rs201227908

chr1-156134868-C-Achr1-156134868-C-Gchr1-156134868-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM1 PM2 PP2 BP4

The NM_170707.4(LMNA):c.703C>A(p.Arg235Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,876 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. R235C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: LMNA NM_170707.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.94

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_170707.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, LMNA
• BP4: Computational evidence support a benign effect (MetaRNN=0.40721336).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LMNA	NM_170707.4	c.703C>A	p.Arg235Ser	missense_variant	4/12	ENST00000368300.9
LMNA	NM_005572.4	c.703C>A	p.Arg235Ser	missense_variant	4/10	ENST00000677389.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LMNA	ENST00000368300.9	c.703C>A	p.Arg235Ser	missense_variant	4/12	1	NM_170707.4	P1
LMNA	ENST00000677389.1	c.703C>A	p.Arg235Ser	missense_variant	4/10		NM_005572.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461876 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727232

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital muscular dystrophy due to LMNA mutation Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genomic Research Center, Shahid Beheshti University of Medical Sciences

Aug 07, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
CardioboostCm	Benign	0.0063
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
Cadd	Uncertain	24
Dann	Uncertain	0.99
Eigen	Benign	0.044
Eigen_PC	Benign	0.20
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.82	T;T;T;T;T;T;T;T;T
M_CAP	Benign	0.081	D
MetaRNN	Benign	0.41	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.43	T
MutationAssessor	Benign	1.5	L;.;L;L;L;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-1.6	N;N;N;N;N;N;N;N;N
REVEL	Uncertain	0.52
Sift	Benign	0.40	T;T;T;T;T;T;T;T;T
Sift4G	Benign	0.63	T;T;T;T;T;T;T;T;T
Polyphen		0.22	B;.;B;B;.;.;B;.;.
Vest4		0.58
MutPred		0.47		Gain of phosphorylation at R235 (P = 0.0292);Gain of phosphorylation at R235 (P = 0.0292);Gain of phosphorylation at R235 (P = 0.0292);Gain of phosphorylation at R235 (P = 0.0292);Gain of phosphorylation at R235 (P = 0.0292);.;.;.;.;
MVP		0.94
MPC		1.5
ClinPred		0.87	D
GERP RS		5.5
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		3.0
Varity_R		0.56
gMVP		0.83

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs201227908; hg19: chr1-156104659;