rs121908818

Positions:

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1PM2PP3_Strong

The NM_017849.4(TMEM127):c.158G>C(p.Trp53Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000125 in 1,603,718 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

TMEM127
NM_017849.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2

Conservation

PhyloP100: 5.33

Variant links:

Genes affected

TMEM127 (HGNC:26038): (transmembrane protein 127) This gene encodes a transmembrane protein with four predicted transmembrane domains. The protein is associated with a subpopulation of vesicular organelles corresponding to early endosomal structures, with the Golgi, and with lysosomes, and may participate in protein trafficking between these structures. Mutations in this gene and several other genes cause pheochromocytomas. Alternatively spliced transcript variants encoding the same protein have been identified. [provided by RefSeq, Aug 2022]

TMEM127 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PM1

In a chain Transmembrane protein 127 (size 237) in uniprot entity TM127_HUMAN there are 6 pathogenic changes around while only 2 benign (75%) in NM_017849.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.944

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TMEM127	NM_017849.4 linkuse as main transcript	c.158G>C	p.Trp53Ser	missense_variant	2/4	ENST00000258439.8	NP_060319.1	O75204
TMEM127	NM_001193304.3 linkuse as main transcript	c.158G>C	p.Trp53Ser	missense_variant	2/4		NP_001180233.1	O75204
TMEM127	NM_001407283.1 linkuse as main transcript	c.-9+645G>C		intron_variant			NP_001394212.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TMEM127	ENST00000258439.8 linkuse as main transcript	c.158G>C	p.Trp53Ser	missense_variant	2/4	1	NM_017849.4	ENSP00000258439.3		O75204
TMEM127	ENST00000432959.1 linkuse as main transcript	c.158G>C	p.Trp53Ser	missense_variant	2/4	1		ENSP00000416660.1		O75204

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152254

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

6.89e-7

AC:

AN:

1451464

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

721704

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

9.01e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152254

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74384

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Pheochromocytoma

Pathogenic:1Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 27, 2024	- -
Likely pathogenic, no assertion criteria provided	literature only	Familial Cancer Clinic, Veneto Institute of Oncology	-	- -

Hereditary cancer-predisposing syndrome

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 25, 2024

The p.W53S variant (also known as c.158G>C), located in coding exon 1 of the TMEM127 gene, results from a G to C substitution at nucleotide position 158. The tryptophan at codon 53 is replaced by serine, an amino acid with highly dissimilar properties. This variant has been observed in multiple individuals with a personal and/or family history of pheochromocytoma (Ambry internal data; Yao L et al. JAMA, 2010 Dec;304:2611-9). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Hereditary pheochromocytoma-paraganglioma

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 10, 2023

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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 126963). This missense change has been observed in individual(s) with pheochromocytomas and/or paragangliomas (PMID: 21156949, 22136840). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces tryptophan, which is neutral and slightly polar, with serine, which is neutral and polar, at codon 53 of the TMEM127 protein (p.Trp53Ser). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.37

BayesDel_noAF

Pathogenic

0.29

CADD

Pathogenic

DANN

Uncertain

0.98

DEOGEN2

Benign

0.35

T;T

Eigen

Uncertain

0.41

Eigen_PC

Uncertain

0.52

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.82

.;T

M_CAP

Pathogenic

0.31

MetaRNN

Pathogenic

0.94

D;D

MetaSVM

Uncertain

-0.21

MutationAssessor

Benign

2.0

M;M

PrimateAI

Pathogenic

0.85

PROVEAN

Pathogenic

-11

D;D

REVEL

Pathogenic

0.77

Sift

Uncertain

0.014

D;D

Sift4G

Uncertain

0.010

D;D

Polyphen

0.72

P;P

Vest4

0.95

MVP

0.85

MPC

1.2

ClinPred

1.0

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.91

gMVP

0.98

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