1-156138701-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_170707.4(LMNA):c.1912G>T(p.Gly638Trp) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,292 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G638R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: LMNA NM_170707.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.91

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 2 ACMG points.

• 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=0.36910307).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LMNA	NM_170707.4	c.1912G>T	p.Gly638Trp	missense_variant	11/12	ENST00000368300.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LMNA	ENST00000368300.9	c.1912G>T	p.Gly638Trp	missense_variant	11/12	1	NM_170707.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000402 AC: 1 AN: 248930 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135118

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.00000893

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461292 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726980

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.54
CardioboostCm	Benign	0.0039
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.090
Cadd	Pathogenic	29
Dann	Uncertain	1.0
Eigen	Uncertain	0.48
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Uncertain	0.88	D;D;D;D;D
M_CAP	Pathogenic	0.36	D
MetaRNN	Benign	0.37	T;T;T;T;T
MetaSVM	Uncertain	0.72	D
MutationTaster	Benign	0.99	D;D;D;D;D
PrimateAI	Uncertain	0.59	T
PROVEAN	Benign	-0.89	N;N;N;N;N
REVEL	Uncertain	0.45
Sift	Uncertain	0.0060	D;D;D;D;D
Sift4G	Uncertain	0.0070	D;D;D;D;D
Polyphen		1.0	D;D;.;.;.
Vest4		0.71
MutPred		0.32		.;Gain of MoRF binding (P = 0.0305);.;.;.;
MVP		0.85
MPC		1.2
ClinPred		0.75	D
GERP RS		4.7
Varity_R		0.22
gMVP		0.79

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: rs144851946; hg19: chr1-156108492;