rs201192820

Positions:

• chr17-15259185-G-A
• chr17-15259185-G-C
• chr17-15259185-G-T

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_Strong BP6_Very_Strong BP7

The NM_000304.4(PMP22):​c.87C>T​(p.Ile29Ile) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000161 in 1,611,304 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00014 (0 hom., cov: 31)
  • Exomes 𝑓: 0.00016 (0 hom.)
• Consequence: PMP22 NM_000304.4 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: 0.143

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 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.5).
• BP6: Variant 17-15259185-G-A is Benign according to our data. Variant chr17-15259185-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 462782.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-15259185-G-A is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=0.143 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PMP22	NM_000304.4	c.87C>T	p.Ile29Ile	synonymous_variant	3/5	ENST00000312280.9	NP_000295.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PMP22	ENST00000312280.9	c.87C>T	p.Ile29Ile	synonymous_variant	3/5	1	NM_000304.4	ENSP00000308937.3

Frequencies

GnomAD3 genomes AF: 0.000145 AC: 22 AN: 152134 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000196

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000220

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.0000676 AC: 17 AN: 251406 Hom.: 0 AF XY: 0.0000810 AC XY: 11 AN XY: 135872

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000326

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000704

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000163 AC: 238 AN: 1459052 Hom.: 0 Cov.: 30 AF XY: 0.000169 AC XY: 123 AN XY: 726044

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.000112

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000126

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.000200

Gnomad4 OTH exome AF: 0.0000664

GnomAD4 genome AF: 0.000144 AC: 22 AN: 152252 Hom.: 0 Cov.: 31 AF XY: 0.000134 AC XY: 10 AN XY: 74460

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.000196

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000386

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000221

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.0000575 Hom.: 0

Bravo AF: 0.000110

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.000164

EpiControl AF: 0.0000593

ClinVar

Significance: Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Oct 01, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 23, 2020	This variant is associated with the following publications: (PMID: 9888385) -

Charcot-Marie-Tooth disease Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Molecular Genetics Laboratory, London Health Sciences Centre

-

- -

Inborn genetic diseases Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 13, 2023

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

PMP22-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 30, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Charcot-Marie-Tooth disease, type I Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 17, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.50
CADD	Benign	10
DANN	Benign	0.83

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs201192820; hg19: chr17-15162502; COSMIC: COSV56602125; COSMIC: COSV56602125;