8-143924168-G-A

Position:

• chr8-143924168-G-A

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM2 BP4_Strong BP6 BS1

The NM_201384.3(PLEC):​c.5761C>T​(p.Arg1921Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000134 in 1,598,984 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1921L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00016 (0 hom., cov: 34)
  • Exomes 𝑓: 0.00013 (1 hom.)
• Consequence: PLEC NM_201384.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:2
• Conservation: PhyloP100: 1.40

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 These names were superseded by plectin.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 Benign. Variant got -7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.011765301).
• BP6: Variant 8-143924168-G-A is Benign according to our data. Variant chr8-143924168-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 211914.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=3, Benign=1}.
• BS1: Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000164 (25/152216) while in subpopulation EAS AF= 0.00446 (23/5158). AF 95% confidence interval is 0.00305. There are 0 homozygotes in gnomad4. There are 9 alleles in male gnomad4 subpopulation. Median coverage is 34. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PLEC	NM_201384.3	c.5761C>T	p.Arg1921Trp	missense_variant	31/32	ENST00000345136.8
PLEC	NM_201378.4	c.5719C>T	p.Arg1907Trp	missense_variant	31/32	ENST00000356346.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PLEC	ENST00000345136.8	c.5761C>T	p.Arg1921Trp	missense_variant	31/32	1	NM_201384.3
PLEC	ENST00000356346.7	c.5719C>T	p.Arg1907Trp	missense_variant	31/32	1	NM_201378.4

Frequencies

GnomAD3 genomes AF: 0.000164 AC: 25 AN: 152098 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00445

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000943

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000412 AC: 95 AN: 230422 Hom.: 0 AF XY: 0.000330 AC XY: 42 AN XY: 127148

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00480

Gnomad SAS exome AF: 0.0000328

Gnomad FIN exome AF: 0.000159

Gnomad NFE exome AF: 0.0000664

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000131 AC: 190 AN: 1446768 Hom.: 1 Cov.: 73 AF XY: 0.000122 AC XY: 88 AN XY: 720340

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00365

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.0000767

Gnomad4 NFE exome AF: 0.0000270

Gnomad4 OTH exome AF: 0.000166

GnomAD4 genome AF: 0.000164 AC: 25 AN: 152216 Hom.: 0 Cov.: 34 AF XY: 0.000121 AC XY: 9 AN XY: 74438

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00446

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000943

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000276 Hom.: 0

Bravo AF: 0.000162

ExAC AF: 0.000340 AC: 41

Asia WGS AF: 0.000578 AC: 2 AN: 3474

EpiCase AF: 0.0000545

EpiControl AF: 0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	May 04, 2017	- -

not specified Uncertain:1 Benign:1

Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Sep 09, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Dec 19, 2014	- -

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 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 15, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Uncertain	-0.050
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.41	.;.;.;.;T;.;.;.;.
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.32	D
MetaRNN	Benign	0.012	T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.62	D
MutationAssessor	Uncertain	2.2	.;.;.;.;M;.;.;.;.
MutationTaster	Benign	0.99	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.50	T
PROVEAN	Uncertain	-2.7	D;D;D;D;D;D;D;D;D
REVEL	Uncertain	0.53
Sift	Pathogenic	0.0	D;D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.0020	D;D;D;D;D;D;D;D;D
Polyphen		1.0	D;D;D;D;D;D;D;D;.
Vest4		0.61
MutPred		0.28		.;.;.;.;Loss of disorder (P = 0.0425);.;.;.;.;
MVP		0.79
ClinPred		0.15	T
GERP RS		4.3
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		3.7
Varity_R		0.12
gMVP		0.67

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: rs201278290; hg19: chr8-144998336;