rs121908824

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 4P and 4B. PM1PP3_ModerateBS2

The NM_017849.4(TMEM127):c.280C>T(p.Arg94Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000254 in 1,614,114 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 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000022 ( 0 hom. )

Consequence

TMEM127
NM_017849.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts P:1U:5

Conservation

PhyloP100: 2.27

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 Uncertain_significance. Variant got 0 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

PP3

MetaRNN computational evidence supports a deleterious effect, 0.865

BS2

High AC in GnomAd4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
TMEM127	NM_017849.4 linkuse as main transcript	c.280C>T	p.Arg94Trp	missense_variant	3/4	ENST00000258439.8	NP_060319.1
TMEM127	NM_001193304.3 linkuse as main transcript	c.280C>T	p.Arg94Trp	missense_variant	3/4		NP_001180233.1
TMEM127	NM_001407282.1 linkuse as main transcript	c.28C>T	p.Arg10Trp	missense_variant	2/3		NP_001394211.1
TMEM127	NM_001407283.1 linkuse as main transcript	c.28C>T	p.Arg10Trp	missense_variant	2/3		NP_001394212.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
TMEM127	ENST00000258439.8 linkuse as main transcript	c.280C>T	p.Arg94Trp	missense_variant	3/4	1	NM_017849.4	ENSP00000258439	P1
TMEM127	ENST00000432959.1 linkuse as main transcript	c.280C>T	p.Arg94Trp	missense_variant	3/4	1		ENSP00000416660	P1
TMEM127	ENST00000435268.1 linkuse as main transcript	c.28C>T	p.Arg10Trp	missense_variant	2/3	3		ENSP00000411810

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152232

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

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:

0.0000941

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251366

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135864

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000219

AC:

AN:

1461882

Hom.:

Cov.:

AF XY:

0.0000193

AC XY:

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.0000216

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152232

Hom.:

Cov.:

AF XY:

0.0000941

AC XY:

AN XY:

74356

show subpopulations

Gnomad4 AFR

AF:

0.0000965

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000941

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000557

Hom.:

Bravo

AF:

0.0000793

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Pheochromocytoma

Pathogenic:1Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 13, 2024	- -
Likely pathogenic, no assertion criteria provided	literature only	Familial Cancer Clinic, Veneto Institute of Oncology	-	- -

Hereditary cancer-predisposing syndrome

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Jul 26, 2023	The p.R94W variant (also known as c.280C>T), located in coding exon 2 of the TMEM127 gene, results from a C to T substitution at nucleotide position 280. The arginine at codon 94 is replaced by tryptophan, an amino acid with dissimilar properties. This alteration has been identified in individuals with paragangliomas and/or pheochromocytomas (Yao L, et al. JAMA 2010 Dec; 304(23):2611-9; Yonamine M et al. Cancers (Basel), 2021 Aug;13:). A subcellular localization assay performed by Yao, et al. demonstrated aberrant distribution of the mutant protein in the cytoplasm rather than the plasma membrane as observed in wild type protein. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -
Uncertain significance, criteria provided, single submitter	curation	Sema4, Sema4	Jul 06, 2021	- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Dec 22, 2022

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Published functional studies demonstrate protein mislocalization (Yao et al., 2010); This variant is associated with the following publications: (PMID: 21156949, 33051659, 34439168) -

Hereditary pheochromocytoma-paraganglioma

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 24, 2024

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 94 of the TMEM127 protein (p.Arg94Trp). This variant is present in population databases (rs121908824, gnomAD 0.005%). This missense change has been observed in individual(s) with pheochromocytoma (PMID: 21156949). ClinVar contains an entry for this variant (Variation ID: 126967). 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. Experimental studies have shown that this missense change affects TMEM127 function (PMID: 21156949). RNA analysis performed to evaluate the impact of this missense change on mRNA splicing indicates it does not significantly alter splicing (Invitae). 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

Pathogenic

0.93

BayesDel_addAF

Pathogenic

0.25

BayesDel_noAF

Pathogenic

0.29

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.27

T;T;.

Eigen

Benign

-0.14

Eigen_PC

Benign

-0.12

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.96

.;D;D

M_CAP

Uncertain

0.22

MetaRNN

Pathogenic

0.87

D;D;D

MetaSVM

Uncertain

-0.13

MutationAssessor

Benign

1.9

L;L;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Pathogenic

0.88

PROVEAN

Pathogenic

-4.9

D;D;D

REVEL

Pathogenic

0.74

Sift

Uncertain

0.0040

D;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

0.99

D;D;.

Vest4

0.96

MutPred

0.69

Gain of catalytic residue at L92 (P = 0.0028);Gain of catalytic residue at L92 (P = 0.0028);.;

MVP

0.70

MPC

1.1

ClinPred

0.87

GERP RS

2.9

Varity_R

0.34

gMVP

0.93

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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