rs3752579

chr6-112172687-A-T

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_001105206.3(LAMA4):c.1475T>A(p.Leu492His) variant causes a missense change. The variant allele was found at a frequency of 0.00124 in 1,613,914 control chromosomes in the GnomAD database, including 33 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin UniProt.

• Frequency:
  • Genomes: 𝑓 0.0012 (1 hom., cov: 32)
  • Exomes 𝑓: 0.0012 (32 hom.)
• Consequence: LAMA4 NM_001105206.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:9
• Conservation: PhyloP100: 5.57

Genes affected

LAMA4 (HGNC:6484): (laminin subunit alpha 4) Laminins, a family of extracellular matrix glycoproteins, are the major noncollagenous constituent of basement membranes. They have been implicated in a wide variety of biological processes including cell adhesion, differentiation, migration, signaling, neurite outgrowth and metastasis. Laminins are composed of 3 non identical chains: laminin alpha, beta and gamma (formerly A, B1, and B2, respectively) and they form a cruciform structure consisting of 3 short arms, each formed by a different chain, and a long arm composed of all 3 chains. Each laminin chain is a multidomain protein encoded by a distinct gene. Several isoforms of each chain have been described. Different alpha, beta and gamma chain isomers combine to give rise to different heterotrimeric laminin isoforms which are designated by Arabic numerals in the order of their discovery, i.e. alpha1beta1gamma1 heterotrimer is laminin 1. The biological functions of the different chains and trimer molecules are largely unknown, but some of the chains have been shown to differ with respect to their tissue distribution, presumably reflecting diverse functions in vivo. This gene encodes the alpha chain isoform laminin, alpha 4. The domain structure of alpha 4 is similar to that of alpha 3, both of which resemble truncated versions of alpha 1 and alpha 2, in that approximately 1,200 residues at the N-terminus (domains IV, V and VI) have been lost. Laminin, alpha 4 contains the C-terminal G domain which distinguishes all alpha chains from the beta and gamma chains. The RNA analysis from adult and fetal tissues revealed developmental regulation of expression, however, the exact function of laminin, alpha 4 is not known. Tissue-specific utilization of alternative polyA-signal has been described in literature. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Benign. Variant got -13 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.006751567).
• BP6: Variant 6-112172687-A-T is Benign according to our data. Variant chr6-112172687-A-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 44347.We mark this variant Likely_benign, oryginal submissions are: {Benign=6, Uncertain_significance=1}. Variant chr6-112172687-A-T is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.00125 (1823/1461704) while in subpopulation EAS AF= 0.0281 (1114/39698). AF 95% confidence interval is 0.0267. There are 32 homozygotes in gnomad4_exome. There are 880 alleles in male gnomad4_exome subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High AC in GnomAd at 181 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LAMA4	NM_001105206.3	c.1475T>A	p.Leu492His	missense_variant	12/39	ENST00000230538.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LAMA4	ENST00000230538.12	c.1475T>A	p.Leu492His	missense_variant	12/39	1	NM_001105206.3	A1

Frequencies

GnomAD3 genomes AF: 0.00119 AC: 181 AN: 152092 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.0000966

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00557

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.0153

Gnomad SAS AF: 0.000829

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.00314 AC: 789 AN: 251350 Hom.: 6 AF XY: 0.00249 AC XY: 338 AN XY: 135830

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.0150

Gnomad ASJ exome AF: 0.0000992

Gnomad EAS exome AF: 0.0133

Gnomad SAS exome AF: 0.000261

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000440

Gnomad OTH exome AF: 0.00163

GnomAD4 exome AF: 0.00125 AC: 1823 AN: 1461704 Hom.: 32 Cov.: 33 AF XY: 0.00121 AC XY: 880 AN XY: 727140

Gnomad4 AFR exome AF: 0.0000896

Gnomad4 AMR exome AF: 0.0131

Gnomad4 ASJ exome AF: 0.000153

Gnomad4 EAS exome AF: 0.0281

Gnomad4 SAS exome AF: 0.000197

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000432

Gnomad4 OTH exome AF: 0.000845

GnomAD4 genome AF: 0.00118 AC: 180 AN: 152210 Hom.: 1 Cov.: 32 AF XY: 0.00144 AC XY: 107 AN XY: 74414

