rs60446065

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1PM2PM5PP2PP3_StrongPP5

The ENST00000368300.9(LMNA):​c.127G>A​(p.Ala43Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000692 in 1,444,852 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A43E) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 32)
Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

LMNA
ENST00000368300.9 missense

Scores

16
3
1

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:1O:1

Conservation

PhyloP100: 9.95
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]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PM1
In a hotspot region, there are 12 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 13 uncertain in ENST00000368300.9
PM2
Very rare variant in population databases, with high coverage;
PM5
Other missense variant is known to change same aminoacid residue: Variant chr1-156115046-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 1457766.Status of the report is criteria_provided_single_submitter, 1 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, 0.989
PP5
Variant 1-156115045-G-A is Pathogenic according to our data. Variant chr1-156115045-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 66799.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Pathogenic=1, Uncertain_significance=1, not_provided=1}. Variant chr1-156115045-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
LMNANM_170707.4 linkuse as main transcriptc.127G>A p.Ala43Thr missense_variant 1/12 ENST00000368300.9 NP_733821.1
LMNANM_005572.4 linkuse as main transcriptc.127G>A p.Ala43Thr missense_variant 1/10 ENST00000677389.1 NP_005563.1

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
LMNAENST00000368300.9 linkuse as main transcriptc.127G>A p.Ala43Thr missense_variant 1/121 NM_170707.4 ENSP00000357283 P1P02545-1
LMNAENST00000677389.1 linkuse as main transcriptc.127G>A p.Ala43Thr missense_variant 1/10 NM_005572.4 ENSP00000503633 P02545-2

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD4 exome
AF:
6.92e-7
AC:
1
AN:
1444852
Hom.:
0
Cov.:
31
AF XY:
0.00000139
AC XY:
1
AN XY:
717142
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
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:
9.06e-7
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
Cov.:
32

ClinVar

Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:2Uncertain:1Other:1
Revision: criteria provided, conflicting classifications
LINK: link

Submissions by phenotype

not provided Pathogenic:1Uncertain:1Other:1
not provided, no classification providedliterature onlyEpithelial Biology; Institute of Medical Biology, Singapore-- -
Likely pathogenic, criteria provided, single submitterclinical testingGeneDxJan 10, 2017The A43T variant has been reported previously in an individual with Emery-Dreifuss muscular dystrophy (EDMD) type 2 who was heterozygous for this change and did not have another identifiable LMNA variant; however, information about parental testing was not provided and functional characterization of the variant was not performed (Brown et al., 2001). It was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The A43T variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. Additionally, this substitution occurs at a position that is conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. Furthermore, multiple missense variants in nearby residues have been reported in the Human Gene Mutation Database in association with LMNA-related disorders (Stenson et al., 2014), supporting the functional importance of this region of the protein. Therefore, this variant is likely pathogenic; however, the possibility that it is benign cannot be excluded. -
Uncertain significance, criteria provided, single submitterclinical testingEurofins Ntd Llc (ga)Apr 03, 2018- -
Charcot-Marie-Tooth disease type 2 Pathogenic:1
Pathogenic, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpOct 13, 2023This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 43 of the LMNA protein (p.Ala43Thr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of muscular dystrophy (PMID: 11503164; Invitae). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 66799). 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. Experimental studies have shown that this missense change affects LMNA function (PMID: 34862408). This variant disrupts the p.Ala43 amino acid residue in LMNA. Other variant(s) that disrupt this residue have been observed in individuals with LMNA-related conditions (PMID: 28688748), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
0.99
CardioboostCm
Pathogenic
1.0
BayesDel_addAF
Pathogenic
0.57
D
BayesDel_noAF
Pathogenic
0.57
CADD
Pathogenic
32
DANN
Pathogenic
1.0
DEOGEN2
Pathogenic
0.98
.;.;.;D;.
Eigen
Pathogenic
0.98
Eigen_PC
Pathogenic
0.89
FATHMM_MKL
Pathogenic
0.98
D
LIST_S2
Pathogenic
0.99
D;D;D;D;D
M_CAP
Pathogenic
0.71
D
MetaRNN
Pathogenic
0.99
D;D;D;D;D
MetaSVM
Pathogenic
1.1
D
MutationAssessor
Pathogenic
4.8
H;.;H;H;H
MutationTaster
Benign
1.0
D;D;D;D;D
PrimateAI
Uncertain
0.76
T
PROVEAN
Uncertain
-3.5
D;D;D;D;D
REVEL
Pathogenic
0.97
Sift
Pathogenic
0.0
D;D;D;D;D
Sift4G
Uncertain
0.021
D;D;D;D;D
Polyphen
1.0
D;.;D;D;.
Vest4
0.96
MutPred
0.92
Gain of phosphorylation at A43 (P = 0.0767);Gain of phosphorylation at A43 (P = 0.0767);Gain of phosphorylation at A43 (P = 0.0767);Gain of phosphorylation at A43 (P = 0.0767);Gain of phosphorylation at A43 (P = 0.0767);
MVP
0.99
MPC
2.1
ClinPred
1.0
D
GERP RS
4.8
RBP_binding_hub_radar
0.0
RBP_regulation_power_radar
1.7
Varity_R
0.86
gMVP
0.99

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.

Other links and lift over

dbSNP: rs60446065; hg19: chr1-156084836; API