17-15260663-G-C

Variant names:

• chr17-15260663-G-C
• rs104894625
• NM_000304.4:c.65C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 5P and 4B. PM1 PM5 PP3 BS2

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
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.81
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Charcot-Marie-Tooth disease type 1A

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), ClinGen, Laboratory for Molecular Medicine, Ambry Genetics
• hereditary neuropathy with liability to pressure palsies

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
• Charcot-Marie-Tooth disease type 1E

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, PanelApp Australia, Orphanet, Labcorp Genetics (formerly Invitae)
• Charcot-Marie-Tooth disease type 3

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000279660 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_000304.4
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-15260663-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 8445.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.783
• BS2: High AC in GnomAdExome4 at 15 AD gene.

Transcripts

RefSeq

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

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000107 AC: 15 AN: 1400130 Hom.: 0 Cov.: 30 AF XY: 0.0000101 AC XY: 7 AN XY: 690666

African (AFR) AF: 0.00 AC: 0 AN: 31650

American (AMR) AF: 0.00 AC: 0 AN: 35796

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25186

East Asian (EAS) AF: 0.00 AC: 0 AN: 35808

South Asian (SAS) AF: 0.00 AC: 0 AN: 79262

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49340

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5682

European-Non Finnish (NFE) AF: 0.0000139 AC: 15 AN: 1079340

Other (OTH) AF: 0.00 AC: 0 AN: 58066

GnomAD4 genome Cov.: 33

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	D
BayesDel_noAF	Uncertain	-0.020
CADD	Pathogenic	33
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	D
LIST_S2	Benign	0.64	T;.;.;.;.;T;T
M_CAP	Pathogenic	0.39	D
MetaRNN	Pathogenic	0.78	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.51	D
MutationAssessor	Benign	2.0	M;M;M;.;.;.;.
PhyloP100		5.8
PrimateAI	Uncertain	0.74	T
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	D
GERP RS		3.6
PromoterAI		-0.12	Neutral
Varity_R		0.32
gMVP		0.92
Mutation Taster		=10/90	disease causing

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

Other links and lift over

dbSNP: rs104894625; hg19: chr17-15163980;