 1 bp

Location

Cytogenetic: 18q12.1 18: 31592974 (GRCh38) [ NCBI UCSC ] 18: 29172937 (GRCh37) [ NCBI UCSC ]

Timeline in ClinVar

	First in ClinVar Help The date this variant first appeared in ClinVar with each type of classification.	Last submission Help The date of the most recent submission for each type of classification for this variant.	Last evaluated Help The most recent date that a submitter evaluated this variant for each type of classification.
Germline	Feb 8, 2023	Feb 14, 2024	Jan 31, 2024

HGVS

Nucleotide	Protein	Molecular consequence
NM_000371.4:c.148G>T MANE Select Help Transcripts from the Matched Annotation from the NCBI and EMBL-EBI (MANE) collaboration.	NP_000362.1:p.Val50Leu	missense
NC_000018.10:g.31592974G>T
NC_000018.9:g.29172937G>T
NG_009490.1:g.6208G>T
LRG_416:g.6208G>T
LRG_416t1:c.148G>T	LRG_416p1:p.Val50Leu

... more HGVS ... less HGVS

Protein change

V50L

Other names

Canonical SPDI

NC_000018.10:31592973:G:T

Functional consequence Help The effect of the variant on RNA or protein function, based on experimental evidence from submitters.

Global minor allele frequency (GMAF) Help The global minor allele frequency calculated by the 1000 Genomes Project. The minor allele at this location is indicated in parentheses and may be different from the allele represented by this VCV record.

Allele frequency Help The frequency of the allele represented by this VCV record.

Links

VarSome

Genes

Gene	OMIM	ClinGen Gene Dosage Sensitivity Curation		Variation Viewer Help Links to Variation Viewer, a genome browser to view variation data from NCBI databases.	Related variants
Gene	OMIM	HI score Help The haploinsufficiency score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team.	TS score Help The triplosensitivity score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team.		Within gene Help The number of variants in ClinVar that are contained within this gene, with a link to view the list of variants.	All Help The number of variants in ClinVar for this gene, including smaller variants within the gene and larger CNVs that overlap or fully contain the gene.
TTR		-	-	GRCh38 GRCh37	375	422

Conditions - Germline

Condition Help The condition for this variant-condition (RCV) record in ClinVar.	Classification Help The aggregate germline classification for this variant-condition (RCV) record in ClinVar. The number of submissions that contribute to this aggregate classification is shown in parentheses. (# of submissions)	Review status Help The aggregate review status for this variant-condition (RCV) record in ClinVar. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status.	Last evaluated Help The most recent date that a submitter evaluated this variant for the condition.	Variation/condition record Help The RCV accession number, with most recent version number, for the variant-condition record, with a link to the RCV web page.
Amyloidosis, hereditary systemic 1	Pathogenic (1)	criteria provided, single submitter	Jan 31, 2024	RCV003050501.3

Submissions - Germline

Classification Help The submitted germline classification for each SCV record. (Last evaluated)	Review status Help Stars represent the review status, or the level of review supporting the submitted (SCV) record. This value is calculated by NCBI based on data from the submitter. Read our rules for calculating the review status. This column also includes a link to the submitter’s assertion criteria if provided, and the collection method. (Assertion criteria)	Condition Help The condition for the classification, provided by the submitter for this submitted (SCV) record. This column also includes the affected status and allele origin of individuals observed with this variant.	Submitter Help The submitting organization for this submitted (SCV) record. This column also includes the SCV accession and version number, the date this SCV first appeared in ClinVar, and the date that this SCV was last updated in ClinVar.	More information Help This column includes more information supporting the classification, including citations, the comment on classification, and detailed evidence provided as observations of the variant by the submitter.
Pathogenic (Jan 31, 2024)	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015)) Method: clinical testing	Amyloidosis, hereditary systemic 1 Affected status: unknown Allele origin: germline	Labcorp Genetics (formerly Invitae), Labcorp Accession: SCV003442588.2 First in ClinVar: Feb 07, 2023 Last updated: Feb 14, 2024	Publications: PubMed (6) PubMed: 1520326‚ 19922332‚ 27212199‚ 22620962‚ 23833285‚ 24555660 Comment: This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 50 of the TTR protein (p.Val50Leu). … (more) This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 50 of the TTR protein (p.Val50Leu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of familial transthyretin amyloidosis (PMID: 1520326, 19922332, 27212199). This variant is also known as p.Val30Leu. ClinVar contains an entry for this variant (Variation ID: 2138144). 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 TTR protein function with a positive predictive value of 95%. This variant disrupts the p.Val50 amino acid residue in TTR. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 22620962, 23833285, 24555660). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. (less)

Comment:

This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 50 of the TTR protein (p.Val50Leu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of familial transthyretin amyloidosis (PMID: 1520326, 19922332, 27212199). This variant is also known as p.Val30Leu. ClinVar contains an entry for this variant (Variation ID: 2138144). 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 TTR protein function with a positive predictive value of 95%. This variant disrupts the p.Val50 amino acid residue in TTR. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 22620962, 23833285, 24555660). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic.

Germline Functional Evidence

There is no functional evidence in ClinVar for this variation. If you have generated functional data for this variation, please consider submitting that data to ClinVar.

Comment:

Citations for germline classification of this variant

Title	Author	Journal	Year	Link
Exome Sequencing and Gene Prioritization Correct Misdiagnosis in a Chinese Kindred with Familial Amyloid Polyneuropathy.	Chen H	Scientific reports	2016	PMID: 27212199
Frequency of the transthyretin Val30Met mutation in the northern Swedish population.	Olsson M	Amyloid : the international journal of experimental and clinical investigation : the official journal of the International Society of Amyloidosis	2014	PMID: 24555660
Reduced myocardial 123-iodine metaiodobenzylguanidine uptake: a prognostic marker in familial amyloid polyneuropathy.	Coutinho MC	Circulation. Cardiovascular imaging	2013	PMID: 23833285
Genotype--phenotype correlation in FAP.	Zeldenrust SR	Amyloid : the international journal of experimental and clinical investigation : the official journal of the International Society of Amyloidosis	2012	PMID: 22620962
Report of five rare or previously unknown amyloidogenic transthyretin mutations disclosed in Sweden.	Suhr OB	Amyloid : the international journal of experimental and clinical investigation : the official journal of the International Society of Amyloidosis	2009	PMID: 19922332
A novel transthyretin mutation at position 30 (Leu for Val) associated with familial amyloidotic polyneuropathy.	Murakami T	Biochemical and biophysical research communications	1992	PMID: 1520326

Text-mined citations for this variant ...

Record last updated Sep 29, 2024

ClinVar Genomic variation as it relates to human health

NM_000371.4(TTR):c.148G>T (p.Val50Leu)

Variant Details

Genes

Conditions - Germline

Submissions - Germline

Germline Functional Evidence

Citations for germline classification of this variant

Text-mined citations for this variant ...