rs779975082

Positions:

chr6-129143973-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM5PP3_Moderate

The NM_000426.4(LAMA2):c.712G>A(p.Ala238Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000384 in 1,460,168 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A238D) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000038 ( 0 hom. )

Consequence

LAMA2
NM_000426.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 9.94

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_pathogenic. Variant got 6 ACMG points.

PM1

In a domain Laminin N-terminal (size 251) in uniprot entity LAMA2_HUMAN there are 14 pathogenic changes around while only 1 benign (93%) in NM_000426.4

PM5

Other missense variant is known to change same aminoacid residue: Variant chr6-129143974-C-A is described in Lovd as [Pathogenic].

PP3

MetaRNN computational evidence supports a deleterious effect, 0.904

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LAMA2	NM_000426.4 linkuse as main transcript	c.712G>A	p.Ala238Thr	missense_variant	5/65	ENST00000421865.3	NP_000417.3
LAMA2	NM_001079823.2 linkuse as main transcript	c.712G>A	p.Ala238Thr	missense_variant	5/64		NP_001073291.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LAMA2	ENST00000421865.3 linkuse as main transcript	c.712G>A	p.Ala238Thr	missense_variant	5/65	5	NM_000426.4	ENSP00000400365

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000279

AC:

AN:

250812

Hom.:

AF XY:

0.0000295

AC XY:

AN XY:

135546

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000529

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000384

AC:

AN:

1460168

Hom.:

Cov.:

AF XY:

0.0000399

AC XY:

AN XY:

726440

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000477

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000710

Hom.:

Bravo

AF:

0.0000264

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.0000546

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

LAMA2-related muscular dystrophy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 01, 2022

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 238 of the LAMA2 protein (p.Ala238Thr). This variant is present in population databases (rs779975082, gnomAD 0.004%). This missense change has been observed in individual(s) with clinical features of congenital muscular dystrophy (PMID: 31983221). ClinVar contains an entry for this variant (Variation ID: 571211). 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 not expected to disrupt LAMA2 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Mar 29, 2019

- -

Merosin deficient congenital muscular dystrophy;C4748327:Muscular dystrophy, limb-girdle, autosomal recessive 23

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Aug 12, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.74

BayesDel_addAF

Pathogenic

0.33

BayesDel_noAF

Pathogenic

0.36

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.061

.;T;D

Eigen

Pathogenic

0.96

Eigen_PC

Pathogenic

0.87

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.92

D;D;D

M_CAP

Uncertain

0.12

MetaRNN

Pathogenic

0.90

D;D;D

MetaSVM

Uncertain

0.60

MutationAssessor

Pathogenic

3.4

.;.;M

MutationTaster

Benign

1.0

PrimateAI

Pathogenic

0.82

PROVEAN

Uncertain

-3.8

.;.;D

REVEL

Pathogenic

0.82

Sift

Pathogenic

0.0

.;.;D

Polyphen

1.0

.;.;D

Vest4

0.95

MVP

0.91

MPC

0.47

ClinPred

0.97

GERP RS

5.4

Varity_R

0.88

gMVP

0.78

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