rs73658916

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_006059.4(LAMC3):c.2039C>T(p.Thr680Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00211 in 1,614,048 control chromosomes in the GnomAD database, including 30 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. T680T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0078 ( 18 hom., cov: 33)

Exomes 𝑓: 0.0015 ( 12 hom. )

Consequence

LAMC3
NM_006059.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: -2.90

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

occipital pachygyria and polymicrogyria
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P, Orphanet, Illumina
complex neurodevelopmental disorder
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

LAMC3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0069152415).

BP6

Variant 9-131057028-C-T is Benign according to our data. Variant chr9-131057028-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 378068.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00776 (1182/152308) while in subpopulation AFR AF = 0.0259 (1076/41560). AF 95% confidence interval is 0.0246. There are 18 homozygotes in GnomAd4. There are 547 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 18 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
LAMC3	NM_006059.4 link	c.2039C>T	p.Thr680Met	missense_variant	Exon 12 of 28	ENST00000361069.9	NP_006050.3
LAMC3	XM_011518121.2 link	c.2039C>T	p.Thr680Met	missense_variant	Exon 12 of 28		XP_011516423.1
LAMC3	XM_006716921.3 link	c.2039C>T	p.Thr680Met	missense_variant	Exon 12 of 23		XP_006716984.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LAMC3	ENST00000361069.9 link	c.2039C>T	p.Thr680Met	missense_variant	Exon 12 of 28	2	NM_006059.4	ENSP00000354360.4

Frequencies

GnomAD3 genomes

AF:

0.00775

AC:

1179

AN:

152190

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0259

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000779

Gnomad OTH

AF:

0.00478

GnomAD2 exomes

AF:

0.00228

AC:

574

AN:

251264

AF XY:

0.00183

show subpopulations

Gnomad AFR exome

AF:

0.0259

Gnomad AMR exome

AF:

0.00156

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000766

Gnomad OTH exome

AF:

0.000977

GnomAD4 exome

AF:

0.00152

AC:

2217

AN:

1461740

Hom.:

Cov.:

AF XY:

0.00136

AC XY:

992

AN XY:

727180

show subpopulations

African (AFR)

AF:

0.0272

AC:

910

AN:

33480

American (AMR)

AF:

0.00145

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.000220

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.0000375

AC:

AN:

53348

Middle Eastern (MID)

AF:

0.00156

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000942

AC:

1047

AN:

1111938

Other (OTH)

AF:

0.00273

AC:

165

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.472

Heterozygous variant carriers

129

257

386

514

643

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

112

168

224

280

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00776

AC:

1182

AN:

152308

Hom.:

Cov.:

AF XY:

0.00734

AC XY:

547

AN XY:

74480

show subpopulations

African (AFR)

AF:

0.0259

AC:

1076

AN:

41560

American (AMR)

AF:

0.00261

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000386

AC:

AN:

5180

South Asian (SAS)

AF:

0.000207

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000779

AC:

AN:

68024

Other (OTH)

AF:

0.00473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

112

169

225

281

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00361

Hom.:

Bravo

AF:

0.00904

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.00104

AC:

ESP6500AA

AF:

0.0250

AC:

110

ESP6500EA

AF:

0.00128

AC:

ExAC

AF:

0.00271

AC:

329

Asia WGS

AF:

0.00260

AC:

AN:

3478

EpiCase

AF:

0.000654

EpiControl

AF:

0.000593

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:4

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

Feb 22, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

not specified

Benign:2

Jun 16, 2016

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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.

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.072

BayesDel_addAF

Benign

-0.56

BayesDel_noAF

Benign

-0.56

CADD

Benign

3.6

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.052

Eigen

Benign

-0.96

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.082

LIST_S2

Benign

0.23

MetaRNN

Benign

0.0069

MetaSVM

Benign

-0.98

MutationAssessor

Benign

1.5

PhyloP100

-2.9

PrimateAI

Benign

0.28

PROVEAN

Benign

-0.37

REVEL

Benign

0.043

Sift

Benign

0.18

Sift4G

Benign

0.12

Vest4

0.20

ClinPred

0.0055

GERP RS

-0.94

Varity_R

0.046

gMVP

0.33

Mutation Taster

=95/5

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over