rs777648901

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2PM5PP2

The NM_170707.4(LMNA):c.1256G>A(p.Arg419His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000199 in 1,612,068 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R419C) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000021 ( 0 hom. )

Consequence

LMNA
NM_170707.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 8.02

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-156136311-C-T is described in Lovd as [Likely_pathogenic].

PP2

Missense variant where missense usually causes diseases, LMNA

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LMNA	NM_170707.4 linkuse as main transcript	c.1256G>A	p.Arg419His	missense_variant	7/12	ENST00000368300.9
LMNA	NM_005572.4 linkuse as main transcript	c.1256G>A	p.Arg419His	missense_variant	7/10	ENST00000677389.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LMNA	ENST00000368300.9 linkuse as main transcript	c.1256G>A	p.Arg419His	missense_variant	7/12	1	NM_170707.4	P1	P02545-1
LMNA	ENST00000677389.1 linkuse as main transcript	c.1256G>A	p.Arg419His	missense_variant	7/10		NM_005572.4		P02545-2

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000519

AC:

AN:

250594

Hom.:

AF XY:

0.0000443

AC XY:

AN XY:

135548

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000145

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000440

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000206

AC:

AN:

1459850

Hom.:

Cov.:

AF XY:

0.0000220

AC XY:

AN XY:

726260

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000112

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000928

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000117

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152218

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74358

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.0000659

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Charcot-Marie-Tooth disease

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Molecular Genetics Laboratory, London Health Sciences Centre

- -

Charcot-Marie-Tooth disease type 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Sep 22, 2023

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 419 of the LMNA protein (p.Arg419His). This variant is present in population databases (rs777648901, gnomAD 0.01%). This missense change has been observed in individual(s) with clinical features of LMNA-related conditions (PMID: 27650965, 31383942). ClinVar contains an entry for this variant (Variation ID: 476822). 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. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Primary dilated cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Jan 11, 2024

This missense variant replaces arginine with histidine at codon 419 of the LMNA protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in a case of sudden unexplained death (PMID: 27650965). This variant has been reported in an individual with affected with cardiomyopathy and in individuals affected with conduction defects (PMID: 31383942). This variant has also been reported in multiple individuals with no cardiac phenotype (PMID: 28663758, 31383942). This variant has been identified in 14/281984 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Hutchinson-Gilford syndrome;C0410190:Emery-Dreifuss muscular dystrophy 2, autosomal dominant;C0796031:Dilated cardiomyopathy-hypergonadotropic hypogonadism syndrome;C1449563:Dilated cardiomyopathy 1A;C1720860:Familial partial lipodystrophy, Dunnigan type;C1854154:Charcot-Marie-Tooth disease type 2B1;C1857829:Heart-hand syndrome, Slovenian type;C2750035:Emery-Dreifuss muscular dystrophy 3, autosomal recessive;C2750785:Congenital muscular dystrophy due to LMNA mutation;C5399785:Mandibuloacral dysplasia with type A lipodystrophy;C5676942:Restrictive dermopathy 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Jan 03, 2022

- -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 03, 2023

The p.R419H variant (also known as c.1256G>A), located in coding exon 7 of the LMNA gene, results from a G to A substitution at nucleotide position 1256. The arginine at codon 419 is replaced by histidine, an amino acid with highly similar properties. This alteration has been detected in a sudden unexplained death case, a case with suspected Charcot-Marie-Tooth disease, and in individuals reported to have cardiomyopathy and/or cardiac conduction disease; however, clinical details were limited (Christiansen SL et al. Eur. J. Hum. Genet., 2016 12;24:1797-1802; Park J et al. Genet Med. 2020 Jan;22(1):102-111; Volodarsky M et al. J Med Genet. 2021 Apr;58(4):284-288). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.59

CardioboostCm

Pathogenic

0.94

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Pathogenic

0.37

Cadd

Pathogenic

Dann

Pathogenic

1.0

Eigen

Uncertain

0.67

Eigen_PC

Pathogenic

0.71

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.96

D;D;D;D;D;D;D;D;D

M_CAP

Pathogenic

0.61

MetaRNN

Uncertain

0.74

D;D;D;D;D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.4

M;.;M;M;M;.;.;.;.

MutationTaster

Benign

1.0

D;D;D;D;D;D;D;D;D

PrimateAI

Uncertain

0.61

PROVEAN

Uncertain

-3.1

D;D;D;D;D;D;D;D;N

REVEL

Pathogenic

0.72

Sift

Uncertain

0.0030

D;D;D;D;D;D;D;D;D

Sift4G

Uncertain

0.015

D;D;D;D;D;D;T;D;D

Polyphen

1.0

D;.;D;D;.;.;D;.;.

Vest4

0.48

MutPred

0.44

Gain of ubiquitination at K418 (P = 0.0354);Gain of ubiquitination at K418 (P = 0.0354);Gain of ubiquitination at K418 (P = 0.0354);Gain of ubiquitination at K418 (P = 0.0354);Gain of ubiquitination at K418 (P = 0.0354);.;.;.;.;

MVP

0.96

MPC

1.2

ClinPred

0.63

GERP RS

5.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.9

Varity_R

0.36

gMVP

0.84

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over