1-156136258-G-A
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Variant summary
Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2PM5PP2
The ENST00000368300.9(LMNA):c.1202G>A(p.Arg401His) variant causes a missense change. The variant allele was found at a frequency of 0.0000639 in 1,611,884 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. R401C) has been classified as Uncertain significance.
Frequency
Genomes: 𝑓 0.000085 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000062 ( 0 hom. )
Consequence
LMNA
ENST00000368300.9 missense
ENST00000368300.9 missense
Scores
2
14
4
Clinical Significance
Conservation
PhyloP100: 4.49
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]
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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 chr1-156136257-C-T is described in Lovd as [Pathogenic].
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.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|
| LMNA | NM_170707.4 | c.1202G>A | p.Arg401His | missense_variant | 7/12 | ENST00000368300.9 | NP_733821.1 | |
| LMNA | NM_005572.4 | c.1202G>A | p.Arg401His | missense_variant | 7/10 | ENST00000677389.1 | NP_005563.1 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|---|
| LMNA | ENST00000368300.9 | c.1202G>A | p.Arg401His | missense_variant | 7/12 | 1 | NM_170707.4 | ENSP00000357283.4 | ||
| LMNA | ENST00000677389.1 | c.1202G>A | p.Arg401His | missense_variant | 7/10 | NM_005572.4 | ENSP00000503633.1 |
Frequencies
GnomAD3 genomes 0.0000854 AC: 13AN: 152242Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.0000803 AC: 20AN: 249196Hom.: 0 AF XY: 0.0000964 AC XY: 13AN XY: 134840
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GnomAD4 exome AF: 0.0000617 AC: 90AN: 1459642Hom.: 0 Cov.: 34 AF XY: 0.0000647 AC XY: 47AN XY: 726152
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GnomAD4 genome 0.0000854 AC: 13AN: 152242Hom.: 0 Cov.: 32 AF XY: 0.0000807 AC XY: 6AN XY: 74380
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:11
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not provided Uncertain:6
| Uncertain significance, criteria provided, single submitter | clinical testing | Athena Diagnostics | Jun 08, 2022 | - - |
| Uncertain significance, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Apr 02, 2018 | - - |
| Uncertain significance, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Dec 09, 2019 | - - |
| Uncertain significance, no assertion criteria provided | clinical testing | Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+ | - | - - |
| Uncertain significance, no assertion criteria provided | clinical testing | Genome Diagnostics Laboratory, University Medical Center Utrecht | - | - - |
| Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Dec 28, 2023 | Reported in association with cardiomyopathy (PMID: 32009526, 31744510); At the protein level, in silico analysis supports that this missense variant has a deleterious effect on protein structure/function; At the mRNA level, in silico analysis suggests this variant may impact gene splicing. In the absence of RNA/functional studies, the actual effect of this sequence change is unknown.; This variant is associated with the following publications: (PMID: 31744510, 28663758, 10939567, 36788754, 30564623, 26582918, 32009526) - |
Cardiomyopathy Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Dec 29, 2023 | This missense variant replaces arginine with histidine at codon 401 of the lamin A/C protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual affected with dilated cardiomyopathy (PMID: 31744510) and in another individual diagnosed with unspecified cardiomyopathy (PMID: 32009526). This variant has been identified in 24/280578 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 | Jan 08, 2024 | This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 401 of the LMNA protein (p.Arg401His). This variant is present in population databases (rs141490569, gnomAD 0.03%). This missense change has been observed in individual(s) with cardiomyopathy (PMID: 31744510, 32009526). ClinVar contains an entry for this variant (Variation ID: 287940). 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 with a positive predictive value of 95%. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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 | Feb 05, 2024 | This missense variant replaces arginine with histidine at codon 401 of the lamin A/C protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual affected with dilated cardiomyopathy (PMID: 31744510) and in another individual diagnosed with unspecified cardiomyopathy (PMID: 32009526). This variant has been identified in 24/280578 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 | May 18, 2022 | - - |
Cardiovascular phenotype Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Oct 03, 2022 | The p.R401H variant (also known as c.1202G>A), located in coding exon 7 of the LMNA gene, results from a G to A substitution at nucleotide position 1202. The arginine at codon 401 is replaced by histidine, an amino acid with highly similar properties. This alteration has been reported in a laminopathy cohort and a dilated cardiomyopathy cohort; however, clinical details were limited (Ditaranto R et al. Orphanet J Rare Dis, 2019 11;14:263; Pottinger TD et al. J Am Heart Assoc, 2020 02;9:e013808). Additionally, this alteration was detected in an exome cohort, but clinical details were not provided (Florwick A et al. Front Genet. 2017;8:79). This amino acid position is well 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:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
CardioboostCm
Benign
BayesDel_addAF
Uncertain
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
DEOGEN2
Uncertain
.;.;.;D;.;.;.;.;T
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;D;D;D;D;D;D;D;D
M_CAP
Uncertain
D
MetaRNN
Uncertain
T;T;T;T;T;T;T;T;T
MetaSVM
Uncertain
D
MutationAssessor
Uncertain
M;.;M;M;M;.;.;.;.
MutationTaster
Benign
D;D;D;D;D;D;D;D;D
PrimateAI
Uncertain
T
PROVEAN
Benign
N;N;N;N;N;D;D;D;N
REVEL
Uncertain
Sift
Uncertain
D;D;D;D;D;D;D;D;D
Sift4G
Uncertain
D;D;D;T;D;T;T;T;D
Polyphen
D;.;P;B;.;.;B;.;.
Vest4
MVP
MPC
0.46
ClinPred
T
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
Splicing
Name
Calibrated prediction
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SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_AG_spliceai
Position offset: 23
Find out detailed SpliceAI scores and Pangolin per-transcript scores at