rs1555640521

chr18-6942109-GA-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PM4 PP5_Moderate

The NM_005559.4(LAMA1):c.9197del(p.Phe3066SerfsTer33) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: LAMA1 NM_005559.4 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.56

Genes affected

LAMA1 (HGNC:6481): (laminin subunit alpha 1) This gene encodes one of the alpha 1 subunits of laminin. The laminins are a family of extracellular matrix glycoproteins that have a heterotrimeric structure consisting of an alpha, beta and gamma chain. These proteins make up a major component of the basement membrane and have been implicated in a wide variety of biological processes including cell adhesion, differentiation, migration, signaling, neurite outgrowth and metastasis. Mutations in this gene may be associated with Poretti-Boltshauser syndrome. [provided by RefSeq, Sep 2014]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Frameshift in the end of transcript resulting in stoplost. Downstream stopcodon found after 3085 codons.
• PP5: Variant 18-6942109-GA-G is Pathogenic according to our data. Variant chr18-6942109-GA-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 522847.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LAMA1	NM_005559.4	c.9197del	p.Phe3066SerfsTer33	frameshift_variant	63/63	ENST00000389658.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LAMA1	ENST00000389658.4	c.9197del	p.Phe3066SerfsTer33	frameshift_variant	63/63	1	NM_005559.4	P1
LAMA1	ENST00000488064.5	n.2604del		non_coding_transcript_exon_variant	14/14	2
LAMA1	ENST00000492048.5	n.2085del		non_coding_transcript_exon_variant	7/7	2
LAMA1	ENST00000579014.5	n.10212del		non_coding_transcript_exon_variant	62/62	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Ataxia - intellectual disability - oculomotor apraxia - cerebellar cysts syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Undiagnosed Diseases Network, NIH

Mar 12, 2018

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Computational scores

Source: dbNSFP v4.3

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

LitVar

Other links and lift over

dbSNP: rs1555640521; hg19: chr18-6942108;