Genetic Variant MPZ:n.*661_*666dupGAGAGA (chr1-161304965-T-TTCTCTC) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS2

The ENST00000463290.5(MPZ):n.*661_*666dupGAGAGA variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000536 in 149,302 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.000054 ( 0 hom., cov: 26)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

MPZ
ENST00000463290.5 non_coding_transcript_exon

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.360

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

Charcot-Marie-Tooth disease
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
Charcot-Marie-Tooth disease type 1B
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Orphanet
neuropathy, congenital hypomyelinating, 2
Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
autosomal dominant intermediate Charcot-Marie-Tooth disease with neuropathic pain
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Charcot-Marie-Tooth disease dominant intermediate D
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Charcot-Marie-Tooth disease type 2I
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Charcot-Marie-Tooth disease type 2J
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Charcot-Marie-Tooth disease type 3
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

MPZ links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BS2

High AC in GnomAd4 at 8 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein	UniProt
MPZ	NM_000530.8 link	c.905_910dupGAGAGA	3_prime_UTR_variant	Exon 6 of 6	ENST00000533357.5	NP_000521.2	P25189-1
MPZ	NM_001315491.2 link	c.713_718dupGAGAGA	3_prime_UTR_variant	Exon 6 of 6		NP_001302420.1	P25189A0A5F9ZI26
MPZ	XM_017001321.3 link	c.676-630_676-625dupGAGAGA	intron_variant	Intron 5 of 5		XP_016856810.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MPZ	ENST00000533357.5 link	c.905_910dupGAGAGA		3_prime_UTR_variant	Exon 6 of 6	1	NM_000530.8	ENSP00000432943.1		P25189-1

Frequencies

GnomAD3 genomes

AF:

0.0000536

AC:

AN:

149182

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000119

Gnomad OTH

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

636

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

380

African (AFR)

AF:

0.00

AC:

AN:

American (AMR)

AC:

AN:

Ashkenazi Jewish (ASJ)

AC:

AN:

East Asian (EAS)

AF:

0.00

AC:

AN:

140

South Asian (SAS)

AF:

0.00

AC:

AN:

European-Finnish (FIN)

AF:

0.00

AC:

AN:

428

Middle Eastern (MID)

AC:

AN:

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

Other (OTH)

AF:

0.00

AC:

AN:

GnomAD4 genome

AF:

0.0000536

AC:

AN:

149302

Hom.:

Cov.:

AF XY:

0.0000412

AC XY:

AN XY:

72744

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

40682

American (AMR)

AF:

0.00

AC:

AN:

14798

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3448

East Asian (EAS)

AF:

0.00

AC:

AN:

4920

South Asian (SAS)

AF:

0.00

AC:

AN:

4644

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10048

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.000119

AC:

AN:

67498

Other (OTH)

AF:

0.00

AC:

AN:

2064

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.463

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000192

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.36

Splicing

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

Publications

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1-161304965-TTCTC-TTCTCTCTCTC

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over