rs751916168

Positions:

chr1-156114938-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 5P and 2B. PM1PM2PP2BP4_Moderate

The ENST00000368300.9(LMNA):c.20G>A(p.Arg7Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000703 in 1,564,146 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. R7W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000071 ( 0 hom. )

Consequence

LMNA
ENST00000368300.9 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 2.85

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 3 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in ENST00000368300.9

PM2

Very rare variant in population databases, with high coverage;

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.

BP4

Computational evidence support a benign effect (MetaRNN=0.1374745).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LMNA	NM_170707.4 linkuse as main transcript	c.20G>A	p.Arg7Gln	missense_variant	1/12	ENST00000368300.9	NP_733821.1
LMNA	NM_005572.4 linkuse as main transcript	c.20G>A	p.Arg7Gln	missense_variant	1/10	ENST00000677389.1	NP_005563.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LMNA	ENST00000368300.9 linkuse as main transcript	c.20G>A	p.Arg7Gln	missense_variant	1/12	1	NM_170707.4	ENSP00000357283	P1	P02545-1
LMNA	ENST00000677389.1 linkuse as main transcript	c.20G>A	p.Arg7Gln	missense_variant	1/10		NM_005572.4	ENSP00000503633		P02545-2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000571

AC:

AN:

175212

Hom.:

AF XY:

0.0000106

AC XY:

AN XY:

94704

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000355

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000708

AC:

AN:

1411954

Hom.:

Cov.:

AF XY:

0.00000860

AC XY:

AN XY:

697450

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000256

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000828

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152192

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74344

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.0000258

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Phosphorus, Inc.

Jan 17, 2022

This missense variant results in a substitution of arginine with glutamine at codon 7 of the LMNA gene (transcript NM_170707.3). This variant has been reported in ClinVar (408991) NM_170707.4 (LMNA):c.20G>A (p.Arg7Gln) and occurred once in GnomAD with a total MAF of 0.0006% and highest MAF of 0.0037% in the Latin American population. This position is conserved. In silico functional algorithms agree, predicting it as benign (PolyPhen/REVEL) and tolerated (SIFT), but no functional studies were performed to confirm these predictions. The variant has not occurred in the literature associated with the disease. Two different missense changes nearby have been determined to be pathogenic (c.11C>G (p.Pro4Arg), c.29C>T (p.Thr10Ile)). In conclusion, the available evidence is insufficient to determine the pathogenicity of this variant. Therefore, it is classified as a Variant of Uncertain Significance. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Sep 23, 2019

This missense variant replaces arginine with glutamine at codon 7 of the LMNA protein. Computational prediction tool suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold ≤0.5, PMID: 27666373). Splice site prediction tools suggest that this variant may not impact RNA splicing. To our knowledge, functional studies have not been performed for this variant. This variant has not been reported in individuals affected with cardiovascular disorders in the literature. This variant has been identified in 1/175212 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. -

Charcot-Marie-Tooth disease type 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 20, 2023

ClinVar contains an entry for this variant (Variation ID: 408991). This variant has not been reported in the literature in individuals affected with LMNA-related conditions. This variant is present in population databases (rs751916168, gnomAD 0.004%). This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 7 of the LMNA protein (p.Arg7Gln). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.27

CardioboostCm

Uncertain

0.19

BayesDel_addAF

Benign

-0.058

BayesDel_noAF

Benign

-0.21

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.39

.;.;.;T;.

Eigen

Benign

-0.029

Eigen_PC

Benign

0.13

FATHMM_MKL

Benign

0.27

LIST_S2

Uncertain

0.88

D;D;D;D;D

M_CAP

Pathogenic

0.37

MetaRNN

Benign

0.14

T;T;T;T;T

MetaSVM

Benign

-0.75

MutationAssessor

Benign

0.17

N;.;N;N;N

MutationTaster

Benign

0.53

D;D;D;D;D

PrimateAI

Uncertain

0.73

PROVEAN

Benign

-0.32

N;N;N;N;N

REVEL

Benign

0.21

Sift

Benign

0.39

T;T;T;T;T

Sift4G

Benign

0.61

T;T;T;T;T

Polyphen

0.88

P;.;B;P;.

Vest4

0.38

MutPred

0.24

Loss of MoRF binding (P = 0.0123);Loss of MoRF binding (P = 0.0123);Loss of MoRF binding (P = 0.0123);Loss of MoRF binding (P = 0.0123);Loss of MoRF binding (P = 0.0123);

MVP

0.81

MPC

1.1

ClinPred

0.23

GERP RS

4.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.9

Varity_R

0.12

gMVP

0.92

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