Variant rs773050231 details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_003227.4(TFR2):c.1398del(p.Arg468AlafsTer23) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000226 in 1,461,776 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000023 ( 0 hom. )

Consequence

TFR2
NM_003227.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2

Conservation

PhyloP100: -0.314

Variant links:

Genes affected

TFR2 (HGNC:11762): (transferrin receptor 2) This gene encodes a single-pass type II membrane protein, which is a member of the transferrin receptor-like family. This protein mediates cellular uptake of transferrin-bound iron, and may be involved in iron metabolism, hepatocyte function and erythrocyte differentiation. Mutations in this gene have been associated with hereditary hemochromatosis type III. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, May 2011]

TFR2 links:

LOC124901709 (HGNC:):

LOC124901709 links:

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ACMG classification

Classification made for transcript

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 7-100628298-GC-G is Pathogenic according to our data. Variant chr7-100628298-GC-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 461197.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
TFR2	NM_003227.4 linkuse as main transcript	c.1398del	p.Arg468AlafsTer23	frameshift_variant	11/18	ENST00000223051.8	NP_003218.2
LOC124901709	XR_007060454.1 linkuse as main transcript	n.434-2856del		intron_variant, non_coding_transcript_variant
TFR2	NM_001206855.3 linkuse as main transcript	c.885del	p.Arg297AlafsTer23	frameshift_variant	8/15		NP_001193784.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TFR2	ENST00000223051.8 linkuse as main transcript	c.1398del	p.Arg468AlafsTer23	frameshift_variant	11/18	1	NM_003227.4	ENSP00000223051	P1	Q9UP52-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.000108

AC:

AN:

250706

Hom.:

AF XY:

0.0000811

AC XY:

AN XY:

135636

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000781

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000226

AC:

AN:

1461776

Hom.:

Cov.:

AF XY:

0.0000179

AC XY:

AN XY:

727180

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000738

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.0000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hemochromatosis type 3

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Mar 08, 2024

- -

Hereditary hemochromatosis

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 21, 2023

This sequence change creates a premature translational stop signal (p.Arg468Alafs*23) in the TFR2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in TFR2 are known to be pathogenic (PMID: 23600741, 26029709). This variant is present in population databases (rs773050231, gnomAD 0.08%). This variant has not been reported in the literature in individuals affected with TFR2-related conditions. ClinVar contains an entry for this variant (Variation ID: 461197). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over