NM_000551.4:c.226_227delTT

Variant names:

• chr3-10142072-CTT-C
• rs1060503552
• NM_000551.4:c.226_227delTT

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000551.4(VHL):​c.226_227delTT​(p.Phe76LeufsTer55) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: VHL NM_000551.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 4.96

Genes affected

VHL (HGNC:12687): (von Hippel-Lindau tumor suppressor) This gene encodes a component of a ubiquitination complex. The encoded protein is involved in the ubiquitination and degradation of hypoxia-inducible-factor (HIF), which is a transcription factor that plays a central role in the regulation of gene expression by oxygen. In addition to oxygen-related gene expression, this protein plays a role in many other cellular processes including cilia formation, cytokine signaling, regulation of senescence, and formation of the extracellular matrix. Variants of this gene are associated with von Hippel-Lindau syndrome, pheochromocytoma, erythrocytosis, renal cell carcinoma, and cerebellar hemangioblastoma. [provided by RefSeq, Jun 2022]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-10142072-CTT-C is Pathogenic according to our data. Variant chr3-10142072-CTT-C is described in ClinVar as [Pathogenic]. Clinvar id is 411961.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
VHL	NM_000551.4	c.226_227delTT	p.Phe76LeufsTer55	frameshift_variant	Exon 1 of 3	ENST00000256474.3	NP_000542.1
VHL	NM_001354723.2	c.226_227delTT	p.Phe76LeufsTer105	frameshift_variant	Exon 1 of 3		NP_001341652.1
VHL	NM_198156.3	c.226_227delTT	p.Phe76LeufsTer56	frameshift_variant	Exon 1 of 2		NP_937799.1
VHL	NR_176335.1	n.296_297delTT		non_coding_transcript_exon_variant	Exon 1 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
VHL	ENST00000256474.3	c.226_227delTT	p.Phe76LeufsTer55	frameshift_variant	Exon 1 of 3	1	NM_000551.4	ENSP00000256474.3

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Von Hippel-Lindau syndrome;C1837915:Chuvash polycythemia Pathogenic:1

Oct 25, 2016

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. While this particular variant has not been reported in the literature, loss-of-function variants in VHL are known to be pathogenic (PMID: 8956040, 12202531). This sequence change deletes 2 nucleotides from exon 1 of the VHL mRNA (c.226_227delTT), causing a frameshift at codon 76. This creates a premature translational stop signal (p.Phe76Leufs*55) and is expected to result in an absent or disrupted protein product. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Dec 01, 2020

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.226_227delTT pathogenic mutation, located in coding exon 1 of the VHL gene, results from a deletion of two nucleotides at nucleotide positions 226 to 227, causing a translational frameshift with a predicted alternate stop codon (p.F76Lfs*55). This mutation has been reported in a patient with a personal and family history consistent with Von Hippel-Lindau (VHL) disease (Ambry internal data). This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
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

Other links and lift over

dbSNP: rs1060503552; hg19: chr3-10183756;