chrX-65524113-G-A

Variant names:

• chrX-65524113-G-A
• rs1057518699
• NM_031206.7:c.1243C>T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3 PP5_Moderate

The NM_031206.7(LAS1L):​c.1243C>T​(p.Arg415Trp) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: LAS1L NM_031206.7 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 4.38

Genes affected

LAS1L (HGNC:25726): (LAS1 like ribosome biogenesis factor) Enables RNA binding activity. Predicted to be involved in maturation of 5.8S rRNA and maturation of LSU-rRNA. Located in membrane. Part of MLL1 complex. Implicated in Wilson-Turner syndrome. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.809
• PP5: Variant X-65524113-G-A is Pathogenic according to our data. Variant chrX-65524113-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 374326.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-65524113-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LAS1L	NM_031206.7	c.1243C>T	p.Arg415Trp	missense_variant	Exon 10 of 14	ENST00000374811.8	NP_112483.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LAS1L	ENST00000374811.8	c.1243C>T	p.Arg415Trp	missense_variant	Exon 10 of 14	1	NM_031206.7	ENSP00000363944.3

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 23

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

Wilson-Turner syndrome Pathogenic:2

Aug 20, 2021

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Jan 20, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 415 of the LAS1L protein (p.Arg415Trp). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with Wilson-Turner Syndrome (PMID: 25644381). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 374326). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt LAS1L protein function. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Global developmental delay Pathogenic:1

May 14, 2015

Baylor Genetics

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant was reported by our lab in an individual with global developmental delay, autistic features, history of congenital hypothyroidism, postaxial polydactyly, intellectual disability, hypotonia, dysmorphic features, joint contractures, and hyperphagia. This variant has been reported to cause intellectual disability in multiple affected male members within the same family [PMID 25644381]. A second pathogenic variant, in GLI3 (NM_000168.5, c.2252delA), was also reported in this individual. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.42	.;T;.
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.95	D;D;D
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.81	D;D;D
MetaSVM	Benign	-0.38	T
MutationAssessor	Uncertain	2.9	.;M;.
PrimateAI	Uncertain	0.59	T
PROVEAN	Pathogenic	-4.5	D;D;D
REVEL	Uncertain	0.37
Sift	Uncertain	0.0020	D;D;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	D;D;D
Vest4		0.67
MutPred		0.63		.;Gain of helix (P = 0.0325);.;
MVP		0.69
MPC		1.6
ClinPred		1.0	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.41
gMVP		0.89

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: rs1057518699; hg19: chrX-64743993; COSMIC: COSV56707416; COSMIC: COSV56707416;