6-112254001-C-A

Variant names:

• chr6-112254001-C-A
• NM_001105206.3:c.150G>T
• LAMA4 p.Thr50Thr

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001105206.3(LAMA4):​c.150G>T​(p.Thr50Thr) variant causes a synonymous 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. T50T) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: LAMA4 NM_001105206.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.529
• Publications: 0 publications found

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]

ENSG00000281613 (HGNC:):

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

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.6).
• BP7: Synonymous conserved (PhyloP=-0.529 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001105206.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LAMA4	NM_001105206.3	MANE Select	c.150G>T	p.Thr50Thr	synonymous	Exon 2 of 39	NP_001098676.2	Q16363-1
	LAMA4	NM_001105207.3		c.150G>T	p.Thr50Thr	synonymous	Exon 2 of 39	NP_001098677.2	A0A0A0MTC7
	LAMA4	NM_002290.5		c.150G>T	p.Thr50Thr	synonymous	Exon 2 of 39	NP_002281.3	Q16363-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LAMA4	ENST00000230538.12	TSL:1 MANE Select	c.150G>T	p.Thr50Thr	synonymous	Exon 2 of 39	ENSP00000230538.7	Q16363-1
	LAMA4	ENST00000389463.9	TSL:1	c.150G>T	p.Thr50Thr	synonymous	Exon 2 of 39	ENSP00000374114.4	A0A0A0MTC7
	LAMA4	ENST00000522006.5	TSL:1	c.150G>T	p.Thr50Thr	synonymous	Exon 2 of 39	ENSP00000429488.1	A0A0A0MTC7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1434378 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 711076

African (AFR) AF: 0.00 AC: 0 AN: 32878

American (AMR) AF: 0.00 AC: 0 AN: 39644

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25548

East Asian (EAS) AF: 0.00 AC: 0 AN: 38270

South Asian (SAS) AF: 0.00 AC: 0 AN: 83296

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51668

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5734

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1097952

Other (OTH) AF: 0.00 AC: 0 AN: 59388

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.60
CADD	Benign	7.2
DANN	Benign	0.70
PhyloP100		-0.53
PromoterAI		-0.14	Neutral

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr6-112575203;