1-225404451-T-C

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PM5PP3_StrongPP5_Very_Strong

The NM_002296.4(LBR):c.1640A>G(p.Asn547Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000378 in 1,614,032 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N547D) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000038 ( 0 hom. )

Consequence

LBR
NM_002296.4 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:5U:1

Conservation

PhyloP100: 7.94

Publications

5 publications found

Variant links:

Genes affected

LBR (HGNC:6518): (lamin B receptor) The protein encoded by this gene belongs to the ERG4/ERG24 family. It localized in the nuclear envelope inner membrane and anchors the lamina and the heterochromatin to the membrane. It may mediate interaction between chromatin and lamin B. Mutations of this gene has been associated with autosomal recessive HEM/Greenberg skeletal dysplasia. Alternative splicing occurs at this locus and two transcript variants encoding the same protein have been identified. [provided by RefSeq, Jul 2008]

LBR Gene-Disease associations (from GenCC):

Greenberg dysplasia
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), ClinGen, G2P
Pelger-Huet anomaly
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
regressive spondylometaphyseal dysplasia
Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet

LBR links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 14 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-225404452-T-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 100900.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.986

PP5

Variant 1-225404451-T-C is Pathogenic according to our data. Variant chr1-225404451-T-C is described in ClinVar as Pathogenic. ClinVar VariationId is 224875.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LBR	NM_002296.4 link	c.1640A>G	p.Asn547Ser	missense_variant	Exon 13 of 14	ENST00000272163.9	NP_002287.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LBR	ENST00000272163.9 link	c.1640A>G	p.Asn547Ser	missense_variant	Exon 13 of 14	1	NM_002296.4	ENSP00000272163.4

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000318

AC:

AN:

251478

AF XY:

0.0000294

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000352

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000376

AC:

AN:

1461832

Hom.:

Cov.:

AF XY:

0.0000385

AC XY:

AN XY:

727214

show subpopulations

African (AFR)

AF:

0.0000597

AC:

AN:

33480

American (AMR)

AF:

0.0000224

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.000522

AC:

AN:

5752

European-Non Finnish (NFE)

AF:

0.0000387

AC:

AN:

1111976

Other (OTH)

AF:

0.0000497

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

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:

0.0000394

AC:

AN:

152200

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74350

show subpopulations

African (AFR)

AF:

0.0000724

AC:

AN:

41452

American (AMR)

AF:

0.00

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68034

Other (OTH)

AF:

0.00

AC:

AN:

2088

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:

0.0000823

Hom.:

Bravo

AF:

0.0000567

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

LBR-related disorder

Pathogenic:1

Nov 04, 2023

PreventionGenetics, part of Exact Sciences

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The LBR c.1640A>G variant is predicted to result in the amino acid substitution p.Asn547Ser. This variant has been reported in the compound heterozygous state with a nonsense variant (p.Arg76*) in an individual with rhizomelic skeletal dysplasia with Pelger-Huet anomaly (Sobreira et al. 2015. PubMed ID: 25348816). An alternate nucleotide change affecting the same amino acid (p.Asn547Asp) was reported in the homozygous state in a fetus with features consistent with Greenberg skeletal dysplasia (Konstantinidou et al. 2008. PubMed ID: 18382993). The p.Asn547 amino acid is located within a transmembrane region in the sterol reductase domain of the Lamin B Receptor, and maps to the NADPH binding pocket (Turner. 2016. PubMed ID: 27830109). The p.Asn547Asp substitution was reported to reduce NADPH binding capacity by nearly 12-fold and lead to a near complete loss of de novo cholesterol synthesis, emphasizing the importance of the p.Asn547 amino acid (Turner. 2016. PubMed ID: 27830109). This variant is reported in 0.0080% of alleles in individuals of African descent in gnomAD (http://gnomad.broadinstitute.org/variant/1-225592153-T-C). Taken together, the p.Asn547Ser variant is interpreted as likely pathogenic. -

Anadysplasia-like, spontaneously remitting spondylometaphyseal dysplasia

Pathogenic:1

Baylor-Hopkins Center for Mendelian Genomics, Johns Hopkins University School of Medicine

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

- -

not provided

Pathogenic:1

Apr 10, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 547 of the LBR protein (p.Asn547Ser). This variant is present in population databases (rs374343844, gnomAD 0.008%). This missense change has been observed in individual(s) with clinical features of LBR-related skeletal condition (PMID: 25348816; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 224875). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt LBR protein function with a positive predictive value of 80%. This variant disrupts the p.Asn547 amino acid residue in LBR. Other variant(s) that disrupt this residue have been observed in individuals with LBR-related conditions (PMID: 18382993), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. -

RHIZOMELIC SKELETAL DYSPLASIA WITH PELGER-HUET ANOMALY

Pathogenic:1

Mar 17, 2022

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Greenberg dysplasia

Pathogenic:1

Baylor-Hopkins Center for Mendelian Genomics, Johns Hopkins University School of Medicine

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

- -

Reynolds syndrome

Uncertain:1

Jul 09, 2019

Baylor Genetics

Significance:Uncertain significance

Review Status:flagged submission

Collection Method:clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.34

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Pathogenic

0.16

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.97

D;D

Eigen

Pathogenic

0.92

Eigen_PC

Pathogenic

0.87

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.91

.;D

M_CAP

Pathogenic

0.66

MetaRNN

Pathogenic

0.99

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

4.2

H;H

PhyloP100

7.9

PrimateAI

Uncertain

0.60

PROVEAN

Pathogenic

-4.7

D;D

REVEL

Pathogenic

0.98

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;D

Vest4

0.96

MVP

0.96

MPC

0.46

ClinPred

1.0

GERP RS

5.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.90

gMVP

0.89

Mutation Taster

=9/91

disease causing (ClinVar)

(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