2-96253969-C-G

Position:

chr2-96253969-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1PM2

The NM_017849.4(TMEM127):c.556G>C(p.Ala186Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,154 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

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

Consequence

TMEM127
NM_017849.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 7.41

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 4 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;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
TMEM127	NM_017849.4 linkuse as main transcript	c.556G>C	p.Ala186Pro	missense_variant	4/4	ENST00000258439.8	NP_060319.1
TMEM127	NM_001193304.3 linkuse as main transcript	c.556G>C	p.Ala186Pro	missense_variant	4/4		NP_001180233.1
TMEM127	NM_001407282.1 linkuse as main transcript	c.304G>C	p.Ala102Pro	missense_variant	3/3		NP_001394211.1
TMEM127	NM_001407283.1 linkuse as main transcript	c.304G>C	p.Ala102Pro	missense_variant	3/3		NP_001394212.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
TMEM127	ENST00000258439.8 linkuse as main transcript	c.556G>C	p.Ala186Pro	missense_variant	4/4	1	NM_017849.4	ENSP00000258439	P1
TMEM127	ENST00000432959.1 linkuse as main transcript	c.556G>C	p.Ala186Pro	missense_variant	4/4	1		ENSP00000416660	P1
TMEM127	ENST00000435268.1 linkuse as main transcript	c.304G>C	p.Ala102Pro	missense_variant	3/3	3		ENSP00000411810

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152154

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

Cov.:

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152154

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74344

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:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Pheochromocytoma

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Feb 05, 2024

- -

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 16, 2023

The p.A186P variant (also known as c.556G>C), located in coding exon 3 of the TMEM127 gene, results from a G to C substitution at nucleotide position 556. The alanine at codon 186 is replaced by proline, an amino acid with highly similar properties. This alteration has been identified in multiple individuals diagnosed with pheochromocytoma (Ben Aim L et al. J Med Genet, 2019 Aug;56:513-520; 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. 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. -

Hereditary pheochromocytoma-paraganglioma

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 16, 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: 577865). This missense change has been observed in individual(s) with pheochromocytoma (PMID: 30877234, 33051659). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 186 of the TMEM127 protein (p.Ala186Pro). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.47

BayesDel_noAF

Pathogenic

0.43

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.066

T;T;.

Eigen

Uncertain

0.62

Eigen_PC

Pathogenic

0.70

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.92

.;D;D

M_CAP

Benign

0.076

MetaRNN

Uncertain

0.71

D;D;D

MetaSVM

Pathogenic

0.84

MutationAssessor

Benign

0.55

N;N;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Pathogenic

0.83

PROVEAN

Benign

-2.3

N;N;D

REVEL

Pathogenic

0.67

Sift

Benign

0.10

T;T;T

Sift4G

Benign

0.063

T;T;T

Polyphen

1.0

D;D;.

Vest4

0.79

MutPred

0.45

Loss of helix (P = 0.0138);Loss of helix (P = 0.0138);.;

MVP

0.85

MPC

1.3

ClinPred

0.85

GERP RS

5.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.59

gMVP

0.95

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