rs797044486

chr1-156138560-T-A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PM5 PP2

The NM_170707.4(LMNA):c.1771T>A(p.Cys591Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as not provided (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C591F) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LMNA NM_170707.4 missense
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: 7.39

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 Likely_pathogenic. Variant got 7 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 14 uncertain in NM_170707.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-156138561-G-T is described in Lovd as [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	c.1771T>A	p.Cys591Ser	missense_variant	11/12	ENST00000368300.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LMNA	ENST00000368300.9	c.1771T>A	p.Cys591Ser	missense_variant	11/12	1	NM_170707.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: not provided

Submissions summary: Other:1

Revision: no classification provided

Submissions by phenotype

Hutchinson-Gilford syndrome Other:1

not provided, no classification provided

literature only

GeneReviews

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
CardioboostCm	Uncertain	0.12
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.34
Cadd	Uncertain	25
Dann	Uncertain	0.99
Eigen	Benign	0.15
Eigen_PC	Uncertain	0.23
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.72	T;T;T;T;T;T
M_CAP	Pathogenic	0.68	D
MetaRNN	Uncertain	0.69	D;D;D;D;D;D
MetaSVM	Uncertain	0.50	D
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	-0.26	N;N;N;N;N;N
REVEL	Pathogenic	0.87
Sift	Uncertain	0.0050	D;D;D;D;D;D
Sift4G	Benign	0.39	T;D;D;D;D;D
Polyphen		0.72	P;P;.;.;.;.
Vest4		0.92
MutPred		0.41		.;Gain of glycosylation at C591 (P = 0.0047);Gain of glycosylation at C591 (P = 0.0047);.;.;.;
MVP		0.93
MPC		1.0
ClinPred		0.89	D
GERP RS		5.0
Varity_R		0.51
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs797044486; hg19: chr1-156108351;