8-143950291-A-C

Variant names:

• chr8-143950291-A-C
• rs201910266
• ENST00000322810.8:c.416T>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_201380.4(PLEC):​c.416T>G​(p.Val139Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000705 in 1,418,444 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V139A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: PLEC NM_201380.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.903
• Publications: 0 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 These names were superseded by plectin.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: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.090577155).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_201380.4. 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_201378.4	MANE Plus Clinical	c.71-11599T>G		intron	N/A	NP_958780.1	Q15149-9
	PLEC	NM_201380.4		c.416T>G	p.Val139Gly	missense	Exon 1 of 32	NP_958782.1	Q15149-1
	PLEC	NM_000445.5		c.194-11599T>G		intron	N/A	NP_000436.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PLEC	ENST00000322810.8	TSL:1	c.416T>G	p.Val139Gly	missense	Exon 1 of 32	ENSP00000323856.4	Q15149-1
	PLEC	ENST00000356346.7	TSL:1 MANE Plus Clinical	c.71-11599T>G		intron	N/A	ENSP00000348702.3	Q15149-9
	PLEC	ENST00000436759.6	TSL:1	c.194-11599T>G		intron	N/A	ENSP00000388180.2	Q15149-2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.05e-7 AC: 1 AN: 1418444 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 701428

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 32686

American (AMR) AF: 0.00 AC: 0 AN: 37666

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25358

East Asian (EAS) AF: 0.00 AC: 0 AN: 37564

South Asian (SAS) AF: 0.00 AC: 0 AN: 81152

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49230

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5714

European-Non Finnish (NFE) AF: 9.17e-7 AC: 1 AN: 1090354

Other (OTH) AF: 0.00 AC: 0 AN: 58720

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.073
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	7.6
DANN	Benign	0.93
DEOGEN2	Benign	0.054	T
Eigen	Benign	-0.67
Eigen_PC	Benign	-0.58
FATHMM_MKL	Benign	0.052	N
LIST_S2	Benign	0.37	T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.091	T
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	-0.14	N
PhyloP100		-0.90
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-0.35	N
REVEL	Benign	0.10
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.021	D
Polyphen		0.0	B
Vest4		0.14
MutPred		0.24		Loss of stability (P = 0.002)
MVP		0.20
ClinPred		0.21	T
GERP RS		2.2
Varity_R		0.061
gMVP		0.53
Mutation Taster		=94/6	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: rs201910266; hg19: chr8-145024459;