chr1-156136027-C-T

Variant names:

• chr1-156136027-C-T
• rs267607617
• NM_170707.4:c.1063C>T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_170707.4(LMNA):​c.1063C>T​(p.Gln355*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LMNA NM_170707.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: 7.91

Genes affected

LMNA (HGNC:6636): (lamin A/C) The protein encoded by this gene is part of the nuclear lamina, a two-dimensional matrix of proteins located next to the inner nuclear membrane. The lamin family of proteins make up the matrix and are highly conserved in evolution. During mitosis, the lamina matrix is reversibly disassembled as the lamin proteins are phosphorylated. Lamin proteins are thought to be involved in nuclear stability, chromatin structure and gene expression. Vertebrate lamins consist of two types, A and B. Alternative splicing results in multiple transcript variants. Mutations in this gene lead to several diseases: Emery-Dreifuss muscular dystrophy, familial partial lipodystrophy, limb girdle muscular dystrophy, dilated cardiomyopathy, Charcot-Marie-Tooth disease, and Hutchinson-Gilford progeria syndrome. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-156136027-C-T is Pathogenic according to our data. Variant chr1-156136027-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 66767.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-156136027-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LMNA	NM_170707.4	c.1063C>T	p.Gln355*	stop_gained	Exon 6 of 12	ENST00000368300.9	NP_733821.1
LMNA	NM_005572.4	c.1063C>T	p.Gln355*	stop_gained	Exon 6 of 10	ENST00000677389.1	NP_005563.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LMNA	ENST00000368300.9	c.1063C>T	p.Gln355*	stop_gained	Exon 6 of 12	1	NM_170707.4	ENSP00000357283.4
LMNA	ENST00000677389.1	c.1063C>T	p.Gln355*	stop_gained	Exon 6 of 10		NM_005572.4	ENSP00000503633.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Charcot-Marie-Tooth disease type 2 Pathogenic:1

Jun 16, 2016

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Truncating variants in LMNA are known to be pathogenic (PMID: 23183350). This particular truncation has been reported in the literature in individuals affected with LMNA-related disorders and it has been shown to segregate in two families (PMID: 15539782, 18646565, 15866440). This sequence change creates a premature translational stop signal at codon 355 (p.Gln355*). It is expected to result in an absent or disrupted protein product. -

Dilated cardiomyopathy 1A Pathogenic:1

Oct 10, 2023

Human Genetics Bochum, Ruhr University Bochum

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG criteria used to clasify this variant: PVS1, PM1, PM2_SUP -

not provided Other:1

-

Epithelial Biology; Institute of Medical Biology, Singapore

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	43
DANN	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.92
FATHMM_MKL	Pathogenic	0.97	D
Vest4		0.98
GERP RS		4.8
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		3.8

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: rs267607617; hg19: chr1-156105818;