1-161305681-C-A

Position:

chr1-161305681-C-A

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_000530.8(MPZ):c.*195G>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00933 in 590,924 control chromosomes in the GnomAD database, including 38 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0082 ( 6 hom., cov: 31)

Exomes 𝑓: 0.0097 ( 32 hom. )

Consequence

MPZ
NM_000530.8 3_prime_UTR

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:6

Conservation

PhyloP100: -1.36

Variant links:

Genes affected

MPZ (HGNC:7225): (myelin protein zero) This gene is specifically expressed in Schwann cells of the peripheral nervous system and encodes a type I transmembrane glycoprotein that is a major structural protein of the peripheral myelin sheath. The encoded protein contains a large hydrophobic extracellular domain and a smaller basic intracellular domain, which are essential for the formation and stabilization of the multilamellar structure of the compact myelin. Mutations in this gene are associated with autosomal dominant form of Charcot-Marie-Tooth disease type 1 (CMT1B) and other polyneuropathies, such as Dejerine-Sottas syndrome (DSS) and congenital hypomyelinating neuropathy (CHN). A recent study showed that two isoforms are produced from the same mRNA by use of alternative in-frame translation termination codons via a stop codon readthrough mechanism. [provided by RefSeq, Oct 2015]

MPZ links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -13 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.85).

BP6

Variant 1-161305681-C-A is Benign according to our data. Variant chr1-161305681-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 293310.We mark this variant Likely_benign, oryginal submissions are: {Benign=5, Likely_benign=1, Uncertain_significance=1}. Variant chr1-161305681-C-A is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.0082 (1243/151548) while in subpopulation NFE AF= 0.0133 (904/67830). AF 95% confidence interval is 0.0126. There are 6 homozygotes in gnomad4. There are 594 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck.

BS2

High AC in GnomAd4 at 1243 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	#exon/exons	MANE
MPZ	NM_000530.8 linkuse as main transcript	c.*195G>T	3_prime_UTR_variant	6/6	ENST00000533357.5
MPZ	NM_001315491.2 linkuse as main transcript	c.*3G>T	3_prime_UTR_variant	6/6
MPZ	XM_017001321.3 linkuse as main transcript	c.675+427G>T	intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MPZ	ENST00000533357.5 linkuse as main transcript	c.*195G>T		3_prime_UTR_variant	6/6	1	NM_000530.8	P1	P25189-1

Frequencies

GnomAD3 genomes

AF:

0.00821

AC:

1243

AN:

151428

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00204

Gnomad AMI

AF:

0.0341

Gnomad AMR

AF:

0.00624

Gnomad ASJ

AF:

0.000865

Gnomad EAS

AF:

0.000195

Gnomad SAS

AF:

0.00147

Gnomad FIN

AF:

0.00989

Gnomad MID

AF:

0.00325

Gnomad NFE

AF:

0.0133

Gnomad OTH

AF:

0.00627

GnomAD4 exome

AF:

0.00971

AC:

4268

AN:

439376

Hom.:

Cov.:

AF XY:

0.00911

AC XY:

2101

AN XY:

230662

show subpopulations

Gnomad4 AFR exome

AF:

0.00238

Gnomad4 AMR exome

AF:

0.00387

Gnomad4 ASJ exome

AF:

0.00104

Gnomad4 EAS exome

AF:

0.0000982

Gnomad4 SAS exome

AF:

0.00186

Gnomad4 FIN exome

AF:

0.0165

Gnomad4 NFE exome

AF:

0.0126

Gnomad4 OTH exome

AF:

0.00962

GnomAD4 genome

AF:

0.00820

AC:

1243

AN:

151548

Hom.:

Cov.:

AF XY:

0.00802

AC XY:

594

AN XY:

74040

show subpopulations

Gnomad4 AFR

AF:

0.00203

Gnomad4 AMR

AF:

0.00623

Gnomad4 ASJ

AF:

0.000865

Gnomad4 EAS

AF:

0.000195

Gnomad4 SAS

AF:

0.00126

Gnomad4 FIN

AF:

0.00989

Gnomad4 NFE

AF:

0.0133

Gnomad4 OTH

AF:

0.00669

Alfa

AF:

0.00443

Hom.:

Bravo

AF:

0.00777

Asia WGS

AF:

0.000867

AC:

AN:

3476

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:6

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Neuropathy, congenital hypomyelinating, 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Roussy-Lévy syndrome

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Charcot-Marie-Tooth disease type 1B

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

MPZ-related disorder

Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

May 02, 2019

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

not provided

Benign:1

Benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Apr 01, 2024

MPZ: BS1, BS2 -

Charcot-Marie-Tooth disease dominant intermediate D

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Charcot-Marie-Tooth disease type 4E

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.85

CADD

Benign

2.2

DANN

Benign

0.64

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over