Gnomad4 AFR AF: 0.0000963

Gnomad4 AMR AF: 0.00556

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.0151

Gnomad4 SAS AF: 0.000829

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.000946

Alfa AF: 0.000949 Hom.: 1

Bravo AF: 0.00181

ExAC AF: 0.00277 AC: 336

Asia WGS AF: 0.00808 AC: 28 AN: 3478

EpiCase AF: 0.000218

EpiControl AF: 0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:9

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Uncertain:1 Benign:5

Benign, criteria provided, single submitter	clinical testing	GeneDx	Apr 08, 2015	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. -
Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Oct 22, 2015	p.Leu485His in exon 12 of LAMA4: This variant is not expected to have clinical s ignificance because it has been identified in 1.6% (189/11562) of Latino chromos omes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs3752579). -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Uncertain significance, no assertion criteria provided	clinical testing	Stanford Center for Inherited Cardiovascular Disease, Stanford University	Jul 24, 2015	Note this variant was found in clinical genetic testing performed by one or more labs who may also submit to ClinVar. Thus any internal case data may overlap with the internal case data of other labs. The interpretation reviewed below is that of the Stanford Center for Inherited Cardiovascular Disease. LAMA4 p.Leu485His We classify this as a VUS-probably benign. This variant has not been published in the literature in association with cardiomyopathy. By contrast, it has been detected in presumably unaffected individuals in population datasets (see below). Furthermore, the LAMA4 gene might rightly be called a “gene of uncertain significance” given the paucity of data: there are only 2 variants listed in HGMD for this gene, both associated with DCM. No variation at residues near Leu485His has been associated with cardiomyopathy (HGMD professional version as of January 17, 2014). This is a non-conservative amino acid change, resulting in the replacement of a nonpolar Leucine with a positively-charged Histidine. This location is conserved across species. In silico analysis was inconsistent with regard to the effect on protein structure/function. In total the variant has been seen in 10 individuals from publicly available population datasets. It was observed in 10 individuals in the 1000 Genomes Project: 6 Han Chinese, 2 Japanese, and 2 Mexican (http://browser.1000genomes.org/index.htm) as of April 15, 2014. This raises the possibility that it may be a benign variant found more often in certain ethnicities. This variant is not listed in the NHLBI Exome Sequencing Project dataset (http://evs.gs.washington.edu/EVS/), which currently includes variant calls on ~3500 Caucasian and ~1800 African American individuals. The phenotype of the ESP individuals is not publicly available, however the cohorts that were merged to create this dataset were all either general population samples or samples recruited for common cardiovascular disease such as hypertension. It is listed in dpSNP as rs3752579, with multiple submitters including 1000 Genomes. -

Dilated cardiomyopathy 1JJ Benign:2

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 24, 2024	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 11, 2023	- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

research

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Jun 24, 2013

- -

Hypertrophic cardiomyopathy;C0878544:Cardiomyopathy Benign:1

Benign, criteria provided, single submitter

clinical testing

Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego

Dec 13, 2018

- -

Cardiovascular phenotype Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

May 14, 2016

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.40	T
BayesDel_noAF	Benign	-0.33
Cadd	Pathogenic	26
Dann	Uncertain	0.98
DEOGEN2	Benign	0.38	T;T;T;T
Eigen	Uncertain	0.42
Eigen_PC	Uncertain	0.40
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.75	T;.;.;T
MetaRNN	Benign	0.0068	T;T;T;T
MetaSVM	Benign	-1.2	T
MutationTaster	Benign	0.98	D;D;D;D
PrimateAI	Uncertain	0.52	T
PROVEAN	Pathogenic	-5.8	D;D;D;D
REVEL	Benign	0.23
Sift	Uncertain	0.0010	D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D
Vest4		0.62
MVP		0.46
MPC		0.61
ClinPred		0.11	T
GERP RS		5.5
gMVP		0.71

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

Other links and lift over

dbSNP: rs3752579; hg19: chr6-112493889; COSMIC: COSV100037688;