rs769236666

Variant names:

• chr9-127454591-A-T
• rs769236666
• NM_001005373.4:c.64A>T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001384144.1(LRSAM1):​c.-721A>T variant causes a 5 prime UTR premature start codon gain 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: LRSAM1 NM_001384144.1 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.16

Genes affected

LRSAM1 (HGNC:25135): (leucine rich repeat and sterile alpha motif containing 1) This gene encodes a ring finger protein involved in a variety of functions, including regulation of signaling pathways and cell adhesion, mediation of self-ubiquitylation, and involvement in cargo sorting during receptor endocytosis. Mutations in this gene have been associated with Charcot-Marie-Tooth disease. Multiple transcript variants encoding different isoforms have been identified for this gene. [provided by RefSeq, Jan 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2758694).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LRSAM1	NM_001005373.4	c.64A>T	p.Met22Leu	missense_variant	Exon 3 of 26	ENST00000300417.11	NP_001005373.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LRSAM1	ENST00000300417.11	c.64A>T	p.Met22Leu	missense_variant	Exon 3 of 26	1	NM_001005373.4	ENSP00000300417.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000797 AC: 2 AN: 250970 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135710

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

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 Data not reliable, filtered out with message: AS_VQSR AF: 0.00000137 AC: 2 AN: 1461588 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727102

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease axonal type 2P Uncertain:1

Jun 11, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with LRSAM1-related disease. This variant is present in population databases (rs769236666, ExAC 0.01%). This sequence change replaces methionine with leucine at codon 22 of the LRSAM1 protein (p.Met22Leu). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and leucine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	21
DANN	Benign	0.94
DEOGEN2	Benign	0.043	T;.;T;T
Eigen	Benign	0.055
Eigen_PC	Benign	0.18
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.79	T;T;.;.
M_CAP	Benign	0.0047	T
MetaRNN	Benign	0.28	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.090	N;N;N;N
PrimateAI	Pathogenic	0.80	T
PROVEAN	Benign	-0.42	N;N;N;N
REVEL	Benign	0.19
Sift	Benign	0.72	T;T;T;T
Sift4G	Benign	0.51	T;T;T;T
Polyphen		0.73	P;P;P;P
Vest4		0.39
MutPred		0.48		Loss of catalytic residue at M22 (P = 0.0057);Loss of catalytic residue at M22 (P = 0.0057);Loss of catalytic residue at M22 (P = 0.0057);Loss of catalytic residue at M22 (P = 0.0057);
MVP		0.43
MPC		0.16
ClinPred		0.30	T
GERP RS		5.3
Varity_R		0.29
gMVP		0.32

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs769236666; hg19: chr9-130216870;