8-143948489-G-T

Variant names:

• chr8-143948489-G-T
• rs7832643
• NM_201378.4:c.71-9797C>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_201378.4(PLEC):​c.71-9797C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.455 in 152,124 control chromosomes in the GnomAD database, including 17,100 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.45 (17100 hom., cov: 34)
• Consequence: PLEC NM_201378.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.50
• Publications: 32 publications found

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 These names were superseded by plectin.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]

PLEC Gene-Disease associations (from GenCC):

• epidermolysis bullosa simplex

  Inheritance: AD Classification: STRONG Submitted by: G2P
• epidermolysis bullosa simplex 5A, Ogna type

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, PanelApp Australia, Genomics England PanelApp
• autosomal recessive limb-girdle muscular dystrophy type 2Q

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae)
• congenital myasthenic syndrome

  Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
• epidermolysis bullosa simplex 5B, with muscular dystrophy

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Orphanet, Genomics England PanelApp
• epidermolysis bullosa simplex 5C, with pyloric atresia

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• epidermolysis bullosa simplex with nail dystrophy

  Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia
• autosomal recessive limb-girdle muscular dystrophy

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• aplasia cutis congenita

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• cholestasis

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.97).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.644 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PLEC	NM_201378.4	c.71-9797C>A		intron_variant	Intron 1 of 31	ENST00000356346.7	NP_958780.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PLEC	ENST00000356346.7	c.71-9797C>A		intron_variant	Intron 1 of 31	1	NM_201378.4	ENSP00000348702.3

Frequencies

GnomAD3 genomes AF: 0.455 AC: 69091 AN: 152006 Hom.: 17055 Cov.: 34

Gnomad AFR AF: 0.650

Gnomad AMI AF: 0.375

Gnomad AMR AF: 0.364

Gnomad ASJ AF: 0.462

Gnomad EAS AF: 0.160

Gnomad SAS AF: 0.349

Gnomad FIN AF: 0.390

Gnomad MID AF: 0.402

Gnomad NFE AF: 0.397

Gnomad OTH AF: 0.454

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.455 AC: 69176 AN: 152124 Hom.: 17100 Cov.: 34 AF XY: 0.450 AC XY: 33478 AN XY: 74364

African (AFR) AF: 0.650 AC: 26984 AN: 41486

American (AMR) AF: 0.363 AC: 5555 AN: 15294

Ashkenazi Jewish (ASJ) AF: 0.462 AC: 1602 AN: 3470

East Asian (EAS) AF: 0.160 AC: 828 AN: 5172

South Asian (SAS) AF: 0.348 AC: 1681 AN: 4826

European-Finnish (FIN) AF: 0.390 AC: 4138 AN: 10598

Middle Eastern (MID) AF: 0.418 AC: 123 AN: 294

European-Non Finnish (NFE) AF: 0.397 AC: 26972 AN: 67960

Other (OTH) AF: 0.450 AC: 951 AN: 2112

Alfa AF: 0.336 Hom.: 1247

Bravo AF: 0.459

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.97
CADD	Benign	0.46
DANN	Benign	0.48
PhyloP100		-2.5
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		3.6
Mutation Taster		=100/0	polymorphism (auto)

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

Other links and lift over

dbSNP: rs7832643; hg19: chr8-145022657;