Genetic Variant TMEM127:p.Ala132Thr (chr2-96254848-C-T) – ACMG Classification: Benign (-9 pts)

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 2P and 11B. PM1BP4_ModerateBP6BS1BS2

The NM_017849.4(TMEM127):c.394G>A(p.Ala132Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000075 in 1,613,944 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign 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. A132S) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000081 ( 0 hom. )

Consequence

TMEM127
NM_017849.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4

Conservation

PhyloP100: 7.49

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: PanelApp Australia, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
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 -9 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 39 uncertain in NM_017849.4

BP4

Computational evidence support a benign effect (MetaRNN=0.12568802).

BP6

Variant 2-96254848-C-T is Benign according to our data. Variant chr2-96254848-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 186727.

BS1

Variant frequency is greater than expected in population eas. GnomAdExome4 allele frequency = 0.0000814 (119/1461818) while in subpopulation EAS AF = 0.00239 (95/39698). AF 95% confidence interval is 0.002. There are 0 homozygotes in GnomAdExome4. There are 54 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAdExome4 at 119 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	UniProt
TMEM127	NM_017849.4	MANE Select	c.394G>A	p.Ala132Thr	missense	Exon 3 of 4	NP_060319.1	O75204
TMEM127	NM_001193304.3		c.394G>A	p.Ala132Thr	missense	Exon 3 of 4	NP_001180233.1	O75204
TMEM127	NM_001407282.1		c.142G>A	p.Ala48Thr	missense	Exon 2 of 3	NP_001394211.1	C9J4H2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TMEM127	ENST00000258439.8	TSL:1 MANE Select	c.394G>A	p.Ala132Thr	missense	Exon 3 of 4	ENSP00000258439.3	O75204
TMEM127	ENST00000432959.2	TSL:1	c.394G>A	p.Ala132Thr	missense	Exon 3 of 4	ENSP00000416660.1	O75204
TMEM127	ENST00000910913.1		c.394G>A	p.Ala132Thr	missense	Exon 2 of 3	ENSP00000580972.1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152126

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:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000151

AC:

AN:

251438

AF XY:

0.000110

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00201

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000814

AC:

119

AN:

1461818

Hom.:

Cov.:

AF XY:

0.0000743

AC XY:

AN XY:

727218

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33472

American (AMR)

AF:

0.00

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00239

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53416

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5758

European-Non Finnish (NFE)

AF:

0.0000153

AC:

AN:

1111980

Other (OTH)

AF:

0.0000828

AC:

AN:

60386

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.482

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:

0.0000131

AC:

AN:

152126

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74316

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41426

American (AMR)

AF:

0.00

AC:

AN:

15262

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000192

AC:

AN:

5198

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10602

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68016

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

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:

0.0000417

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.000231

AC:

Asia WGS

AF:

0.00115

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Hereditary cancer-predisposing syndrome (1)

Hereditary pheochromocytoma and paraganglioma (1)

not provided (1)

not specified (1)

Pheochromocytoma (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.57

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.12

CADD

Uncertain

(source)

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.063

Eigen

Benign

-0.040

Eigen_PC

Benign

0.16

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.83

M_CAP

Benign

0.080

MetaRNN

Benign

0.13

MetaSVM

Benign

-0.59

MutationAssessor

Benign

1.8

PhyloP100

7.5

PrimateAI

Pathogenic

0.88

PROVEAN

Benign

-1.6

REVEL

Uncertain

0.30

Sift

Benign

0.074

Sift4G

Uncertain

0.056

Polyphen

0.014

Vest4

0.94

MutPred

0.39

Loss of stability (P = 0.1784)

MVP

0.63

MPC

1.0

ClinPred

0.23

GERP RS

4.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.17

gMVP

0.86

Mutation Taster

=71/29

polymorphism

(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

Computational scores

Splicing

Publications

Other links and lift over