rs782047461

chr6-112254053-G-Achr6-112254053-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001105206.3(LAMA4):c.98C>T(p.Pro33Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,453,302 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 11/19 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. P33A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: LAMA4 NM_001105206.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.66

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]

LAMA4-AS1 (HGNC:40333): (LAMA4 antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15095207).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LAMA4	NM_001105206.3	c.98C>T	p.Pro33Leu	missense_variant	2/39	ENST00000230538.12
LAMA4-AS1	NR_121193.1	n.181+17137G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LAMA4	ENST00000230538.12	c.98C>T	p.Pro33Leu	missense_variant	2/39	1	NM_001105206.3	A1
LAMA4-AS1	ENST00000433684.6	n.684+17137G>A		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000436 AC: 1 AN: 229426 Hom.: 0 AF XY: 0.00000803 AC XY: 1 AN XY: 124510

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000347

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000138 AC: 2 AN: 1453302 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 722068

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000118

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.02e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ExAC AF: 0.00000825 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.075
BayesDel_addAF	Benign	-0.070	T
BayesDel_noAF	Benign	-0.34
Cadd	Benign	23
Dann	Uncertain	1.0
DEOGEN2	Benign	0.0069	T;T;T;T;.;T;.;.;T;.;.;.
Eigen	Benign	-0.36
Eigen_PC	Benign	-0.23
FATHMM_MKL	Benign	0.41	N
LIST_S2	Benign	0.81	T;.;.;T;T;T;T;T;T;.;.;T
M_CAP	Benign	0.0092	T
MetaRNN	Benign	0.15	T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	0.70	N;N;N;N;N;N;N
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-0.72	N;N;N;N;N;N;N;D;D;D;D;D
REVEL	Benign	0.17
Sift	Benign	0.28	T;T;T;T;T;T;T;T;T;D;D;D
Sift4G	Uncertain	0.052	T;T;T;T;.;.;D;.;.;D;D;.
Polyphen		0.021	.;.;.;.;.;.;B;.;.;B;B;B
Vest4		0.17
MutPred		0.56		Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);Loss of disorder (P = 0.0272);
MVP		0.52
MPC		0.12
ClinPred		0.23	T
GERP RS		3.4
gMVP		0.57

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs782047461; hg19: chr6-112575255;