NM_006059.4:c.2227A>G

Variant names:

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_006059.4(LAMC3):c.2227A>G(p.Asn743Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000271 in 1,614,042 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00071 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00023 ( 2 hom. )

Consequence

LAMC3
NM_006059.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:4

Conservation

PhyloP100: 2.28

Variant links:

Genes affected

LAMC3 (HGNC:6494): (laminin subunit gamma 3) 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 gamma chain isoform laminin, gamma 3. The gamma 3 chain is most similar to the gamma 1 chain, and contains all the 6 domains expected of the gamma chain. It is a component of laminin 12. The gamma 3 chain is broadly expressed in skin, heart, lung, and the reproductive tracts. In skin, it is seen within the basement membrane of the dermal-epidermal junction at points of nerve penetration. Gamma 3 is also a prominent element of the apical surface of ciliated epithelial cells of lung, oviduct, epididymis, ductus deferens, and seminiferous tubules. The distribution of gamma 3-containing laminins along ciliated epithelial surfaces suggests that the apical laminins are important in the morphogenesis and structural stability of the ciliated processes of these cells. [provided by RefSeq, Aug 2011]

LAMC3 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 (MetaRNN=0.014074862).

BP6

Variant 9-131061103-A-G is Benign according to our data. Variant chr9-131061103-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 372404.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=2}. Variant chr9-131061103-A-G is described in Lovd as [Benign].

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LAMC3	NM_006059.4 link	c.2227A>G	p.Asn743Asp	missense_variant	Exon 13 of 28	ENST00000361069.9	NP_006050.3	Q9Y6N6Q8N2D6
LAMC3	XM_011518121.2 link	c.2227A>G	p.Asn743Asp	missense_variant	Exon 13 of 28		XP_011516423.1
LAMC3	XM_006716921.3 link	c.2227A>G	p.Asn743Asp	missense_variant	Exon 13 of 23		XP_006716984.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LAMC3	ENST00000361069.9 link	c.2227A>G	p.Asn743Asp	missense_variant	Exon 13 of 28	2	NM_006059.4	ENSP00000354360.4		Q9Y6N6

Frequencies

GnomAD3 genomes

AF:

0.000710

AC:

108

AN:

152178

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00198

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00634

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000342

AC:

AN:

251248

Hom.:

AF XY:

0.000353

AC XY:

AN XY:

135836

show subpopulations

Gnomad AFR exome

AF:

0.00203

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00457

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000440

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000226

AC:

330

AN:

1461746

Hom.:

Cov.:

AF XY:

0.000224

AC XY:

163

AN XY:

727186

show subpopulations

Gnomad4 AFR exome

AF:

0.00275

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00520

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000468

Gnomad4 OTH exome

AF:

0.000646

GnomAD4 genome

AF:

0.000709

AC:

108

AN:

152296

Hom.:

Cov.:

AF XY:

0.000658

AC XY:

AN XY:

74480

show subpopulations

Gnomad4 AFR

AF:

0.00197

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00634

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000325

Hom.:

Bravo

AF:

0.000756

ESP6500AA

AF:

0.00250

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000329

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:2

Nov 02, 2016

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The N743D variant in the LAMC3 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. Although not present in the homozygous state, the NHLBI ESP Exome Sequencing Project reports N743D was observed in 11/4406 alleles (0.25%) from individuals of African American background. The N743D variant is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. This substitution occurs at a position that is not conserved. In silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret N743D as a variant of uncertain significance. -

Feb 13, 2017

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Benign:2

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

LAMC3: BP4 -

Inborn genetic diseases

Benign:1

Sep 01, 2021

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely 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. -

LAMC3-related disorder

Benign:1

Feb 24, 2023

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.56

BayesDel_noAF

Benign

-0.59

CADD

Benign

DANN

Benign

0.66

DEOGEN2

Benign

0.098

Eigen

Benign

-0.36

Eigen_PC

Benign

-0.30

FATHMM_MKL

Uncertain

0.76

LIST_S2

Benign

0.67

M_CAP

Benign

0.047

MetaRNN

Benign

0.014

MetaSVM

Benign

-0.89

MutationAssessor

Benign

0.32

PrimateAI

Uncertain

0.49

PROVEAN

Uncertain

-2.8

REVEL

Benign

0.14

Sift

Benign

0.83

Sift4G

Benign

0.63

Polyphen

0.48

Vest4

0.20

MVP

0.74

MPC

0.41

ClinPred

0.075

GERP RS

3.7

Varity_R

0.27

gMVP

0.36

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.10

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