rs73775410

Variant summary

Our verdict is Benign. Variant got -18 ACMG points: 0P and 18B. BP4_ModerateBP6_Very_StrongBA1

The NM_000426.4(LAMA2):c.6274+4C>T variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00459 in 1,591,668 control chromosomes in the GnomAD database, including 303 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.026 ( 173 hom., cov: 32)

Exomes 𝑓: 0.0024 ( 130 hom. )

Consequence

LAMA2
NM_000426.4 splice_donor_region, intron

Scores

Splicing: ADA: 0.0008636

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: 0.300

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:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -18 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.28).

BP6

Variant 6-129443072-C-T is Benign according to our data. Variant chr6-129443072-C-T is described in ClinVar as [Benign]. Clinvar id is 355286.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr6-129443072-C-T is described in Lovd as [Benign]. Variant chr6-129443072-C-T is described in Lovd as [Likely_benign].

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.087 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LAMA2	NM_000426.4 linkuse as main transcript	c.6274+4C>T		splice_donor_region_variant, intron_variant		ENST00000421865.3
LAMA2	NM_001079823.2 linkuse as main transcript	c.6274+4C>T		splice_donor_region_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Appris
LAMA2	ENST00000421865.3 linkuse as main transcript	c.6274+4C>T	splice_donor_region_variant, intron_variant	5	NM_000426.4
	ENST00000665046.1 linkuse as main transcript	n.976-1820G>A	intron_variant, non_coding_transcript_variant
LAMA2	ENST00000617695.5 linkuse as main transcript	c.6274+4C>T	splice_donor_region_variant, intron_variant	5
LAMA2	ENST00000618192.5 linkuse as main transcript	c.6538+4C>T	splice_donor_region_variant, intron_variant	5		P1

Frequencies

GnomAD3 genomes

AF:

0.0257

AC:

3904

AN:

151916

Hom.:

172

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0893

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00971

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000353

Gnomad OTH

AF:

0.0192

GnomAD3 exomes

AF:

0.00652

AC:

1586

AN:

243404

Hom.:

AF XY:

0.00460

AC XY:

606

AN XY:

131714

show subpopulations

Gnomad AFR exome

AF:

0.0885

Gnomad AMR exome

AF:

0.00373

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000138

Gnomad FIN exome

AF:

0.0000464

Gnomad NFE exome

AF:

0.000229

Gnomad OTH exome

AF:

0.00267

GnomAD4 exome

AF:

0.00235

AC:

3386

AN:

1439636

Hom.:

130

Cov.:

AF XY:

0.00206

AC XY:

1476

AN XY:

716894

show subpopulations

Gnomad4 AFR exome

AF:

0.0839

Gnomad4 AMR exome

AF:

0.00444

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000144

Gnomad4 FIN exome

AF:

0.0000189

Gnomad4 NFE exome

AF:

0.000122

Gnomad4 OTH exome

AF:

0.00561

GnomAD4 genome

AF:

0.0258

AC:

3919

AN:

152032

Hom.:

173

Cov.:

AF XY:

0.0252

AC XY:

1876

AN XY:

74300

show subpopulations

Gnomad4 AFR

AF:

0.0894

Gnomad4 AMR

AF:

0.00970

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000353

Gnomad4 OTH

AF:

0.0190

Alfa

AF:

0.0125

Hom.:

Bravo

AF:

0.0291

Asia WGS

AF:

0.00664

AC:

AN:

3476

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Mar 21, 2016

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

LAMA2-related muscular dystrophy

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Feb 01, 2024

- -

not provided

Benign:1

Benign, criteria provided, single submitter

clinical testing

Athena Diagnostics

Nov 20, 2017

- -

Congenital muscular dystrophy due to partial LAMA2 deficiency

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.28

Cadd

Benign

Dann

Benign

0.83

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00086

dbscSNV1_RF

Benign

0.16

SpliceAI score (max)

0.17

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