NM_002292.4:c.4224+19G>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_002292.4(LAMB2):c.4224+19G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0116 in 1,609,368 control chromosomes in the GnomAD database, including 254 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0071 ( 14 hom., cov: 33)

Exomes 𝑓: 0.012 ( 240 hom. )

Consequence

LAMB2
NM_002292.4 intron

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: 0.531

Publications

5 publications found

Variant links:

Genes affected

LAMB2 (HGNC:6487): (laminin subunit beta 2) Laminins, a family of extracellular matrix glycoproteins, are the major noncollagenous constituent of basement membranes. They have been implicated in a wide variety of biological processes including cell adhesion, differentiation, migration, signaling, neurite outgrowth and metastasis. Laminins, composed of 3 non identical chains: laminin alpha, beta and gamma (formerly A, B1, and B2, respectively), form a cruciform structure consisting of 3 short arms, each formed by a different chain, and a long arm composed of all 3 chains. Each laminin chain is a multidomain protein encoded by a distinct gene. Several isoforms of each chain have been described. Different alpha, beta and gamma chain isomers combine to give rise to different heterotrimeric laminin isoforms which are designated by Arabic numerals in the order of their discovery, i.e. alpha1beta1gamma1 heterotrimer is laminin 1. The biological functions of the different chains and trimer molecules are largely unknown, but some of the chains have been shown to differ with respect to their tissue distribution, presumably reflecting diverse functions in vivo. This gene encodes the beta chain isoform laminin, beta 2. The beta 2 chain contains the 7 structural domains typical of beta chains of laminin, including the short alpha region. However, unlike beta 1 chain, beta 2 has a more restricted tissue distribution. It is enriched in the basement membrane of muscles at the neuromuscular junctions, kidney glomerulus and vascular smooth muscle. Transgenic mice in which the beta 2 chain gene was inactivated by homologous recombination, showed defects in the maturation of neuromuscular junctions and impairment of glomerular filtration. Alternative splicing involving a non consensus 5' splice site (gc) in the 5' UTR of this gene has been reported. It was suggested that inefficient splicing of this first intron, which does not change the protein sequence, results in a greater abundance of the unspliced form of the transcript than the spliced form. The full-length nature of the spliced transcript is not known. [provided by RefSeq, Aug 2011]

LAMB2 Gene-Disease associations (from GenCC):

Pierson syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, PanelApp Australia, Orphanet
LAMB2-related infantile-onset nephrotic syndrome
Inheritance: AR Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)

LAMB2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.85).

BP6

Variant 3-49123113-C-T is Benign according to our data. Variant chr3-49123113-C-T is described in ClinVar as Benign. ClinVar VariationId is 258611.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.00706 (1076/152330) while in subpopulation SAS AF = 0.0413 (199/4824). AF 95% confidence interval is 0.0366. There are 14 homozygotes in GnomAd4. There are 565 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 14 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LAMB2	NM_002292.4 link	c.4224+19G>A		intron_variant	Intron 26 of 31	ENST00000305544.9	NP_002283.3	P55268
LAMB2	XM_005265127.5 link	c.4224+19G>A		intron_variant	Intron 27 of 32		XP_005265184.1	P55268

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
LAMB2	ENST00000305544.9 link	c.4224+19G>A	intron_variant	Intron 26 of 31	1	NM_002292.4	ENSP00000307156.4	P55268
LAMB2	ENST00000418109.5 link	c.4224+19G>A	intron_variant	Intron 27 of 32	1		ENSP00000388325.1	P55268
LAMB2	ENST00000469665.1 link	n.473G>A	non_coding_transcript_exon_variant	Exon 3 of 3	2
LAMB2	ENST00000477225.1 link	n.*212G>A	downstream_gene_variant		2

Frequencies

GnomAD3 genomes

AF:

0.00710

AC:

1080

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00198

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00641

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.0414

Gnomad FIN

AF:

0.00292

Gnomad MID

AF:

0.00949

Gnomad NFE

AF:

0.00960

Gnomad OTH

AF:

0.00525

GnomAD2 exomes

AF:

0.0115

AC:

2856

AN:

248064

AF XY:

0.0142

show subpopulations

Gnomad AFR exome

AF:

0.00135

Gnomad AMR exome

AF:

0.00422

Gnomad ASJ exome

AF:

0.00119

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00330

Gnomad NFE exome

AF:

0.00868

Gnomad OTH exome

AF:

0.0113

GnomAD4 exome

AF:

0.0121

AC:

17665

AN:

1457038

Hom.:

240

Cov.:

AF XY:

0.0135

AC XY:

9803

AN XY:

725086

show subpopulations

African (AFR)

AF:

0.00114

AC:

AN:

33478

American (AMR)

AF:

0.00438

AC:

196

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.000918

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0510

AC:

4403

AN:

86258

European-Finnish (FIN)

AF:

0.00284

AC:

138

AN:

48638

Middle Eastern (MID)

AF:

0.0260

AC:

150

AN:

5768

European-Non Finnish (NFE)

AF:

0.0107

AC:

11953

AN:

1111984

Other (OTH)

AF:

0.0126

AC:

763

AN:

60358

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.485

Heterozygous variant carriers

1205

2410

3615

4820

6025

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

490

980

1470

1960

2450

<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:

0.00706

AC:

1076

AN:

152330

Hom.:

Cov.:

AF XY:

0.00758

AC XY:

565

AN XY:

74492

show subpopulations

African (AFR)

AF:

0.00197

AC:

AN:

41576

American (AMR)

AF:

0.00640

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.000288

AC:

AN:

3472

East Asian (EAS)

AF:

0.000193

AC:

AN:

5180

South Asian (SAS)

AF:

0.0413

AC:

199

AN:

4824

European-Finnish (FIN)

AF:

0.00292

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00958

AC:

652

AN:

68028

Other (OTH)

AF:

0.00473

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

112

167

223

279

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

110

<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:

0.00401

Hom.:

Bravo

AF:

0.00622

Asia WGS

AF:

0.0150

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Pierson syndrome;C3280113:LAMB2-related infantile-onset nephrotic syndrome

Benign:2

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Oct 05, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:2

Apr 08, 2021

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

not specified

Benign:1

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.85

CADD

Benign

(source)

DANN

Benign

0.46

PhyloP100

0.53

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Mutation Taster

=100/0

polymorphism (auto)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.11

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