chr8-143924905-C-T

Variant names:

• chr8-143924905-C-T
• rs370569372
• NM_201384.3:c.5024G>A

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_Moderate BP6 BS1 BS2

The NM_201384.3(PLEC):​c.5024G>A​(p.Arg1675Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00104 in 1,585,642 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict 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. R1675W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00064 (2 hom., cov: 35)
  • Exomes 𝑓: 0.0011 (0 hom.)
• Consequence: PLEC NM_201384.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:5
• Conservation: PhyloP100: 1.46
• Publications: 2 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 These names were superseded by plectin.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):

• PLEC-related muscular dystrophy-epidermolysis bullosa simplex spectrum disorder

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• 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), Genomics England PanelApp, Orphanet
• autosomal recessive limb-girdle muscular dystrophy type 2Q

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, G2P
• 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: Genomics England PanelApp, Orphanet
• epidermolysis bullosa simplex 5C, with pyloric atresia

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp
• 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 -11 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.13119397).
• BP6: Variant 8-143924905-C-T is Benign according to our data. Variant chr8-143924905-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 196748.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000644 (98/152150) while in subpopulation NFE AF = 0.00119 (81/67980). AF 95% confidence interval is 0.000982. There are 2 homozygotes in GnomAd4. There are 44 alleles in the male GnomAd4 subpopulation. Median coverage is 35. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 2 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_201384.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PLEC	NM_201384.3	MANE Select	c.5024G>A	p.Arg1675Gln	missense	Exon 31 of 32	NP_958786.1	Q15149-4
	PLEC	NM_201378.4	MANE Plus Clinical	c.4982G>A	p.Arg1661Gln	missense	Exon 31 of 32	NP_958780.1	Q15149-9
	PLEC	NM_201380.4		c.5435G>A	p.Arg1812Gln	missense	Exon 31 of 32	NP_958782.1	Q15149-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PLEC	ENST00000345136.8	TSL:1 MANE Select	c.5024G>A	p.Arg1675Gln	missense	Exon 31 of 32	ENSP00000344848.3	Q15149-4
	PLEC	ENST00000356346.7	TSL:1 MANE Plus Clinical	c.4982G>A	p.Arg1661Gln	missense	Exon 31 of 32	ENSP00000348702.3	Q15149-9
	PLEC	ENST00000322810.8	TSL:1	c.5435G>A	p.Arg1812Gln	missense	Exon 31 of 32	ENSP00000323856.4	Q15149-1

Frequencies

GnomAD3 genomes AF: 0.000645 AC: 98 AN: 152036 Hom.: 2 Cov.: 35

Gnomad AFR AF: 0.000242

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000458

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: 0.00119

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000653 AC: 131 AN: 200596 AF XY: 0.000625

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000700

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.000111

Gnomad NFE exome AF: 0.00114

Gnomad OTH exome AF: 0.00116

GnomAD4 exome AF: 0.00108 AC: 1552 AN: 1433492 Hom.: 0 Cov.: 68 AF XY: 0.00102 AC XY: 728 AN XY: 712342

African (AFR) AF: 0.000152 AC: 5 AN: 32990

American (AMR) AF: 0.000640 AC: 28 AN: 43770

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25778

East Asian (EAS) AF: 0.000128 AC: 5 AN: 38916

South Asian (SAS) AF: 0.00 AC: 0 AN: 84314

European-Finnish (FIN) AF: 0.000136 AC: 5 AN: 36682

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5694

European-Non Finnish (NFE) AF: 0.00130 AC: 1438 AN: 1105770

Other (OTH) AF: 0.00119 AC: 71 AN: 59578

GnomAD4 genome AF: 0.000644 AC: 98 AN: 152150 Hom.: 2 Cov.: 35 AF XY: 0.000591 AC XY: 44 AN XY: 74390

African (AFR) AF: 0.000241 AC: 10 AN: 41522

American (AMR) AF: 0.000458 AC: 7 AN: 15298

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5132

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10612

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 292

European-Non Finnish (NFE) AF: 0.00119 AC: 81 AN: 67980

Other (OTH) AF: 0.00 AC: 0 AN: 2108

Alfa AF: 0.000736 Hom.: 0

Bravo AF: 0.000661

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.000778 AC: 3

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000684 AC: 5

ExAC AF: 0.000456 AC: 52

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	4	3	not provided (7)
-	-	1	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 (1)
-	1	-	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;C5676875:Junctional epidermolysis bullosa with pyloric atresia (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.074
BayesDel_addAF	Benign	-0.37	T
BayesDel_noAF	Benign	-0.35
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.054	T
Eigen	Benign	-0.29
Eigen_PC	Benign	-0.15
FATHMM_MKL	Benign	0.53	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.85	D
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-0.72	T
MutationAssessor	Benign	0.69	N
PhyloP100		1.5
PrimateAI	Uncertain	0.79	T
PROVEAN	Benign	-0.31	N
REVEL	Benign	0.11
Sift	Benign	0.24	T
Sift4G	Benign	0.33	T
Polyphen		0.14	B
Vest4		0.34
MVP		0.69
ClinPred		0.034	T
GERP RS		3.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.058
gMVP		0.29
Mutation Taster		=98/2	polymorphism

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: rs370569372; hg19: chr8-144999073;