rs754813237

Positions:

chr7-100633021-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_003227.4(TFR2):c.829G>T(p.Val277Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000421 in 1,613,684 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Benignin Lovd.

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 30)

Exomes 𝑓: 0.000042 ( 0 hom. )

Consequence

TFR2
NM_003227.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:2

Conservation

PhyloP100: -0.934

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.07404435).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
TFR2	NM_003227.4 linkuse as main transcript	c.829G>T	p.Val277Leu	missense_variant	6/18	ENST00000223051.8
LOC124901709	XR_007060454.1 linkuse as main transcript	n.602C>A		non_coding_transcript_exon_variant	3/3
TFR2	NM_001206855.3 linkuse as main transcript	c.316G>T	p.Val106Leu	missense_variant	3/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TFR2	ENST00000223051.8 linkuse as main transcript	c.829G>T	p.Val277Leu	missense_variant	6/18	1	NM_003227.4	P1	Q9UP52-1

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152176

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000443

AC:

AN:

248318

Hom.:

AF XY:

0.0000370

AC XY:

AN XY:

135020

show subpopulations

Gnomad AFR exome

AF:

0.0000639

Gnomad AMR exome

AF:

0.0000580

Gnomad ASJ exome

AF:

0.0000999

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000626

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000424

AC:

AN:

1461508

Hom.:

Cov.:

AF XY:

0.0000303

AC XY:

AN XY:

727076

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.000153

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000477

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152176

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.0000659

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Hemochromatosis type 3

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Natera, Inc.

Sep 16, 2020

- -

Hereditary hemochromatosis

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 08, 2021

This sequence change replaces valine with leucine at codon 277 of the TFR2 protein (p.Val277Leu). The valine residue is weakly conserved and there is a small physicochemical difference between valine and leucine. This variant has not been reported in the literature in individuals affected with TFR2-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The leucine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.40

BayesDel_noAF

Benign

-0.63

CADD

Benign

2.1

DANN

Benign

0.88

DEOGEN2

Benign

0.046

T;.;T

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.034

LIST_S2

Benign

0.17

T;T;.

M_CAP

Benign

0.0055

MetaRNN

Benign

0.074

T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.77

N;.;N

MutationTaster

Benign

1.0

N;N;N;N

PrimateAI

Benign

0.32

PROVEAN

Benign

-0.16

N;N;N

REVEL

Benign

0.038

Sift

Benign

0.36

T;T;T

Sift4G

Benign

0.84

T;T;T

Polyphen

0.0

B;.;B

Vest4

0.17

MutPred

0.60

Loss of MoRF binding (P = 0.0997);Loss of MoRF binding (P = 0.0997);Loss of MoRF binding (P = 0.0997);

MVP

0.17

MPC

0.33

ClinPred

0.029

GERP RS

-1.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.069

gMVP

0.46

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