chr2-96254844-T-C

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PP3PP5BS2

The NM_017849.4(TMEM127):c.398A>G(p.His133Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000143 in 1,613,988 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H133Y) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

TMEM127
NM_017849.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 7.59

Publications

1 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, 0.821

PP5

Variant 2-96254844-T-C is Pathogenic according to our data. Variant chr2-96254844-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 142056.

BS2

High AC in GnomAdExome4 at 19 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMEM127	NM_017849.4 link	c.398A>G	p.His133Arg	missense_variant	Exon 3 of 4	ENST00000258439.8	NP_060319.1	O75204
TMEM127	NM_001193304.3 link	c.398A>G	p.His133Arg	missense_variant	Exon 3 of 4		NP_001180233.1	O75204
TMEM127	NM_001407282.1 link	c.146A>G	p.His49Arg	missense_variant	Exon 2 of 3		NP_001394211.1
TMEM127	NM_001407283.1 link	c.146A>G	p.His49Arg	missense_variant	Exon 2 of 3		NP_001394212.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMEM127	ENST00000258439.8 link	c.398A>G	p.His133Arg	missense_variant	Exon 3 of 4	1	NM_017849.4	ENSP00000258439.3		O75204

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000159

AC:

AN:

251442

AF XY:

0.0000221

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:

0.0000462

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000130

AC:

AN:

1461816

Hom.:

Cov.:

AF XY:

0.0000138

AC XY:

AN XY:

727206

show subpopulations

African (AFR)

AF:

0.0000597

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.000174

AC:

AN:

5758

European-Non Finnish (NFE)

AF:

0.0000126

AC:

AN:

1111972

Other (OTH)

AF:

0.00

AC:

AN:

60382

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

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:

0.0000263

AC:

AN:

152172

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74334

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41454

American (AMR)

AF:

0.00

AC:

AN:

15276

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.0000942

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68024

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.538

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Pathogenic:1

Dec 17, 2024

Ambry Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.H133R variant (also known as c.398A>G), located in coding exon 2 of the TMEM127 gene, results from an A to G substitution at nucleotide position 398. The histidine at codon 133 is replaced by arginine, an amino acid with highly similar properties. This alteration has been observed in multiple individuals with a personal and/or family history that is consistent with TMEM127-related disease, including one individual with bilateral pheochromocytomas and another individual with a pheochromocytoma diagnosed under age 50 (Ambry internal data; Winzeler B et al. Clin Endocrinol (Oxf), 2021 Dec;:; Armaiz-Pena G et al. J Clin Endocrinol Metab, 2021 Jan;106:e350-e364). This amino acid position is highly conserved in available vertebrate species. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Hereditary pheochromocytoma-paraganglioma

Pathogenic:1

Nov 19, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 133 of the TMEM127 protein (p.His133Arg). This variant is present in population databases (rs587782203, gnomAD 0.004%). This missense change has been observed in individuals with clinical features of paraganglioma-pheochromocytoma syndromes (PMID: 33051659; internal data). ClinVar contains an entry for this variant (Variation ID: 142056). 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. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Pheochromocytoma

Uncertain:1

Mar 28, 2024

Baylor Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Pheochromocytoma, susceptibility to

Uncertain:1

Dec 04, 2015

Knight Diagnostic Laboratories, Oregon Health and Sciences University

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.34

BayesDel_noAF

Pathogenic

0.31

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.23

T;T;.

Eigen

Uncertain

0.51

Eigen_PC

Uncertain

0.59

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.89

.;D;D

M_CAP

Benign

0.070

MetaRNN

Pathogenic

0.82

D;D;D

MetaSVM

Uncertain

-0.057

MutationAssessor

Benign

1.4

L;L;.

PhyloP100

7.6

PrimateAI

Pathogenic

0.91

PROVEAN

Uncertain

-2.6

D;D;D

REVEL

Pathogenic

0.69

Sift

Benign

0.039

D;D;T

Sift4G

Uncertain

0.021

D;D;D

Polyphen

0.96

D;D;.

Vest4

0.96

MutPred

0.50

Gain of MoRF binding (P = 0.0291);Gain of MoRF binding (P = 0.0291);.;

MVP

0.74

MPC

0.96

ClinPred

0.58

GERP RS

5.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.34

gMVP

0.96

Mutation Taster

=21/79

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over