rs151009169

Positions:

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_StrongBS1_Supporting

The NM_000426.4(LAMA2):c.6002G>A(p.Arg2001Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000126 in 1,608,142 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00027 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00011 ( 1 hom. )

Consequence

LAMA2
NM_000426.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:2

Conservation

PhyloP100: 3.39

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0069534183).

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.00027 (41/151946) while in subpopulation EAS AF= 0.00559 (29/5184). AF 95% confidence interval is 0.004. There are 0 homozygotes in gnomad4. There are 15 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LAMA2	NM_000426.4 linkuse as main transcript	c.6002G>A	p.Arg2001Lys	missense_variant	42/65	ENST00000421865.3	NP_000417.3
LAMA2	NM_001079823.2 linkuse as main transcript	c.6002G>A	p.Arg2001Lys	missense_variant	42/64		NP_001073291.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
LAMA2	ENST00000421865.3 linkuse as main transcript	c.6002G>A	p.Arg2001Lys	missense_variant	42/65	5	NM_000426.4	ENSP00000400365.2	P24043
LAMA2	ENST00000618192.5 linkuse as main transcript	c.6266G>A	p.Arg2089Lys	missense_variant	43/66	5		ENSP00000480802.2	A0A087WX80
LAMA2	ENST00000617695.5 linkuse as main transcript	c.6002G>A	p.Arg2001Lys	missense_variant	42/64	5		ENSP00000481744.2	A0A087WYF1

Frequencies

GnomAD3 genomes

AF:

0.000270

AC:

AN:

151826

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000725

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000460

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00558

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000479

GnomAD3 exomes

AF:

0.000271

AC:

AN:

250614

Hom.:

AF XY:

0.000221

AC XY:

AN XY:

135472

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00348

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000327

GnomAD4 exome

AF:

0.000111

AC:

161

AN:

1456196

Hom.:

Cov.:

AF XY:

0.000101

AC XY:

AN XY:

724786

show subpopulations

Gnomad4 AFR exome

AF:

0.0000600

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00225

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.03e-7

Gnomad4 OTH exome

AF:

0.00111

GnomAD4 genome

AF:

0.000270

AC:

AN:

151946

Hom.:

Cov.:

AF XY:

0.000202

AC XY:

AN XY:

74270

show subpopulations

Gnomad4 AFR

AF:

0.0000723

Gnomad4 AMR

AF:

0.000459

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00559

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000474

Alfa

AF:

0.000244

Hom.:

Bravo

AF:

0.000230

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000264

AC:

Asia WGS

AF:

0.00231

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:4

Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Mar 30, 2022	BP4 -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Nov 10, 2014	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	May 07, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jul 28, 2017	A variant of uncertain significance has been identified in the LAMA2 gene. The R2001K variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The R2001K variant is observed in 29/8596 (0.3%) alleles from individuals of East Asian background (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). This substitution occurs at a position that is conserved across species. However, the R2001K variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

LAMA2-related muscular dystrophy

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

LAMA2-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Apr 18, 2022

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

0.090

BayesDel_addAF

Benign

-0.56

BayesDel_noAF

Benign

-0.57

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.011

.;T;T

Eigen

Benign

-0.36

Eigen_PC

Benign

-0.22

FATHMM_MKL

Uncertain

0.91

LIST_S2

Benign

0.56

T;T;T

M_CAP

Benign

0.0091

MetaRNN

Benign

0.0070

T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.5

.;.;L

PrimateAI

Benign

0.41

PROVEAN

Benign

-0.080

.;.;N

REVEL

Benign

0.11

Sift

Benign

0.62

.;.;T

Polyphen

0.028

.;.;B

Vest4

0.23

MVP

0.49

MPC

0.12

ClinPred

0.017

GERP RS

4.7

Varity_R

0.12

gMVP

0.45

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over