NM_017849.4:c.217G>C

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PP3_ModerateBS2

The NM_017849.4(TMEM127):c.217G>C(p.Gly73Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000863 in 1,611,434 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G73D) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000092 ( 0 hom. )

Consequence

TMEM127
NM_017849.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts P:1U:7B:1

Conservation

PhyloP100: 7.12

Publications

3 publications found

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 Gene-Disease associations (from GenCC):

hereditary pheochromocytoma-paraganglioma
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
pheochromocytoma
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
renal cell carcinoma
Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp

TMEM127 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.849

BS2

High AC in GnomAd4 at 5 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017849.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TMEM127	NM_017849.4	MANE Select	c.217G>C	p.Gly73Arg	missense	Exon 2 of 4	NP_060319.1
TMEM127	NM_001193304.3		c.217G>C	p.Gly73Arg	missense	Exon 2 of 4	NP_001180233.1
TMEM127	NM_001407283.1		c.-9+704G>C		intron	N/A	NP_001394212.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TMEM127	ENST00000258439.8	TSL:1 MANE Select	c.217G>C	p.Gly73Arg	missense	Exon 2 of 4	ENSP00000258439.3
TMEM127	ENST00000432959.2	TSL:1	c.217G>C	p.Gly73Arg	missense	Exon 2 of 4	ENSP00000416660.1
TMEM127	ENST00000713754.1		n.217G>C		non_coding_transcript_exon	Exon 2 of 4	ENSP00000519055.1

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152262

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:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000372

AC:

AN:

241688

AF XY:

0.0000303

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000832

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000918

AC:

134

AN:

1459172

Hom.:

Cov.:

AF XY:

0.0000758

AC XY:

AN XY:

725764

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33460

American (AMR)

AF:

0.00

AC:

AN:

44590

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26100

East Asian (EAS)

AF:

0.00

AC:

AN:

39678

South Asian (SAS)

AF:

0.00

AC:

AN:

85860

European-Finnish (FIN)

AF:

0.0000193

AC:

AN:

51856

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.000116

AC:

129

AN:

1111546

Other (OTH)

AF:

0.0000663

AC:

AN:

60316

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152262

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74386

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41468

American (AMR)

AF:

0.00

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5208

South Asian (SAS)

AF:

0.00

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10630

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000735

AC:

AN:

68038

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000868

Hom.:

Bravo

AF:

0.0000264

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.0000578

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:7Benign:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Pheochromocytoma

Pathogenic:1Uncertain:3Benign:1

Jul 12, 2023

Baylor Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Familial Cancer Clinic, Veneto Institute of Oncology

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

Mar 07, 2024

St. Jude Molecular Pathology, St. Jude Children's Research Hospital

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The TMEM127 c.217G>C (p.Gly73Arg) missense change has a maximum subpopulation frequency of 0.008% in gnomAD v2.1.1 (https://gnomad.broadinstitute.org). The in silico tool REVEL is inconclusive about a pathogenic or benign effect of this variant on protein function. This variant has been reported in an individual with pheochromocytoma (PMID: 22136840). In summary, the evidence currently available is insufficient to determine the clinical significance of this variant. It has therefore been classified as of uncertain significance.

Jun 01, 2014

CSER _CC_NCGL, University of Washington

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:research

Jan 01, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not provided

Uncertain:2

May 10, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The frequency of this variant in the general population, 0.000081 (10/123534 chromosomes, http://gnomad.broadinstitute.org), is uninformative in assessment of its pathogenicity. In the published literature, the variant has been reported in an individual with pheochromocytoma (PMID: 21156949 (2010)). A published functional study has reported that this variant does not have a deleterious effect on TMEM127 protein localization and expression (PMID: 32575117 (2020)), however additional studies are required to determine the global effect of this variant on TMEM127 protein function. Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is damaging. Based on the available information, we are unable to determine the clinical significance of this variant.

May 14, 2025

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Observed in an individual with pheochromocytoma (PMID: 21156949); Published functional studies demonstrate no damaging effect: cellular localization and protein expression levels similar to wildtype (PMID: 32575117); In silico analysis suggests that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 25637381, 32575117, 33051659, 21156949, 22136840, 37937776)

Hereditary cancer-predisposing syndrome

Uncertain:1

Oct 04, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.G73R variant (also known as c.217G>C), located in coding exon 1 of the TMEM127 gene, results from a G to C substitution at nucleotide position 217. The glycine at codon 73 is replaced by arginine, an amino acid with dissimilar properties. This variant has been detected in an Italian male with an apparently sporadic adrenal paraganglioma diagnosed at age 44 (Yao L et al, JAMA 2010 Dec; 304(23):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. Based on the available evidence, the clinical significance of this variant remains unclear.

Hereditary pheochromocytoma-paraganglioma

Uncertain:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 73 of the TMEM127 protein (p.Gly73Arg). This variant is present in population databases (rs121908820, gnomAD 0.008%). This missense change has been observed in individual(s) with pheochromocytoma (PMID: 21156949). ClinVar contains an entry for this variant (Variation ID: 126965). 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 does not substantially affect TMEM127 function (PMID: 32575117). 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 v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.85

BayesDel_addAF

Pathogenic

0.25

BayesDel_noAF

Pathogenic

0.31

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.057

Eigen

Uncertain

0.43

Eigen_PC

Uncertain

0.46

FATHMM_MKL

Uncertain

0.90

LIST_S2

Uncertain

0.90

M_CAP

Uncertain

0.29

MetaRNN

Pathogenic

0.85

MetaSVM

Uncertain

-0.089

MutationAssessor

Benign

1.5

PhyloP100

7.1

PrimateAI

Pathogenic

0.83

PROVEAN

Benign

-1.9

REVEL

Uncertain

0.63

Sift

Uncertain

0.0070

Sift4G

Benign

0.10

Polyphen

1.0

Vest4

0.94

MVP

0.79

MPC

1.2

ClinPred

0.37

GERP RS

4.6

Varity_R

0.36

gMVP

0.94

Mutation Taster

=10/90

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over