Genetic Variant TMEM127:p.Tyr74Phe (chr2-96265161-T-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The NM_017849.4(TMEM127):c.221A>T(p.Tyr74Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,406 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y74C) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

TMEM127
NM_017849.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.19

Publications

0 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:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 35 uncertain in NM_017849.4

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.20822182).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMEM127	NM_017849.4 link	c.221A>T	p.Tyr74Phe	missense_variant	Exon 2 of 4	ENST00000258439.8	NP_060319.1	O75204
TMEM127	NM_001193304.3 link	c.221A>T	p.Tyr74Phe	missense_variant	Exon 2 of 4		NP_001180233.1	O75204
TMEM127	NM_001407283.1 link	c.-9+708A>T		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.221A>T	p.Tyr74Phe	missense_variant	Exon 2 of 4	1	NM_017849.4	ENSP00000258439.3		O75204

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459406

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

725892

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33456

American (AMR)

AF:

0.00

AC:

AN:

44610

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26102

East Asian (EAS)

AF:

0.00

AC:

AN:

39684

South Asian (SAS)

AF:

0.00

AC:

AN:

85902

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51940

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111624

Other (OTH)

AF:

0.00

AC:

AN:

60322

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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.059

BayesDel_addAF

Uncertain

0.064

BayesDel_noAF

Benign

-0.15

CADD

Benign

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.20

T;T

Eigen

Benign

-0.26

Eigen_PC

Benign

-0.093

FATHMM_MKL

Uncertain

0.80

LIST_S2

Benign

0.78

.;T

M_CAP

Benign

0.038

MetaRNN

Benign

0.21

T;T

MetaSVM

Benign

-0.70

MutationAssessor

Benign

1.4

L;L

PhyloP100

2.2

PrimateAI

Uncertain

0.65

PROVEAN

Benign

-2.0

N;N

REVEL

Uncertain

0.32

Sift

Benign

0.11

T;T

Sift4G

Benign

0.65

T;T

Polyphen

0.11

B;B

Vest4

0.24

MutPred

0.38

Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);

MVP

0.37

MPC

0.39

ClinPred

0.44

GERP RS

4.3

Varity_R

0.20

gMVP

0.67

Mutation Taster

=76/24

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over