9-131052933-G-T

Variant names:

• chr9-131052933-G-T
• rs753991024
• NM_006059.4:c.1907G>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_006059.4(LAMC3):​c.1907G>T​(p.Arg636Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R636H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LAMC3 NM_006059.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.02
• Publications: 0 publications found

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3303369).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LAMC3	NM_006059.4	c.1907G>T	p.Arg636Leu	missense_variant	Exon 11 of 28	ENST00000361069.9	NP_006050.3
LAMC3	XM_011518121.2	c.1907G>T	p.Arg636Leu	missense_variant	Exon 11 of 28		XP_011516423.1
LAMC3	XM_006716921.3	c.1907G>T	p.Arg636Leu	missense_variant	Exon 11 of 23		XP_006716984.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LAMC3	ENST00000361069.9	c.1907G>T	p.Arg636Leu	missense_variant	Exon 11 of 28	2	NM_006059.4	ENSP00000354360.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.47
CADD	Benign	14
DANN	Uncertain	0.99
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.92
Eigen_PC	Benign	-0.99
FATHMM_MKL	Benign	0.25	N
LIST_S2	Benign	0.43	T
M_CAP	Benign	0.047	D
MetaRNN	Benign	0.33	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.0	M
PhyloP100		1.0
PrimateAI	Benign	0.31	T
PROVEAN	Uncertain	-4.0	D
REVEL	Benign	0.062
Sift	Benign	0.071	T
Sift4G	Uncertain	0.032	D
Polyphen		0.24	B
Vest4		0.47
MutPred		0.55		Loss of disorder (P = 0.0675);
MVP		0.42
MPC		0.43
ClinPred		0.69	D
GERP RS		1.3
Varity_R		0.24
gMVP		0.58
Mutation Taster		=99/1	polymorphism

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

Other links and lift over

dbSNP: rs753991024; hg19: chr9-133928320;