2-96265246-T-G

Position:

• chr2-96265246-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_017849.4(TMEM127):​c.136A>C​(p.Thr46Pro) variant causes a missense change. The variant allele was found at a frequency of 0.000000693 in 1,443,154 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T46A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TMEM127 NM_017849.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.41

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.784

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TMEM127	NM_017849.4	c.136A>C	p.Thr46Pro	missense_variant	2/4	ENST00000258439.8
TMEM127	NM_001193304.3	c.136A>C	p.Thr46Pro	missense_variant	2/4
TMEM127	NM_001407283.1	c.-9+623A>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TMEM127	ENST00000258439.8	c.136A>C	p.Thr46Pro	missense_variant	2/4	1	NM_017849.4	P1
TMEM127	ENST00000432959.1	c.136A>C	p.Thr46Pro	missense_variant	2/4	1		P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.93e-7 AC: 1 AN: 1443154 Hom.: 0 Cov.: 31 AF XY: 0.00000139 AC XY: 1 AN XY: 717190

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000119

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 22, 2023

The p.T46P variant (also known as c.136A>C), located in coding exon 1 of the TMEM127 gene, results from an A to C substitution at nucleotide position 136. The threonine at codon 46 is replaced by proline, an amino acid with highly similar properties. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.30
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.25	T;T
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.80	D
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.78	D;D
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Benign	1.8	L;L
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.79	T
PROVEAN	Uncertain	-3.7	D;D
REVEL	Pathogenic	0.78
Sift	Uncertain	0.022	D;D
Sift4G	Uncertain	0.058	T;T
Polyphen		0.96	D;D
Vest4		0.69
MutPred		0.57		Loss of helix (P = 0.0558);Loss of helix (P = 0.0558);
MVP		0.78
MPC		0.84
ClinPred		0.97	D
GERP RS		5.6
Varity_R		0.88
gMVP		0.96

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-96930984;