chr6-129391480-AC-A

Position:

• chr6-129391480-AC-A

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP6_Very_Strong BS1 BS2

The NM_000426.4(LAMA2):​c.5072-6delC variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00152 in 1,611,928 control chromosomes in the GnomAD database, including 69 homozygotes. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0018 (5 hom., cov: 32)
  • Exomes 𝑓: 0.0015 (64 hom.)
• Consequence: LAMA2 NM_000426.4 splice_region, intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 0.529

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 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -16 ACMG points.

• BP6: Variant 6-129391480-AC-A is Benign according to our data. Variant chr6-129391480-AC-A is described in ClinVar as [Likely_benign]. Clinvar id is 92965.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.00183 (279/152160) while in subpopulation AMR AF= 0.0169 (258/15280). AF 95% confidence interval is 0.0152. There are 5 homozygotes in gnomad4. There are 142 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 5 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LAMA2	NM_000426.4	c.5072-6delC		splice_region_variant, intron_variant		ENST00000421865.3	NP_000417.3
LAMA2	NM_001079823.2	c.5072-6delC		splice_region_variant, intron_variant			NP_001073291.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LAMA2	ENST00000421865.3	c.5072-6delC		splice_region_variant, intron_variant		5	NM_000426.4	ENSP00000400365.2
LAMA2	ENST00000618192.5	c.5336-6delC		splice_region_variant, intron_variant		5		ENSP00000480802.2
LAMA2	ENST00000617695.5	c.5072-6delC		splice_region_variant, intron_variant		5		ENSP00000481744.2
LAMA2	ENST00000687590.1	n.1492-6delC		splice_region_variant, intron_variant

Frequencies

GnomAD3 genomes AF: 0.00183 AC: 278 AN: 152042 Hom.: 5 Cov.: 32

Gnomad AFR AF: 0.000338

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0168

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: 0.0000588

Gnomad OTH AF: 0.00144

GnomAD3 exomes AF: 0.00702 AC: 1752 AN: 249504 Hom.: 51 AF XY: 0.00505 AC XY: 684 AN XY: 135362

Gnomad AFR exome AF: 0.000194

Gnomad AMR exome AF: 0.0499

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000163

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000354

Gnomad OTH exome AF: 0.00313

GnomAD4 exome AF: 0.00149 AC: 2171 AN: 1459768 Hom.: 64 Cov.: 31 AF XY: 0.00120 AC XY: 871 AN XY: 726350

Gnomad4 AFR exome AF: 0.000209

Gnomad4 AMR exome AF: 0.0464

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000162

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000630

Gnomad4 OTH exome AF: 0.00111

GnomAD4 genome AF: 0.00183 AC: 279 AN: 152160 Hom.: 5 Cov.: 32 AF XY: 0.00191 AC XY: 142 AN XY: 74388

Gnomad4 AFR AF: 0.000337

Gnomad4 AMR AF: 0.0169

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000588

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00203 Hom.: 0

Bravo AF: 0.00422

Asia WGS AF: 0.000577 AC: 2 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jul 05, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Aug 27, 2015	- -

LAMA2-related muscular dystrophy Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 01, 2024

- -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 22, 2016

- -

Congenital Muscular Dystrophy, LAMA2-related Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs398123376; hg19: chr6-129712625;