rs782743395

Positions:

• chr8-143922125-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_201384.3(PLEC):​c.7696G>A​(p.Val2566Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000383 in 1,542,322 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 34)
  • Exomes 𝑓: 0.000037 (0 hom.)
• Consequence: PLEC NM_201384.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 2.88

Genes affected

PLEC (HGNC:9069): (plectin) Plectin is a prominent member of an important family of structurally and in part functionally related proteins, termed plakins or cytolinkers, that are capable of interlinking different elements of the cytoskeleton. Plakins, with their multi-domain structure and enormous size, not only play crucial roles in maintaining cell and tissue integrity and orchestrating dynamic changes in cytoarchitecture and cell shape, but also serve as scaffolding platforms for the assembly, positioning, and regulation of signaling complexes (reviewed in PMID: 9701547, 11854008, and 17499243). Plectin is expressed as several protein isoforms in a wide range of cell types and tissues from a single gene located on chromosome 8 in humans (PMID: 8633055, 8698233). Until 2010, this locus was named plectin 1 (symbol PLEC1 in human; Plec1 in mouse and rat) and the gene product had been referred to as "hemidesmosomal protein 1" or "plectin 1, intermediate filament binding 500kDa". These names were superseded by plectin. The plectin gene locus in mouse on chromosome 15 has been analyzed in detail (PMID: 10556294, 14559777), revealing a genomic exon-intron organization with well over 40 exons spanning over 62 kb and an unusual 5' transcript complexity of plectin isoforms. Eleven exons (1-1j) have been identified that alternatively splice directly into a common exon 2 which is the first exon to encode plectin's highly conserved actin binding domain (ABD). Three additional exons (-1, 0a, and 0) splice into an alternative first coding exon (1c), and two additional exons (2alpha and 3alpha) are optionally spliced within the exons encoding the acting binding domain (exons 2-8). Analysis of the human locus has identified eight of the eleven alternative 5' exons found in mouse and rat (PMID: 14672974); exons 1i, 1j and 1h have not been confirmed in human. Furthermore, isoforms lacking the central rod domain encoded by exon 31 have been detected in mouse (PMID:10556294), rat (PMID: 9177781), and human (PMID: 11441066, 10780662, 20052759). The short alternative amino-terminal sequences encoded by the different first exons direct the targeting of the various isoforms to distinct subcellular locations (PMID: 14559777). As the expression of specific plectin isoforms was found to be dependent on cell type (tissue) and stage of development (PMID: 10556294, 12542521, 17389230) it appears that each cell type (tissue) contains a unique set (proportion and composition) of plectin isoforms, as if custom-made for specific requirements of the particular cells. Concordantly, individual isoforms were found to carry out distinct and specific functions (PMID: 14559777, 12542521, 18541706). In 1996, a number of groups reported that patients suffering from epidermolysis bullosa simplex with muscular dystrophy (EBS-MD) lacked plectin expression in skin and muscle tissues due to defects in the plectin gene (PMID: 8698233, 8941634, 8636409, 8894687, 8696340). Two other subtypes of plectin-related EBS have been described: EBS-pyloric atresia (PA) and EBS-Ogna. For reviews of plectin-related diseases see PMID: 15810881, 19945614. Mutations in the plectin gene related to human diseases should be named based on the position in NM_000445 (variant 1, isoform 1c), unless the mutation is located within one of the other alternative first exons, in which case the position in the respective Reference Sequence should be used. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.05397442).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PLEC	NM_201384.3	c.7696G>A	p.Val2566Met	missense_variant	32/32	ENST00000345136.8	NP_958786.1
PLEC	NM_201378.4	c.7654G>A	p.Val2552Met	missense_variant	32/32	ENST00000356346.7	NP_958780.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PLEC	ENST00000345136.8	c.7696G>A	p.Val2566Met	missense_variant	32/32	1	NM_201384.3	ENSP00000344848.3
PLEC	ENST00000356346.7	c.7654G>A	p.Val2552Met	missense_variant	32/32	1	NM_201378.4	ENSP00000348702.3

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152180 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.0000724

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: 0.0000588

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.0000705 AC: 10 AN: 141920 Hom.: 0 AF XY: 0.0000647 AC XY: 5 AN XY: 77276

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000161

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000895

Gnomad SAS exome AF: 0.0000426

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000714

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000367 AC: 51 AN: 1390142 Hom.: 0 Cov.: 80 AF XY: 0.0000349 AC XY: 24 AN XY: 687020

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000110

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000550

Gnomad4 SAS exome AF: 0.0000124

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000379

Gnomad4 OTH exome AF: 0.0000517

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152180 Hom.: 0 Cov.: 34 AF XY: 0.0000673 AC XY: 5 AN XY: 74346

Gnomad4 AFR AF: 0.0000724

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000588

Gnomad4 OTH AF: 0.000478

Alfa AF: 0.000108 Hom.: 0

Bravo AF: 0.0000529

ExAC AF: 0.0000546 AC: 6

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Aug 18, 2017	The V2593M variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The V2593M variant is not observed at a significant frequency in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). This variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. This substitution occurs at a position where amino acids with similar properties to Valine are tolerated across species. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jun 14, 2020	- -

Epidermolysis bullosa simplex, Ogna type;C2677349:Epidermolysis bullosa simplex 5C, with pyloric atresia;C2931072:Epidermolysis bullosa simplex 5B, with muscular dystrophy;C3150989:Autosomal recessive limb-girdle muscular dystrophy type 2Q;C4225309:Epidermolysis bullosa simplex with nail dystrophy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 24, 2023

This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 2593 of the PLEC protein (p.Val2593Met). This variant is present in population databases (rs782743395, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with PLEC-related conditions. ClinVar contains an entry for this variant (Variation ID: 451333). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt PLEC protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	18
DANN	Benign	0.94
DEOGEN2	Benign	0.060	.;.;.;.;T;.;.;.;.;.
Eigen	Benign	-0.082
Eigen_PC	Benign	0.012
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Uncertain	0.95	D;D;D;D;D;D;D;D;D;D
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.054	T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.47	T
MutationAssessor	Benign	1.3	.;.;.;.;L;.;.;.;.;.
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-0.36	N;N;N;N;N;N;N;N;.;N
REVEL	Benign	0.22
Sift	Benign	0.32	T;T;T;T;T;T;T;T;.;T
Sift4G	Benign	0.66	T;T;T;T;T;T;T;T;.;T
Polyphen		0.63	P;P;P;P;P;P;P;P;.;.
Vest4		0.31
MutPred		0.29		.;.;.;.;Loss of MoRF binding (P = 0.1076);.;.;.;.;.;
MVP		0.72
ClinPred		0.046	T
GERP RS		3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.090
gMVP		0.37

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

Other links and lift over

dbSNP: rs782743395; hg19: chr8-144996293;