chr6-129291619-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000426.4(LAMA2):c.2755C>T(p.Arg919Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000229 in 1,612,964 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R919G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00097 ( 1 hom., cov: 33)

Exomes 𝑓: 0.00015 ( 4 hom. )

Consequence

LAMA2
NM_000426.4 missense

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts U:2B:2

Conservation

PhyloP100: 1.00

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 Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.02902162).

BP6

Variant 6-129291619-C-T is Benign according to our data. Variant chr6-129291619-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 477457.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4_exome allele frequency = 0.000152 (222/1460650) while in subpopulation AFR AF= 0.00517 (173/33434). AF 95% confidence interval is 0.00454. There are 4 homozygotes in gnomad4_exome. There are 91 alleles in male gnomad4_exome subpopulation. Median coverage is 30. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 4 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LAMA2	NM_000426.4 link	c.2755C>T	p.Arg919Cys	missense_variant	Exon 20 of 65	ENST00000421865.3	NP_000417.3
LAMA2	NM_001079823.2 link	c.2755C>T	p.Arg919Cys	missense_variant	Exon 20 of 64		NP_001073291.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
LAMA2	ENST00000421865.3 link	c.2755C>T	p.Arg919Cys	missense_variant	Exon 20 of 65	5	NM_000426.4	ENSP00000400365.2	P24043
LAMA2	ENST00000618192.5 link	c.2755C>T	p.Arg919Cys	missense_variant	Exon 20 of 66	5		ENSP00000480802.2	A0A087WX80
LAMA2	ENST00000617695.5 link	c.2755C>T	p.Arg919Cys	missense_variant	Exon 20 of 64	5		ENSP00000481744.2	A0A087WYF1

Frequencies

GnomAD3 genomes

AF:

0.000959

AC:

146

AN:

152196

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00340

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000298

AC:

AN:

251358

Hom.:

AF XY:

0.000221

AC XY:

AN XY:

135850

show subpopulations

Gnomad AFR exome

AF:

0.00406

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000654

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000152

AC:

222

AN:

1460650

Hom.:

Cov.:

AF XY:

0.000125

AC XY:

AN XY:

726726

show subpopulations

Gnomad4 AFR exome

AF:

0.00517

Gnomad4 AMR exome

AF:

0.000134

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000139

Gnomad4 FIN exome

AF:

0.0000749

Gnomad4 NFE exome

AF:

0.00000450

Gnomad4 OTH exome

AF:

0.000298

GnomAD4 genome

AF:

0.000965

AC:

147

AN:

152314

Hom.:

Cov.:

AF XY:

0.000966

AC XY:

AN XY:

74496

show subpopulations

Gnomad4 AFR

AF:

0.00341

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000139

Hom.:

Bravo

AF:

0.000948

ESP6500AA

AF:

0.00204

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000387

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:2Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Dec 18, 2020

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

LAMA2-related muscular dystrophy

Benign:1

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.19

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.29

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.059

.;T;T

Eigen

Benign

0.089

Eigen_PC

Benign

0.00083

FATHMM_MKL

Benign

0.52

LIST_S2

Uncertain

0.89

D;D;D

MetaRNN

Benign

0.029

T;T;T

MetaSVM

Benign

-0.70

MutationAssessor

Uncertain

2.8

.;.;M

PrimateAI

Benign

0.21

PROVEAN

Uncertain

-2.7

.;.;D

REVEL

Benign

0.26

Sift

Benign

0.044

.;.;D

Polyphen

0.98

.;.;D

Vest4

0.43

MVP

0.81

MPC

0.38

ClinPred

0.077

GERP RS

4.0

Varity_R

0.32

gMVP

0.42

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