rs116422150

chr9-131052652-G-Achr9-131052652-G-C

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_006059.4(LAMC3):c.1792G>A(p.Gly598Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00268 in 1,613,700 control chromosomes in the GnomAD database, including 36 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0098 (17 hom., cov: 33)
  • Exomes 𝑓: 0.0019 (19 hom.)
• Consequence: LAMC3 NM_006059.4 missense
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 1.74

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.0036583543).
• BP6: Variant 9-131052652-G-A is Benign according to our data. Variant chr9-131052652-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 129453.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-131052652-G-A is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00977 (1487/152248) while in subpopulation AFR AF= 0.0264 (1095/41540). AF 95% confidence interval is 0.0251. There are 17 homozygotes in gnomad4. There are 696 alleles in male gnomad4 subpopulation. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 17 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LAMC3	NM_006059.4	c.1792G>A	p.Gly598Arg	missense_variant	10/28	ENST00000361069.9
LAMC3	XM_011518121.2	c.1792G>A	p.Gly598Arg	missense_variant	10/28
LAMC3	XM_006716921.3	c.1792G>A	p.Gly598Arg	missense_variant	10/23

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LAMC3	ENST00000361069.9	c.1792G>A	p.Gly598Arg	missense_variant	10/28	2	NM_006059.4	P1

Frequencies

GnomAD3 genomes AF: 0.00978 AC: 1488 AN: 152130 Hom.: 17 Cov.: 33

Gnomad AFR AF: 0.0265

Gnomad AMI AF: 0.0208

Gnomad AMR AF: 0.0151

Gnomad ASJ AF: 0.00433

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000622

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.00138

Gnomad OTH AF: 0.0134

GnomAD3 exomes AF: 0.00337 AC: 841 AN: 249576 Hom.: 9 AF XY: 0.00287 AC XY: 388 AN XY: 135268

Gnomad AFR exome AF: 0.0253

Gnomad AMR exome AF: 0.00626

Gnomad ASJ exome AF: 0.00469

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000196

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00136

Gnomad OTH exome AF: 0.00295

GnomAD4 exome AF: 0.00194 AC: 2832 AN: 1461452 Hom.: 19 Cov.: 35 AF XY: 0.00182 AC XY: 1323 AN XY: 727016

Gnomad4 AFR exome AF: 0.0276

Gnomad4 AMR exome AF: 0.00635

Gnomad4 ASJ exome AF: 0.00394

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000174

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00108

Gnomad4 OTH exome AF: 0.00441

GnomAD4 genome AF: 0.00977 AC: 1487 AN: 152248 Hom.: 17 Cov.: 33 AF XY: 0.00935 AC XY: 696 AN XY: 74440

Gnomad4 AFR AF: 0.0264

Gnomad4 AMR AF: 0.0152

Gnomad4 ASJ AF: 0.00433

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00138

Gnomad4 OTH AF: 0.0132

Alfa AF: 0.00254 Hom.: 6

Bravo AF: 0.0108

TwinsUK AF: 0.000809 AC: 3

ALSPAC AF: 0.000519 AC: 2

ESP6500AA AF: 0.0241 AC: 106

ESP6500EA AF: 0.00244 AC: 21

ExAC AF: 0.00349 AC: 424

Asia WGS AF: 0.00115 AC: 4 AN: 3478

EpiCase AF: 0.00234

EpiControl AF: 0.00196

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	Genetic Services Laboratory, University of Chicago	Aug 05, 2016	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Jul 24, 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. -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 28, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	Feb 27, 2017	- -

LAMC3-related condition Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

May 14, 2019

This variant is classified as 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	0.082
BayesDel_addAF	Benign	-0.67	T
BayesDel_noAF	Benign	-0.72
Cadd	Benign	10
Dann	Benign	0.53
DEOGEN2	Benign	0.030	T
Eigen	Benign	-0.89
Eigen_PC	Benign	-0.85
FATHMM_MKL	Benign	0.54	D
LIST_S2	Benign	0.33	T
MetaRNN	Benign	0.0037	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.6	L
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.062
Sift	Benign	0.59	T
Sift4G	Benign	0.62	T
Polyphen		0.014	B
Vest4		0.14
MutPred		0.49		Gain of solvent accessibility (P = 0.0789);
MVP		0.46
MPC		0.19
ClinPred		0.0042	T
GERP RS		2.4
Varity_R		0.055
gMVP		0.46

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: rs116422150; hg19: chr9-133928039;