rs141363186

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_000426.4(LAMA2):c.1621A>G(p.Ser541Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00266 in 1,613,948 control chromosomes in the GnomAD database, including 10 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/22 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. S541R) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0018 ( 2 hom., cov: 32)

Exomes 𝑓: 0.0028 ( 8 hom. )

Consequence

LAMA2
NM_000426.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 0.793

Publications

8 publications found

Variant links:

Genes affected

LAMA2 (HGNC:6482): (laminin subunit alpha 2) Laminin, an extracellular protein, is a major component of the basement membrane. It is thought to mediate the attachment, migration, and organization of cells into tissues during embryonic development by interacting with other extracellular matrix components. It is composed of three subunits, alpha, beta, and gamma, which are bound to each other by disulfide bonds into a cross-shaped molecule. This gene encodes the alpha 2 chain, which constitutes one of the subunits of laminin 2 (merosin) and laminin 4 (s-merosin). Mutations in this gene have been identified as the cause of congenital merosin-deficient muscular dystrophy. Two transcript variants encoding different proteins have been found for this gene. [provided by RefSeq, Jul 2008]

LAMA2 Gene-Disease associations (from GenCC):

congenital merosin-deficient muscular dystrophy 1A
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Myriad Women’s Health, G2P
LAMA2-related muscular dystrophy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
muscular dystrophy, limb-girdle, autosomal recessive 23
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

LAMA2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0159055).

BP6

Variant 6-129192692-A-G is Benign according to our data. Variant chr6-129192692-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 92939.

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LAMA2	NM_000426.4 link	c.1621A>G	p.Ser541Gly	missense_variant	Exon 12 of 65	ENST00000421865.3	NP_000417.3
LAMA2	NM_001079823.2 link	c.1621A>G	p.Ser541Gly	missense_variant	Exon 12 of 64		NP_001073291.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LAMA2	ENST00000421865.3 link	c.1621A>G	p.Ser541Gly	missense_variant	Exon 12 of 65	5	NM_000426.4	ENSP00000400365.2		P24043

Frequencies

GnomAD3 genomes

AF:

0.00178

AC:

271

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000589

Gnomad ASJ

AF:

0.00115

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00207

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00313

Gnomad OTH

AF:

0.00143

GnomAD2 exomes

AF:

0.00168

AC:

422

AN:

251268

AF XY:

0.00173

show subpopulations

Gnomad AFR exome

AF:

0.000494

Gnomad AMR exome

AF:

0.000897

Gnomad ASJ exome

AF:

0.00228

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00279

Gnomad OTH exome

AF:

0.00147

GnomAD4 exome

AF:

0.00275

AC:

4023

AN:

1461638

Hom.:

Cov.:

AF XY:

0.00268

AC XY:

1952

AN XY:

727126

show subpopulations

African (AFR)

AF:

0.000478

AC:

AN:

33480

American (AMR)

AF:

0.000984

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00245

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.00148

AC:

128

AN:

86252

European-Finnish (FIN)

AF:

0.0000375

AC:

AN:

53400

Middle Eastern (MID)

AF:

0.00173

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00325

AC:

3615

AN:

1111798

Other (OTH)

AF:

0.00238

AC:

144

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.474

Heterozygous variant carriers

194

388

581

775

969

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

138

276

414

552

690

<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:

0.00178

AC:

271

AN:

152310

Hom.:

Cov.:

AF XY:

0.00167

AC XY:

124

AN XY:

74474

show subpopulations

African (AFR)

AF:

0.000722

AC:

AN:

41576

American (AMR)

AF:

0.000588

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00115

AC:

AN:

3468

East Asian (EAS)

AF:

0.000193

AC:

AN:

5176

South Asian (SAS)

AF:

0.00207

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.0000942

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00313

AC:

213

AN:

68022

Other (OTH)

AF:

0.00142

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome 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

Alfa

AF:

0.00246

Hom.:

Bravo

AF:

0.00177

TwinsUK

AF:

0.00378

AC:

ALSPAC

AF:

0.00727

AC:

