2-80302548-C-G

Variant names:

• chr2-80302548-C-G
• rs752164655
• NM_178839.5:c.1272G>C

Variant summary

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

The NM_178839.5(LRRTM1):​c.1272G>C​(p.Gln424His) 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. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: LRRTM1 NM_178839.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.23

Genes affected

LRRTM1 (HGNC:19408): (leucine rich repeat transmembrane neuronal 1) Predicted to be involved in regulation of postsynaptic density assembly and regulation of presynapse assembly. Predicted to act upstream of or within several processes, including long-term synaptic potentiation; negative regulation of receptor internalization; and positive regulation of synapse assembly. Located in endoplasmic reticulum and growth cone. Is active in GABA-ergic synapse. Is integral component of postsynaptic specialization membrane. [provided by Alliance of Genome Resources, Apr 2022]

CTNNA2 (HGNC:2510): (catenin alpha 2) Enables actin filament binding activity. Involved in negative regulation of Arp2/3 complex-mediated actin nucleation; regulation of neuron migration; and regulation of neuron projection development. Located in cytoplasm. Implicated in complex cortical dysplasia with other brain malformations. [provided by Alliance of Genome Resources, Apr 2022]

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=0.22216329).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LRRTM1	NM_178839.5	c.1272G>C	p.Gln424His	missense_variant	Exon 2 of 2	ENST00000295057.4	NP_849161.2
CTNNA2	NM_001282597.3	c.1057-90663C>G		intron_variant	Intron 7 of 18	ENST00000402739.9	NP_001269526.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LRRTM1	ENST00000295057.4	c.1272G>C	p.Gln424His	missense_variant	Exon 2 of 2	1	NM_178839.5	ENSP00000295057.3
CTNNA2	ENST00000402739.9	c.1057-90663C>G		intron_variant	Intron 7 of 18	1	NM_001282597.3	ENSP00000384638.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000403 AC: 1 AN: 248054 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 134510

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Sep 20, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1272G>C (p.Q424H) alteration is located in exon 2 (coding exon 1) of the LRRTM1 gene. This alteration results from a G to C substitution at nucleotide position 1272, causing the glutamine (Q) at amino acid position 424 to be replaced by a histidine (H). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Benign	-0.085	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Benign	0.051	T;T
Eigen	Benign	-0.061
Eigen_PC	Benign	-0.0088
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.81	.;T
M_CAP	Benign	0.020	T
MetaRNN	Benign	0.22	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.69	N;N
PrimateAI	Uncertain	0.77	T
PROVEAN	Benign	-0.74	N;N
REVEL	Benign	0.27
Sift	Benign	0.053	T;T
Sift4G	Benign	0.10	T;T
Polyphen		0.98	D;D
Vest4		0.25
MutPred		0.41		Gain of helix (P = 0.0425);Gain of helix (P = 0.0425);
MVP		0.31
ClinPred		0.25	T
GERP RS		3.4
Varity_R		0.12
gMVP		0.80

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: rs752164655; hg19: chr2-80529673; COSMIC: COSV99703226; COSMIC: COSV99703226;