chr6-129369996-G-T

Position:

chr6-129369996-G-T

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_000426.4(LAMA2):c.4959+6G>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 0.000502 in 1,612,122 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0024 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00030 ( 0 hom. )

Consequence

LAMA2
NM_000426.4 splice_donor_region, intron

Scores

Splicing: ADA: 0.00005205

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:5

Conservation

PhyloP100: 1.75

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 -9 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.62).

BP6

Variant 6-129369996-G-T is Benign according to our data. Variant chr6-129369996-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 355273.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=2, Likely_benign=3}.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00244 (372/152288) while in subpopulation AFR AF= 0.00823 (342/41554). AF 95% confidence interval is 0.00751. There are 0 homozygotes in gnomad4. There are 173 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LAMA2	NM_000426.4 linkuse as main transcript	c.4959+6G>T		splice_donor_region_variant, intron_variant		ENST00000421865.3	NP_000417.3
LAMA2	NM_001079823.2 linkuse as main transcript	c.4959+6G>T		splice_donor_region_variant, intron_variant			NP_001073291.2

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Protein	Appris
LAMA2	ENST00000421865.3 linkuse as main transcript	c.4959+6G>T	splice_donor_region_variant, intron_variant	5	NM_000426.4	ENSP00000400365
LAMA2	ENST00000617695.5 linkuse as main transcript	c.4959+6G>T	splice_donor_region_variant, intron_variant	5		ENSP00000481744
LAMA2	ENST00000618192.5 linkuse as main transcript	c.5223+6G>T	splice_donor_region_variant, intron_variant	5		ENSP00000480802	P1
LAMA2	ENST00000687590.1 linkuse as main transcript	n.1379+6G>T	splice_donor_region_variant, intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes

AF:

0.00242

AC:

368

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00816

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00131

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:

0.0000882

Gnomad OTH

AF:

0.00191

GnomAD3 exomes

AF:

0.000615

AC:

154

AN:

250280

Hom.:

AF XY:

0.000451

AC XY:

AN XY:

135332

show subpopulations

Gnomad AFR exome

AF:

0.00791

Gnomad AMR exome

AF:

0.000551

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:

0.0000532

Gnomad OTH exome

AF:

0.000164

GnomAD4 exome

AF:

0.000300

AC:

438

AN:

1459834

Hom.:

Cov.:

AF XY:

0.000256

AC XY:

186

AN XY:

726410

show subpopulations

Gnomad4 AFR exome

AF:

0.00922

Gnomad4 AMR exome

AF:

0.000626

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000649

Gnomad4 OTH exome

AF:

0.000497

GnomAD4 genome

AF:

0.00244

AC:

372

AN:

152288

Hom.:

Cov.:

AF XY:

0.00232

AC XY:

173

AN XY:

74464

show subpopulations

Gnomad4 AFR

AF:

0.00823

Gnomad4 AMR

AF:

0.00131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00189

Alfa

AF:

0.000832

Hom.:

Bravo

AF:

0.00271

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:4

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Apr 21, 2017	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Likely benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	May 01, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2023	LAMA2: BP4, BS1 -

Congenital muscular dystrophy due to partial LAMA2 deficiency

Uncertain:1

Uncertain significance, 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, 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. -

LAMA2-related muscular dystrophy

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.62

CADD

Benign

DANN

Benign

0.93

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000052

dbscSNV1_RF

Benign

0.024

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