dbSNP rs201682989: PMP22:c.79-6C>T (chr17-15259199-G-A) – ACMG Classification: Benign (-18 pts)

Variant summary

Our verdict is Benign. The variant received -18 ACMG points: 0P and 18B. BP4_ModerateBP6_Very_StrongBS1BS2

The NM_000304.4(PMP22):c.79-6C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00115 in 1,604,760 control chromosomes in the GnomAD database, including 7 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00087 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0012 ( 7 hom. )

Consequence

PMP22
NM_000304.4 splice_region, intron

Scores

Splicing: ADA: 0.00004068

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:11

Conservation

PhyloP100: 0.857

Publications

0 publications found

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 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

PMP22 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -18 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.44).

BP6

Variant 17-15259199-G-A is Benign according to our data. Variant chr17-15259199-G-A is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 321862.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000867 (132/152278) while in subpopulation SAS AF = 0.00414 (20/4828). AF 95% confidence interval is 0.00274. There are 0 homozygotes in GnomAd4. There are 57 alleles in the male GnomAd4 subpopulation. Median coverage is 31. This position passed quality control check.

BS2

High AC in GnomAd4 at 132 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000304.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
PMP22	NM_000304.4	MANE Select	c.79-6C>T	splice_region intron	N/A	NP_000295.1
PMP22	NM_001281455.2		c.79-6C>T	splice_region intron	N/A	NP_001268384.1
PMP22	NM_001281456.2		c.79-6C>T	splice_region intron	N/A	NP_001268385.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
PMP22	ENST00000312280.9	TSL:1 MANE Select	c.79-6C>T	splice_region intron	N/A	ENSP00000308937.3
PMP22	ENST00000395938.7	TSL:1	c.79-6C>T	splice_region intron	N/A	ENSP00000379269.3
PMP22	ENST00000494511.7	TSL:1	c.-27+5955C>T	intron	N/A	ENSP00000462782.2

Frequencies

GnomAD3 genomes

AF:

0.000854

AC:

130

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000966

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000916

Gnomad ASJ

AF:

0.00490

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00393

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00106

Gnomad OTH

AF:

0.00143

GnomAD2 exomes

AF:

0.00132

AC:

332

AN:

251320

AF XY:

0.00145

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.000521

Gnomad ASJ exome

AF:

0.00486

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00102

Gnomad OTH exome

AF:

0.00114

GnomAD4 exome

AF:

0.00118

AC:

1707

AN:

1452482

Hom.:

Cov.:

AF XY:

0.00132

AC XY:

955

AN XY:

723250

show subpopulations

African (AFR)

AF:

0.0000900

AC:

AN:

33324

American (AMR)

AF:

0.000738

AC:

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00541

AC:

141

AN:

26068

East Asian (EAS)

AF:

0.00

AC:

AN:

39640

South Asian (SAS)

AF:

0.00496

AC:

427

AN:

86032

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53412

Middle Eastern (MID)

AF:

0.00278

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.000904

AC:

998

AN:

1103494

Other (OTH)

AF:

0.00148

AC:

AN:

60038

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

166

248

331

414

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

126

168

210

<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

AF:

0.000867

AC:

132

AN:

152278

Hom.:

Cov.:

AF XY:

0.000765

AC XY:

AN XY:

74466

show subpopulations

African (AFR)

AF:

0.0000963

AC:

AN:

41550

American (AMR)

AF:

0.000915

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00490

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00414

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00107

AC:

AN:

68022

Other (OTH)

AF:

0.00142

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.00131

Hom.:

Bravo

AF:

0.000846

Asia WGS

AF:

0.00231

AC:

AN:

3478

EpiCase

AF:

0.00202

EpiControl

AF:

0.00196

ClinVar

ClinVar submissions as Germline

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

Charcot-Marie-Tooth disease, type I (2)

not specified (2)

Charcot-Marie-Tooth disease (1)

Dejerine-Sottas disease;C0205713:Roussy-Lévy syndrome;C0270911:Charcot-Marie-Tooth disease, type IA;C0393814:Hereditary liability to pressure palsies;C3495591:Charcot-Marie-Tooth disease type 1E;C4083008:Guillain-Barre syndrome, familial (1)

Hereditary liability to pressure palsies (1)

Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.44

CADD

Benign

(source)

DANN

Benign

0.81

PhyloP100

0.86

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000041

dbscSNV1_RF

Benign

0.0060

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

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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

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over