ESP6500AA

AF:

0.000908

AC:

ESP6500EA

AF:

0.00360

AC:

ExAC

AF:

0.00172

AC:

209

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.00289

EpiControl

AF:

0.00279

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:9

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:4

Apr 17, 2015

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 05, 2022

Mayo Clinic Laboratories, Mayo Clinic

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BP4 -

Jan 08, 2020

Athena Diagnostics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

The LAMA2 p.Ser541Gly variant was not identified in the literature nor was it identified in Cosmic or LOVD 3.0. The variant was identified in dbSNP (ID: rs141363186) and ClinVar (classified as benign by Invitae, likely benign by GeneDx and a VUS by EGL Genetics, Genetics Services Laboratory (University of Chicago) and Athena Diagnostics). The variant was also identified in control databases in 465 of 282658 chromosomes (1 homozygous) at a frequency of 0.001645 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: European (non-Finnish) in 357 of 129082 chromosomes (freq: 0.002766), Ashkenazi Jewish in 23 of 10368 chromosomes (freq: 0.002218), Other in 10 of 7222 chromosomes (freq: 0.001385), South Asian in 34 of 30616 chromosomes (freq: 0.001111), Latino in 31 of 35400 chromosomes (freq: 0.000876) and African in 10 of 24916 chromosomes (freq: 0.000401), while the variant was not observed in the East Asian and European (Finnish) populations. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. The p.Ser541 residue is not conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) do not suggest a high likelihood of impact to the protein; however, this information is not predictive enough to rule out pathogenicity. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as likely benign. -

Jan 14, 2021

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mar 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

LAMA2: BP4, BS2 -

not specified

Uncertain:1Benign:1

Aug 21, 2015

Genetic Services Laboratory, University of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 22, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: LAMA2 c.1621A>G (p.Ser541Gly) results in a non-conservative amino acid change located in the Laminin IV domain (IPR000034) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0027 in 1613948 control chromosomes in the gnomAD database, including 10 homozygotes. The observed variant frequency is approximately 1.19 fold of the estimated maximal expected allele frequency for a pathogenic variant in LAMA2 causing Laminin Alpha 2-Related Dystrophy phenotype (0.0022) suggesting the variant may be benign. c.1621A>G has been reported in the literature in a homozygous and compound heterozygous individual with an unspecified suspected muscular disorder, without evidence of causality (e.g. Thuriot_2020). This report does not provide unequivocal conclusions about association of the variant with Laminin Alpha 2-Related Dystrophy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 32337335). ClinVar contains an entry for this variant (Variation ID: 92939). Based on the evidence outlined above, the variant was classified as likely benign. -

Congenital muscular dystrophy due to partial LAMA2 deficiency

Uncertain:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Inborn genetic diseases

Benign:1

Sep 26, 2024

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

LAMA2-related muscular dystrophy

Benign:1

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Intellectual disability

Benign:1

Apr 24, 2019

Cambridge Genomics Laboratory, East Genomic Laboratory Hub, NHS Genomic Medicine Service

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

LAMA2-related disorder

Benign:1

Aug 07, 2022

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.075

BayesDel_addAF

Benign

-0.57

BayesDel_noAF

Benign

-0.58

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.030

.;T;T

Eigen

Benign

-0.55

Eigen_PC

Benign

-0.48

FATHMM_MKL

Benign

0.61

LIST_S2

Benign

0.80

T;T;T

M_CAP

Benign

0.0051

MetaRNN

Benign

0.016

T;T;T

MetaSVM

Benign

-0.97

MutationAssessor

Benign

1.9

.;.;L

PhyloP100

0.79

PrimateAI

Benign

0.27

PROVEAN

Benign

-2.2

.;.;N

REVEL

Benign

0.047

Sift

Benign

0.043

.;.;D

Polyphen

0.020

.;.;B

Vest4

0.15

MVP

0.45

MPC

0.083

ClinPred

0.0067

GERP RS

-0.47

Varity_R

0.12

gMVP

0.30

Mutation Taster

=96/4

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