dbSNP rs777243508: LZTR1:p.Trp469* (chr22-20993977-G-A) – ACMG Classification: Pathogenic (16 pts)

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_006767.4(LZTR1):c.1407G>A(p.Trp469*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000688 in 1,612,468 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.00017 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000058 ( 0 hom. )

Consequence

LZTR1
NM_006767.4 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 7.76

Variant links:

Genes affected

LZTR1 (HGNC:6742): (leucine zipper like post translational regulator 1) This gene encodes a member of the BTB-kelch superfamily. Initially described as a putative transcriptional regulator based on weak homology to members of the basic leucine zipper-like family, the encoded protein subsequently has been shown to localize exclusively to the Golgi network where it may help stabilize the Gogli complex. Deletion of this gene may be associated with DiGeorge syndrome. [provided by RefSeq, Jul 2008]

LZTR1 links:

ENSG00000285314 (HGNC:):

ENSG00000285314 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP5

Variant 22-20993977-G-A is Pathogenic according to our data. Variant chr22-20993977-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 549753.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LZTR1	NM_006767.4 link	c.1407G>A	p.Trp469*	stop_gained	Exon 13 of 21	ENST00000646124.2	NP_006758.2	Q8N653A0A384NL67

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LZTR1	ENST00000646124.2 link	c.1407G>A	p.Trp469*	stop_gained	Exon 13 of 21		NM_006767.4	ENSP00000496779.1		Q8N653

Frequencies

GnomAD3 genomes

AF:

0.000171

AC:

AN:

152258

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00235

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000138

AC:

AN:

246400

Hom.:

AF XY:

0.000150

AC XY:

AN XY:

133646

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00149

Gnomad NFE exome

AF:

0.00000900

Gnomad OTH exome

AF:

0.000167

GnomAD4 exome

AF:

0.0000582

AC:

AN:

1460092

Hom.:

Cov.:

AF XY:

0.0000565

AC XY:

AN XY:

726298

show subpopulations

Gnomad4 AFR exome

AF:

0.00

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:

0.00156

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.000171

AC:

AN:

152376

Hom.:

Cov.:

AF XY:

0.000282

AC XY:

AN XY:

74518

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00235

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000699

Hom.:

ExAC

AF:

0.0000990

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:1

Apr 25, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Trp469*) in the LZTR1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in LZTR1 are known to be pathogenic (PMID: 24362817, 25335493, 25480913, 25795793, 29469822, 30368668, 30442762, 30442766, 30481304, 30859559). This variant is present in population databases (rs777243508, gnomAD 0.1%). This premature translational stop signal has been observed in individual(s) with milder Noonan syndrome-like features (PMID: 30859559). ClinVar contains an entry for this variant (Variation ID: 549753). For these reasons, this variant has been classified as Pathogenic. -

Hereditary cancer-predisposing syndrome;CN230736:Cardiovascular phenotype

Pathogenic:1

Mar 31, 2023

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.W469* pathogenic mutation (also known as c.1407G>A), located in coding exon 13 of the LZTR1 gene, results from a G to A substitution at nucleotide position 1407. This changes the amino acid from a tryptophan to a stop codon within coding exon 13. This variant has been reported in an individual with Noonan syndrome-like features including severe hypertrophic cardiomyopathy; it was confirmed in trans with an LZTR1 missense variant (c.2246A>G, p.Y749C) that was classified as a variant of unknown significance by authors (Pagnamenta AT et al. Clin Genet, 2019 Jun;95:693-703; Farncombe KM et al. BMC Med Genomics, 2022 Jul;15:160). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. Loss-of-function variants in LZTR1 are related to an increased risk for schwannomas and autosomal recessive Noonan syndrome; however, such associations with autosomal dominant Noonan syndrome have not been observed (Piotrowski A et al. Nat Genet. 2014 Feb;46:182-7; Yamamoto GL et al. J Med Genet. 2015 Jun;52:413-21; Johnston JJ et al. Genet Med. 2018 10;20:1175-1185). Based on the supporting evidence, this variant is pathogenic for an increased risk of LZTR1-related schwannomatosis (SWN) and would be expected to cause autosomal recessive Noonan syndrome when present along with a second pathogenic or likely pathogenic variant on the other allele; however, the association of this alteration with autosomal dominant Noonan syndrome is unlikely. -

Noonan syndrome 2

Pathogenic:1

Jul 02, 2018

Clinical and Biomedical Sciences, University of Exeter

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.57

BayesDel_noAF

Pathogenic

0.57

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Pathogenic

1.0

Eigen_PC

Pathogenic

0.92

FATHMM_MKL

Pathogenic

0.98

Vest4

0.23

GERP RS

5.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over