Genetic Variant PMP22:p.Ser22Cys (chr17-15260663-G-C) – ACMG Classification: Uncertain_significance (5 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1PM5PP3

The NM_000304.4(PMP22):c.65C>G(p.Ser22Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0000107 in 1,400,130 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 variant affecting the same amino acid position, but resulting in a different missense (i.e. S22F) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

PMP22
NM_000304.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.81

Variant links:

Genes affected

PMP22 (HGNC:9118): (peripheral myelin protein 22) This gene encodes an integral membrane protein that is a major component of myelin in the peripheral nervous system. Studies suggest two alternately used promoters drive tissue-specific expression. Various mutations of this gene are causes of Charcot-Marie-Tooth disease Type IA, Dejerine-Sottas syndrome, and hereditary neuropathy with liability to pressure palsies. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

PMP22 links:

ENSG00000279660 (HGNC:):

ENSG00000279660 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM1

In a transmembrane_region Helical (size 29) in uniprot entity PMP22_HUMAN there are 8 pathogenic changes around while only 0 benign (100%) in NM_000304.4

PM5

Other missense variant is known to change same aminoacid residue: Variant chr17-15260663-G-A is described in Lovd as [Pathogenic].

PP3

MetaRNN computational evidence supports a deleterious effect, 0.783

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PMP22	NM_000304.4 link	c.65C>G	p.Ser22Cys	missense_variant	Exon 2 of 5	ENST00000312280.9	NP_000295.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PMP22	ENST00000312280.9 link	c.65C>G	p.Ser22Cys	missense_variant	Exon 2 of 5	1	NM_000304.4	ENSP00000308937.3		Q01453

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.0000107

AC:

AN:

1400130

Hom.:

Cov.:

AF XY:

0.0000101

AC XY:

AN XY:

690666

show subpopulations

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000139

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.35

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

-0.020

CADD

Pathogenic

DANN

Benign

0.89

DEOGEN2

Pathogenic

0.86

D;D;D;D;D;D;.

Eigen

Uncertain

0.57

Eigen_PC

Uncertain

0.52

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.64

T;.;.;.;.;T;T

M_CAP

Pathogenic

0.39

MetaRNN

Pathogenic

0.78

D;D;D;D;D;D;D

MetaSVM

Uncertain

0.51

MutationAssessor

Benign

2.0

M;M;M;.;.;.;.

PrimateAI

Uncertain

0.74

PROVEAN

Uncertain

-2.7

.;D;D;.;D;.;D

REVEL

Uncertain

0.64

Sift

Uncertain

0.0010

.;D;D;.;T;.;D

Sift4G

Benign

0.11

T;T;T;.;T;.;T

Polyphen

1.0

D;D;D;.;.;.;.

Vest4

0.77

MutPred

0.69

Loss of glycosylation at S22 (P = 0.0174);Loss of glycosylation at S22 (P = 0.0174);Loss of glycosylation at S22 (P = 0.0174);Loss of glycosylation at S22 (P = 0.0174);Loss of glycosylation at S22 (P = 0.0174);Loss of glycosylation at S22 (P = 0.0174);Loss of glycosylation at S22 (P = 0.0174);

MVP

0.71

MPC

1.3

ClinPred

0.87

GERP RS

3.6

Varity_R

0.32

gMVP

0.92

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.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over