NM_017849.4:c.208G>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_017849.4(TMEM127):c.208G>A(p.Asp70Asn) variant causes a missense change. The variant allele was found at a frequency of 0.000133 in 1,611,112 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D70G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00069 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000075 ( 1 hom. )

Consequence

TMEM127
NM_017849.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts P:1B:8

Conservation

PhyloP100: 5.41

Publications

7 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: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.010660887).

BP6

Variant 2-96265174-C-T is Benign according to our data. Variant chr2-96265174-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 126964.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000689 (105/152370) while in subpopulation AFR AF = 0.00248 (103/41590). AF 95% confidence interval is 0.00209. There are 0 homozygotes in GnomAd4. There are 43 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 105 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
TMEM127	NM_017849.4 link	c.208G>A	p.Asp70Asn	missense_variant	Exon 2 of 4	ENST00000258439.8	NP_060319.1
TMEM127	NM_001193304.3 link	c.208G>A	p.Asp70Asn	missense_variant	Exon 2 of 4		NP_001180233.1
TMEM127	NM_001407283.1 link	c.-9+695G>A		intron_variant	Intron 1 of 2		NP_001394212.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMEM127	ENST00000258439.8 link	c.208G>A	p.Asp70Asn	missense_variant	Exon 2 of 4	1	NM_017849.4	ENSP00000258439.3

Frequencies

GnomAD3 genomes

AF:

0.000690

AC:

105

AN:

152252

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00248

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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

GnomAD2 exomes

AF:

0.000200

AC:

AN:

240004

AF XY:

0.000122

show subpopulations

Gnomad AFR exome

AF:

0.00312

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000754

AC:

110

AN:

1458742

Hom.:

Cov.:

AF XY:

0.0000551

AC XY:

AN XY:

725510

show subpopulations

African (AFR)

AF:

0.00263

AC:

AN:

33454

American (AMR)

AF:

0.0000225

AC:

AN:

44540

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26082

East Asian (EAS)

AF:

0.00

AC:

AN:

39668

South Asian (SAS)

AF:

0.0000350

AC:

AN:

85798

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51676

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111456

Other (OTH)

AF:

0.000265

AC:

AN:

60302

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.484

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

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:

0.000689

AC:

105

AN:

152370

Hom.:

Cov.:

AF XY:

0.000577

AC XY:

AN XY:

74518

show subpopulations

African (AFR)

AF:

0.00248

AC:

103

AN:

41590

American (AMR)

AF:

0.0000653

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5192

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68030

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.506

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:

0.000303

Hom.:

Bravo

AF:

0.000710

ESP6500AA

AF:

0.00159

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000322

AC:

ClinVar

Significance: Benign/Likely benign

Submissions summary: Pathogenic:1Benign:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Oct 14, 2022

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Nov 08, 2018

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 28646318, 21156949, 24334765) -

Hereditary cancer-predisposing syndrome

Benign:2

Jan 26, 2021

Sema4, Sema4

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:curation

- -

Jun 05, 2018

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Pheochromocytoma

Pathogenic:1

Familial Cancer Clinic, Veneto Institute of Oncology

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

not specified

Benign:1

May 19, 2021

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: TMEM127 c.208G>A (p.Asp70Asn) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0002 in 240004 control chromosomes, predominantly at a frequency of 0.0031 within the African or African-American subpopulation in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately well above the estimated maximal expected allele frequency for a pathogenic variant in TMEM127 causing Hereditary Paraganglioma-Pheochromocytoma Syndrome phenotype (3.1e-07), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. c.208G>A has been reported in the literature in individuals affected with pheochromocytomas and/or paragangliomas and renal cell carcinoma, without strong evidence for causality (Yao_2010, Qin_2014). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Paraganglioma-Pheochromocytoma Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as benign/likely benign. Based on the evidence outlined above, the variant was classified as likely benign. -

TMEM127-related disorder

Benign:1

Apr 15, 2022

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Hereditary pheochromocytoma-paraganglioma

Benign:1

Feb 04, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.35

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.27

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.019

T;T

Eigen

Uncertain

0.21

Eigen_PC

Uncertain

0.33

FATHMM_MKL

Uncertain

0.85

LIST_S2

Uncertain

0.87

.;D

M_CAP

Uncertain

0.24

MetaRNN

Benign

0.011

T;T

MetaSVM

Benign

-0.54

MutationAssessor

Benign

0.49

N;N

PhyloP100

5.4

PrimateAI

Pathogenic

0.82

PROVEAN

Benign

-0.22

N;N

REVEL

Pathogenic

0.76

Sift

Benign

0.42

T;T

Sift4G

Benign

0.44

T;T

Polyphen

0.88

P;P

Vest4

0.37

MVP

0.71

MPC

0.40

ClinPred

0.040

GERP RS

5.5

Varity_R

0.18

gMVP

0.88

Mutation Taster

=13/87

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over