Genetic Variant TMEM256:p.Ser81Arg (chr17-7403165-G-C) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2PP3

The NM_152766.5(TMEM256):c.243C>G(p.Ser81Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000821 in 1,461,886 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

TMEM256
NM_152766.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.92

Publications

0 publications found

Variant links:

Genes affected

TMEM256 (HGNC:28618): (transmembrane protein 256) Located in extracellular exosome. [provided by Alliance of Genome Resources, Apr 2022]

TMEM256 links:

TMEM256-PLSCR3 (HGNC:49186): (TMEM256-PLSCR3 readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring chromosome 17 open reading frame 61 (C17orf61) and phospholipid scramblase 3 (PLSCR3) genes. The read-through transcript is a candidate for nonsense-mediated mRNA decay (NMD), and is unlikely to produce a protein product. [provided by RefSeq, Jan 2011]

TMEM256-PLSCR3 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.751

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_152766.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TMEM256	NM_152766.5	MANE Select	c.243C>G	p.Ser81Arg	missense	Exon 4 of 4	NP_689979.1	Q8N2U0
	TMEM256-PLSCR3	NR_037719.1		n.164+493C>G		intron	N/A

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TMEM256	ENST00000302422.4	TSL:1 MANE Select	c.243C>G	p.Ser81Arg	missense	Exon 4 of 4	ENSP00000301939.3	Q8N2U0
TMEM256-PLSCR3	ENST00000573331.5	TSL:2	n.198+145C>G		intron	N/A	ENSP00000466104.1	K7ERE1
TMEM256	ENST00000959765.1		c.291C>G	p.Ser97Arg	missense	Exon 4 of 4	ENSP00000629824.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000119

AC:

AN:

251442

AF XY:

0.00000736

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000821

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727248

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000812

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112006

Other (OTH)

AF:

0.0000828

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.463

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.:

ExAC

AF:

0.00000824

AC:

Asia WGS

AF:

0.00318

AC:

AN:

3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.96

BayesDel_addAF

Uncertain

0.084

BayesDel_noAF

Uncertain

0.090

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.36

Eigen

Uncertain

0.20

Eigen_PC

Benign

0.19

FATHMM_MKL

Uncertain

0.81

M_CAP

Uncertain

0.092

MetaRNN

Pathogenic

0.75

MetaSVM

Benign

-0.38

MutationAssessor

Pathogenic

3.7

PhyloP100

1.9

PrimateAI

Uncertain

0.53

PROVEAN

Uncertain

-3.1

REVEL

Uncertain

0.63

Sift

Uncertain

0.0060

Sift4G

Uncertain

0.0080

Polyphen

0.40

Vest4

0.71

MutPred

0.63

Gain of methylation at S81 (P = 0.0351)

MVP

0.085

MPC

0.78

ClinPred

0.96

GERP RS

3.2

Varity_R

0.36

gMVP

0.90

Mutation Taster

=71/29

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over