rs137853121

Positions:

chr22-37084775-G-T

Variant summary

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

The NM_001374504.1(TMPRSS6):c.1038C>A(p.Tyr346Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000051 in 1,567,206 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000042 ( 0 hom. )

Consequence

TMPRSS6
NM_001374504.1 stop_gained

Scores

Clinical Significance

Likely pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 1.66

Variant links:

Genes affected

TMPRSS6 (HGNC:16517): (transmembrane serine protease 6) The protein encoded by this gene is a type II transmembrane serine proteinase that is found attached to the cell surface. The encoded protein may be involved in matrix remodeling processes in the liver. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2014]

TMPRSS6 links:

Genome browser will be placed here

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 22-37084775-G-T is Pathogenic according to our data. Variant chr22-37084775-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1405.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr22-37084775-G-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TMPRSS6	NM_001374504.1 linkuse as main transcript	c.1038C>A	p.Tyr346Ter	stop_gained	9/18	ENST00000676104.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TMPRSS6	ENST00000676104.1 linkuse as main transcript	c.1038C>A	p.Tyr346Ter	stop_gained	9/18		NM_001374504.1	P1	Q8IU80-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152198

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000560

AC:

AN:

178518

Hom.:

AF XY:

0.0000106

AC XY:

AN XY:

94504

show subpopulations

Gnomad AFR exome

AF:

0.0000934

Gnomad AMR exome

AF:

0.00

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:

0.00000424

AC:

AN:

1414890

Hom.:

Cov.:

AF XY:

0.00000572

AC XY:

AN XY:

699108

show subpopulations

Gnomad4 AFR exome

AF:

0.0000306

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000267

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000368

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152316

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74474

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ExAC

AF:

0.0000170

AC:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Iron-refractory iron deficiency anemia

Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	May 01, 2008	- -
Likely pathogenic, criteria provided, single submitter	curation	Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard	May 02, 2023	The heterozygous p.Tyr346Ter variant in TMPRSS6 was identified by our study, in the compound heterozygous state with a likely pathogenic variant (Variation ID: 1406), in one individual with iron-refractory iron deficiency anemia. This individual also carried a likely pathogenic variant (Variation ID: 1406), however the phase of these variants is unknown at this time. The p.Tyr346Ter variant in TMPRSS6 has been previously reported in one individual with iron-refractory iron deficiency anemia (PMID: 18408718) but has been identified in 0.009% (1/10706) of African/African American chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs137853121). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. This previously reported individual was a compound heterozygote that carried a reported likely pathogenic variant in unknown phase (ClinVar Variation ID: 1406), which increases the likelihood that the p.Tyr346Ter variant is pathogenic.This variant has also been reported in ClinVar (Variation ID: 1405) and has been interpreted as pathogenic by OMIM and as likely pathogenic by GeneDx. This nonsense variant leads to a premature termination codon at position 346, which is predicted to lead to a truncated or absent protein. Loss of function of the TMPRSS6 gene is an established disease mechanism in autosomal recessive iron-refractory iron deficiency anemia. In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic for autosomal recessive iron-refractory iron deficiency anemia. ACMG/AMP Criteria applied: PVS1, PM2_Supporting (Richards 2015). -

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Mar 26, 2022

Observed with a second variant (phase unknown) in an individual with iron-refractory iron deficiency anemia in the literature (Finberg et al., 2008); Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25525159, 25156943, 18408718) -

TMPRSS6-related disorder

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 30, 2023

The TMPRSS6 c.1065C>A variant is predicted to result in premature protein termination (p.Tyr355*). This variant was reported along with a second likely disease-causing TMPRSS6 variant in an individual with iron-refractory iron deficiency anaemia (Finberg KE et al 2008. PubMed ID: 18408718). This variant is reported in 0.0093% of alleles in individuals of African descent in gnomAD. Nonsense variants in TMPRSS6 are expected to be pathogenic. This variant is interpreted as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.56

BayesDel_noAF

Pathogenic

0.57

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Uncertain

0.38

Eigen_PC

Benign

0.20

FATHMM_MKL

Uncertain

0.90

MutationTaster

Benign

1.0

A;A;A;A;A

Vest4

0.81

GERP RS

3.5

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.10

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