1-156136036-G-A

Position:

• chr1-156136036-G-A

Variant summary

Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_170707.4(LMNA):​c.1072G>A​(p.Glu358Lys) variant causes a missense 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. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E358G) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LMNA NM_170707.4 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:10 O:1
• Conservation: PhyloP100: 10.0

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]

LMNA (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 19 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 12 uncertain in NM_170707.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-156136037-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 265834.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), LMNA. . Gene score misZ 2.3673 (greater than the threshold 3.09). Trascript score misZ 3.0905 (greater than threshold 3.09). GenCC has associacion of gene with familial partial lipodystrophy, Dunnigan type, autosomal recessive Emery-Dreifuss muscular dystrophy, LMNA-related cardiocutaneous progeria syndrome, atrioventricular block, dilated cardiomyopathy 1A, Emery-Dreifuss muscular dystrophy 2, autosomal dominant, atypical Werner syndrome, restrictive dermopathy 1, autosomal semi-dominant severe lipodystrophic laminopathy, Emery-Dreifuss muscular dystrophy 3, autosomal recessive, dilated cardiomyopathy, Charcot-Marie-Tooth disease type 2B1, dilated cardiomyopathy-hypergonadotropic hypogonadism syndrome, arrhythmogenic right ventricular cardiomyopathy, familial isolated dilated cardiomyopathy, mandibuloacral dysplasia with type A lipodystrophy, autosomal dominant Emery-Dreifuss muscular dystrophy, heart-hand syndrome, Slovenian type, congenital muscular dystrophy due to LMNA mutation, lethal restrictive dermopathy, Hutchinson-Gilford progeria syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.972
• PP5: Variant 1-156136036-G-A is Pathogenic according to our data. Variant chr1-156136036-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 14525.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-156136036-G-A is described in Lovd as [Pathogenic]. Variant chr1-156136036-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LMNA	NM_170707.4	c.1072G>A	p.Glu358Lys	missense_variant	6/12	ENST00000368300.9	NP_733821.1
LMNA	NM_005572.4	c.1072G>A	p.Glu358Lys	missense_variant	6/10	ENST00000677389.1	NP_005563.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LMNA	ENST00000368300.9	c.1072G>A	p.Glu358Lys	missense_variant	6/12	1	NM_170707.4	ENSP00000357283.4
LMNA	ENST00000677389.1	c.1072G>A	p.Glu358Lys	missense_variant	6/10		NM_005572.4	ENSP00000503633.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:10 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:4 Other:1

not provided, no classification provided	literature only	Epithelial Biology; Institute of Medical Biology, Singapore	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Oct 04, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Johns Hopkins Genomics, Johns Hopkins University	May 23, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Nov 19, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Clinical Genetics Laboratory, Skane University Hospital Lund	May 27, 2022	- -

Emery-Dreifuss muscular dystrophy 2, autosomal dominant Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Aug 01, 2008	- -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory of Medical Genetics, National & Kapodistrian University of Athens	Oct 01, 2021	PM1, PM2, PP2, PP3, PP5 -

Muscular dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Feb 08, 2013

- -

Emery-Dreifuss muscular dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

May 12, 2021

Variant summary: LMNA c.1072G>A (p.Glu358Lys) results in a conservative amino acid change located in the rod domain (IPR039008) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251348 control chromosomes (gnomAD). c.1072G>A has been reported in the literature (usually as a de novo variant) in several individuals affected with typical- and atypical forms of Autosomal Dominant Emery-Dreifuss Muscular Dystrophy, with- or without cardiac involvement (see e.g. Mercuri_2004, Quijano-Roy_2008, van Rijsingen_2013, Pasqualin_2014, Fan_2021); in general most of the patients had muscle involvement, but the onset, severity, distribution of muscle weakness, and presence of associated features were highly variable. These data indicate that the variant is very likely to be associated with disease. Publications also reported experimental evidence evaluating an impact on protein function and demonstrated abnormal intranuclear localization of the variant protein, which was associated with defective nuclear stability (Ostlund_2001, Zwerger_2013). Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 , and both of them classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Charcot-Marie-Tooth disease type 2 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 03, 2023

This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 358 of the LMNA protein (p.Glu358Lys). This missense change has been observed in individual(s) with autosomal dominant LMNA-related conditions (PMID: 10939567, 20980393, 21520333, 21632249, 23183350, 24508248). In at least one individual the variant was observed to be de novo. For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change affects LMNA function (PMID: 11792809, 23427149). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt LMNA protein function. ClinVar contains an entry for this variant (Variation ID: 14525). -

Congenital muscular dystrophy due to LMNA mutation Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Aug 01, 2008

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
CardioboostCm	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.98	.;.;.;D;.;.;.;.
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.98
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.93	D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.78	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.1	H;.;H;H;H;.;.;.
PrimateAI	Pathogenic	0.90	D
PROVEAN	Uncertain	-3.8	D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.95
Sift	Uncertain	0.0020	D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.0030	D;D;D;D;D;D;D;D
Polyphen		1.0	D;.;D;D;.;.;D;.
Vest4		0.95
MutPred		0.83		Gain of MoRF binding (P = 0.0068);Gain of MoRF binding (P = 0.0068);Gain of MoRF binding (P = 0.0068);Gain of MoRF binding (P = 0.0068);Gain of MoRF binding (P = 0.0068);.;.;.;
MVP		0.98
MPC		2.2
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.82
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs60458016; hg19: chr1-156105827;