chr8-143918227-C-T

Position:

• chr8-143918227-C-T

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS1

The NM_201384.3(PLEC):​c.11594G>A​(p.Arg3865His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000185 in 1,581,144 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00051 (1 hom., cov: 33)
  • Exomes 𝑓: 0.00015 (1 hom.)
• Consequence: PLEC NM_201384.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:3
• Conservation: PhyloP100: 1.84

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 These names were superseded by plectin.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 -9 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.007147014).
• BP6: Variant 8-143918227-C-T is Benign according to our data. Variant chr8-143918227-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 448049.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=2}. Variant chr8-143918227-C-T is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000506 (77/152262) while in subpopulation AFR AF= 0.000722 (30/41554). AF 95% confidence interval is 0.000519. There are 1 homozygotes in gnomad4. There are 43 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PLEC	NM_201384.3	c.11594G>A	p.Arg3865His	missense_variant	32/32	ENST00000345136.8	NP_958786.1
PLEC	NM_201378.4	c.11552G>A	p.Arg3851His	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.11594G>A	p.Arg3865His	missense_variant	32/32	1	NM_201384.3	ENSP00000344848
PLEC	ENST00000356346.7	c.11552G>A	p.Arg3851His	missense_variant	32/32	1	NM_201378.4	ENSP00000348702

Frequencies

GnomAD3 genomes AF: 0.000506 AC: 77 AN: 152144 Hom.: 1 Cov.: 33

Gnomad AFR AF: 0.000724

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00330

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000147

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000290 AC: 61 AN: 210042 Hom.: 0 AF XY: 0.000332 AC XY: 39 AN XY: 117484

Gnomad AFR exome AF: 0.000547

Gnomad AMR exome AF: 0.0000629

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000345

Gnomad FIN exome AF: 0.00379

Gnomad NFE exome AF: 0.000105

Gnomad OTH exome AF: 0.000563

GnomAD4 exome AF: 0.000151 AC: 216 AN: 1428882 Hom.: 1 Cov.: 56 AF XY: 0.000155 AC XY: 110 AN XY: 709490

Gnomad4 AFR exome AF: 0.000366

Gnomad4 AMR exome AF: 0.0000473

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000118

Gnomad4 FIN exome AF: 0.00428

Gnomad4 NFE exome AF: 0.0000299

Gnomad4 OTH exome AF: 0.000152

GnomAD4 genome AF: 0.000506 AC: 77 AN: 152262 Hom.: 1 Cov.: 33 AF XY: 0.000577 AC XY: 43 AN XY: 74460

Gnomad4 AFR AF: 0.000722

Gnomad4 AMR AF: 0.0000653

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00330

Gnomad4 NFE AF: 0.000147

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000538 Hom.: 0

Bravo AF: 0.000204

ExAC AF: 0.000383 AC: 45

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Aug 09, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Feb 27, 2017	- -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Athena Diagnostics

Aug 19, 2016

- -

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

Oct 30, 2023

- -

PLEC-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Oct 06, 2022

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

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.094
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	19
DANN	Benign	0.86
DEOGEN2	Benign	0.15	.;.;.;.;T;.;.;.;.;.
Eigen	Benign	-0.47
Eigen_PC	Benign	-0.40
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Benign	0.82	T;T;T;T;T;T;T;T;T;T
M_CAP	Benign	0.078	D
MetaRNN	Benign	0.0071	T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.80	T
MutationAssessor	Benign	1.1	.;.;.;.;L;.;.;.;.;.
MutationTaster	Benign	0.51	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-1.8	N;N;N;N;N;N;N;N;.;N
REVEL	Benign	0.11
Sift	Benign	0.063	T;T;T;T;T;T;T;T;.;T
Sift4G	Benign	0.19	T;T;T;T;T;T;T;T;.;T
Polyphen		0.049	B;B;B;B;B;B;B;B;.;.
Vest4		0.53
MVP		0.64
ClinPred		0.030	T
GERP RS		3.3
Varity_R		0.062
gMVP		0.41

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: rs200722246; hg19: chr8-144992395;