NM_032737.4:c.428C>T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_StrongBP6_Moderate

The NM_032737.4(LMNB2):c.428C>T(p.Thr143Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000036 in 1,609,798 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. T143T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000085 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000031 ( 1 hom. )

Consequence

LMNB2
NM_032737.4 missense

Scores

Clinical Significance

Likely benign criteria provided, single submitter U:1B:1

Conservation

PhyloP100: 2.42

Publications

0 publications found

Variant links:

Genes affected

LMNB2 (HGNC:6638): (lamin B2) This gene encodes a B type nuclear lamin. The nuclear lamina consists of 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. Mutations in this gene are associated with acquired partial lipodystrophy. [provided by RefSeq, May 2012]

LMNB2 Gene-Disease associations (from GenCC):

microcephaly 27, primary, autosomal dominant
Inheritance: AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
progressive myoclonic epilepsy type 9
Inheritance: AR Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
microcephaly
Inheritance: AD Classification: MODERATE Submitted by: Franklin by Genoox
lipodystrophy, partial, acquired, susceptibility to
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
central nervous system malformation
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

LMNB2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.025100082).

BP6

Variant 19-2438505-G-A is Benign according to our data. Variant chr19-2438505-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 475782.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LMNB2	NM_032737.4 link	c.428C>T	p.Thr143Met	missense_variant	Exon 3 of 12	ENST00000325327.4	NP_116126.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LMNB2	ENST00000325327.4 link	c.428C>T	p.Thr143Met	missense_variant	Exon 3 of 12	1	NM_032737.4	ENSP00000327054.3

Frequencies

GnomAD3 genomes

AF:

0.0000854

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000770

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000138

AC:

AN:

246490

AF XY:

0.000127

show subpopulations

Gnomad AFR exome

AF:

0.000253

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00137

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000362

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000309

AC:

AN:

1457514

Hom.:

Cov.:

AF XY:

0.0000359

AC XY:

AN XY:

724698

show subpopulations

African (AFR)

AF:

0.000210

AC:

AN:

33392

American (AMR)

AF:

0.00

AC:

AN:

44638

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26082

East Asian (EAS)

AF:

0.000353

AC:

AN:

39636

South Asian (SAS)

AF:

0.000128

AC:

AN:

86084

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52188

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4842

European-Non Finnish (NFE)

AF:

0.00000810

AC:

AN:

1110478

Other (OTH)

AF:

0.0000665

AC:

AN:

60174

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

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:

0.0000854

AC:

AN:

152284

Hom.:

Cov.:

AF XY:

0.0000940

AC XY:

AN XY:

74444

show subpopulations

African (AFR)

AF:

0.000144

AC:

AN:

41574

American (AMR)

AF:

0.00

AC:

AN:

15296

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000772

AC:

AN:

5184

South Asian (SAS)

AF:

0.000207

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68014

Other (OTH)

AF:

0.00

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

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:

0.000143

Hom.:

Bravo

AF:

0.0000831

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000165

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

LMNB2-related disorder

Uncertain:1

Sep 26, 2024

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The LMNB2 c.428C>T variant is predicted to result in the amino acid substitution p.Thr143Met. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.15% of alleles in individuals of East Asian descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence.

Lipodystrophy, partial, acquired, susceptibility to;C4225289:Progressive myoclonic epilepsy type 9

Benign:1

Dec 12, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.077

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.37

CADD

Benign

(source)

DANN

Benign

0.94

DEOGEN2

Uncertain

0.70

Eigen

Benign

-0.46

Eigen_PC

Benign

-0.46

FATHMM_MKL

Benign

0.65

LIST_S2

Benign

0.74

M_CAP

Benign

0.078

MetaRNN

Benign

0.025

MetaSVM

Benign

-0.80

PhyloP100

2.4

PrimateAI

Benign

0.43

REVEL

Benign

0.047

Sift4G

Uncertain

0.036

Vest4

0.17

ClinPred

0.016

GERP RS

3.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.041

gMVP

0.059

Mutation Taster

=76/24

polymorphism

(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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over