Genetic Variant LMNA:p.Ile299Val (chr1-156135271-A-G) – ACMG Classification: Benign (-7 pts)

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 2P and 9B. PM1BP4_StrongBP6BS1

The NM_170707.4(LMNA):c.895A>G(p.Ile299Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000178 in 1,613,644 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/23 in silico tools predict a benign 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. I299T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00018 ( 0 hom. )

Consequence

LMNA
NM_170707.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:9

Conservation

PhyloP100: 2.98

Publications

9 publications found

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]

LMNA Gene-Disease associations (from GenCC):

dilated cardiomyopathy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
dilated cardiomyopathy 1A
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, G2P
familial partial lipodystrophy, Dunnigan type
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
restrictive dermopathy 2
Inheritance: AR, AD Classification: DEFINITIVE, LIMITED Submitted by: G2P
Emery-Dreifuss muscular dystrophy 2, autosomal dominant
Inheritance: SD, AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
Hutchinson-Gilford progeria syndrome
Inheritance: SD, AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, G2P, Labcorp Genetics (formerly Invitae)
lipodystrophy
Inheritance: SD Classification: DEFINITIVE Submitted by: ClinGen
atrioventricular block
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
Charcot-Marie-Tooth disease type 2B1
Inheritance: AD, AR Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, G2P, Ambry Genetics
heart-hand syndrome, Slovenian type
Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: G2P, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
Emery-Dreifuss muscular dystrophy 3, autosomal recessive
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
mandibuloacral dysplasia with type A lipodystrophy
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
atrial fibrillation
Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
atypical Werner syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
autosomal dominant Emery-Dreifuss muscular dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
congenital muscular dystrophy due to LMNA mutation
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial isolated dilated cardiomyopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
lethal restrictive dermopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
LMNA-related cardiocutaneous progeria syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
autosomal recessive Emery-Dreifuss muscular dystrophy
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
dilated cardiomyopathy-hypergonadotropic hypogonadism syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
autosomal semi-dominant severe lipodystrophic laminopathy
Inheritance: SD Classification: SUPPORTIVE Submitted by: Orphanet
arrhythmogenic right ventricular cardiomyopathy
Inheritance: AD Classification: LIMITED Submitted by: ClinGen

LMNA links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

PM1

In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 26 uncertain in NM_170707.4

BP4

Computational evidence support a benign effect (MetaRNN=0.019576252).

BP6

Variant 1-156135271-A-G is Benign according to our data. Variant chr1-156135271-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 48092.

BS1

Variant frequency is greater than expected in population amr. GnomAdExome4 allele frequency = 0.000181 (264/1461264) while in subpopulation AMR AF = 0.00262 (117/44718). AF 95% confidence interval is 0.00223. There are 0 homozygotes in GnomAdExome4. There are 116 alleles in the male GnomAdExome4 subpopulation. Median coverage is 34. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_170707.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
LMNA	NM_170707.4	MANE Select	c.895A>G	p.Ile299Val	missense	Exon 5 of 12	NP_733821.1	P02545-1
LMNA	NM_005572.4	MANE Plus Clinical	c.895A>G	p.Ile299Val	missense	Exon 5 of 10	NP_005563.1	P02545-2
LMNA	NM_001406985.1		c.895A>G	p.Ile299Val	missense	Exon 5 of 13	NP_001393914.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
LMNA	ENST00000368300.9	TSL:1 MANE Select	c.895A>G	p.Ile299Val	missense	Exon 5 of 12	ENSP00000357283.4	P02545-1
LMNA	ENST00000677389.1	MANE Plus Clinical	c.895A>G	p.Ile299Val	missense	Exon 5 of 10	ENSP00000503633.1	P02545-2
LMNA	ENST00000368299.7	TSL:1	c.895A>G	p.Ile299Val	missense	Exon 5 of 12	ENSP00000357282.3	P02545-6

Frequencies

GnomAD3 genomes

AF:

0.000158

AC:

AN:

152262

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000785

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000479

AC:

120

AN:

250316

AF XY:

0.000383

show subpopulations

Gnomad AFR exome

AF:

0.0000623

Gnomad AMR exome

AF:

0.00307

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000708

Gnomad OTH exome

AF:

0.000656

GnomAD4 exome

AF:

0.000181

AC:

264

AN:

1461264

Hom.:

Cov.:

AF XY:

0.000160

AC XY:

116

AN XY:

726940

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33478

American (AMR)

AF:

0.00262

AC:

117

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52850

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000117

AC:

130

AN:

1111984

Other (OTH)

AF:

0.000215

AC:

AN:

60382

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.460

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000158

AC:

AN:

152380

Hom.:

Cov.:

AF XY:

0.000174

AC XY:

AN XY:

74514

show subpopulations

African (AFR)

AF:

0.0000481

AC:

AN:

41592

American (AMR)

AF:

0.000784

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000147

AC:

AN:

68042

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000231

Hom.:

Bravo

AF:

0.000314

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000395

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000119

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (4)

not specified (2)

Cardiomyopathy (1)

Cardiovascular phenotype (1)

Charcot-Marie-Tooth disease (1)

Charcot-Marie-Tooth disease type 2 (1)

Familial partial lipodystrophy, Dunnigan type (1)

LMNA-related disorder (1)

Primary dilated cardiomyopathy (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

CardioboostCm

Benign

0.030

BayesDel_addAF

Benign

-0.059

BayesDel_noAF

Pathogenic

0.14

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Uncertain

0.59

Eigen

Benign

-0.19

Eigen_PC

Benign

0.019

FATHMM_MKL

Uncertain

0.90

LIST_S2

Benign

0.83

M_CAP

Uncertain

0.095

MetaRNN

Benign

0.020

MetaSVM

Benign

-0.44

MutationAssessor

Benign

0.93

PhyloP100

3.0

PrimateAI

Uncertain

0.62

PROVEAN

Benign

-0.33

REVEL

Uncertain

0.45

Sift

Benign

0.49

Sift4G

Benign

0.48

Polyphen

0.0090

Vest4

0.60

MVP

0.97

MPC

0.81

ClinPred

0.038

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.060

gMVP

0.84

Mutation Taster

=0/100

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over