VCV002443185.2 - ClinVar

NM_138386.3(NAF1):c.691A>T (p.Lys231Ter)

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.

Likely pathogenic

no assertion criteria provided

Somatic

No data submitted for somatic clinical impact

Somatic

No data submitted for oncogenicity

Variant Details

Identifiers

NM_138386.3(NAF1):c.691A>T (p.Lys231Ter)

Variation ID: 2443185 Accession: VCV002443185.2

Type and length

single nucleotide variant, 1 bp

Location

Cytogenetic: 4q32.2 4: 163145808 (GRCh38) [ NCBI UCSC ] 4: 164066960 (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	Mar 18, 2023	Mar 18, 2023	Aug 28, 2022

HGVS

Nucleotide	Protein	Molecular consequence
NM_138386.3:c.691A>T MANE Select Help Transcripts from the Matched Annotation from the NCBI and EMBL-EBI (MANE) collaboration.	NP_612395.2:p.Lys231Ter	nonsense
NM_001128931.2:c.691A>T	NP_001122403.1:p.Lys231Ter	nonsense
NC_000004.12:g.163145808T>A
NC_000004.11:g.164066960T>A

Protein change

K231*

Other names

Canonical SPDI

NC_000004.12:163145807:T:A

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.
NAF1		-	-	GRCh38 GRCh37	178	223

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.
not provided	Likely pathogenic (1)	no assertion criteria provided	Aug 28, 2022	RCV003151577.2

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.
Likely pathogenic (Aug 28, 2022)	no assertion criteria provided Method: clinical testing	not provided Affected status: yes Allele origin: germline	Genetic Services Laboratory, University of Chicago Accession: SCV003839760.1 First in ClinVar: Mar 18, 2023 Last updated: Mar 18, 2023	Comment: DNA sequence analysis of the NAF1 gene demonstrated a sequence change, c.691A>T, which results in the creation of a premature stop codon at amino acid … (more) DNA sequence analysis of the NAF1 gene demonstrated a sequence change, c.691A>T, which results in the creation of a premature stop codon at amino acid position 231, p.Lys231*. This sequence change is predicted to result in an abnormal transcript, which may be degraded, or may lead to the production of a truncated NAF1 protein with potentially abnormal function. This sequence change does not appear to have been previously described in individuals with NAF1-related disorders, however, other truncating sequence changes have been described in individuals with NAF1-related telomere biology disorders (PMID: 27510903). This sequence change has also not been described in the population databases such as ExAC and gnomAD. These collective evidences indicate that this sequence change is likely pathogenic, however, functional studies have not been completed to prove this conclusively. Heterozygous pathogenic variants in the NAF1 gene have been described in individuals with short telomere length, pulmonary fibrosis, low telomerase RNA levels, and extra-pulmonary manifestations including myelodysplastic syndrome and liver disease (PMID: 27510903). (less)

Comment:

DNA sequence analysis of the NAF1 gene demonstrated a sequence change, c.691A>T, which results in the creation of a premature stop codon at amino acid position 231, p.Lys231*. This sequence change is predicted to result in an abnormal transcript, which may be degraded, or may lead to the production of a truncated NAF1 protein with potentially abnormal function. This sequence change does not appear to have been previously described in individuals with NAF1-related disorders, however, other truncating sequence changes have been described in individuals with NAF1-related telomere biology disorders (PMID: 27510903). This sequence change has also not been described in the population databases such as ExAC and gnomAD. These collective evidences indicate that this sequence change is likely pathogenic, however, functional studies have not been completed to prove this conclusively. Heterozygous pathogenic variants in the NAF1 gene have been described in individuals with short telomere length, pulmonary fibrosis, low telomerase RNA levels, and extra-pulmonary manifestations including myelodysplastic syndrome and liver disease (PMID: 27510903).

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

There are no citations for germline classification of this variant in ClinVar. If you know of citations for this variation, please consider submitting that information to ClinVar.

Text-mined citations for this variant ...

Record last updated Apr 09, 2023

ClinVar Genomic variation as it relates to human health

NM_138386.3(NAF1):c.691A>T (p.Lys231Ter)

Variant Details

Genes

Conditions - Germline

Submissions - Germline

Germline Functional Evidence

Citations for germline classification of this variant

Text-mined citations for this variant ...