rs777389303

Positions:

chr1-235812973-G-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2

The NM_000081.4(LYST):c.281C>T(p.Thr94Ile) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00014 in 1,598,090 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 18/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T94A) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00014 ( 2 hom. )

Consequence

LYST
NM_000081.4 missense, splice_region

Scores

Splicing: ADA: 0.01489

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:3

Conservation

PhyloP100: 3.01

Variant links:

Genes affected

LYST (HGNC:1968): (lysosomal trafficking regulator) This gene encodes a protein that regulates intracellular protein trafficking in endosomes, and may be involved in pigmentation. Mutations in this gene are associated with Chediak-Higashi syndrome, a lysosomal storage disorder. Alternative splicing results in multiple transcript variants, though the full-length nature of some of these variants has not been determined. [provided by RefSeq, Apr 2013]

LYST links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -12 ACMG points.

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), LYST. . Trascript score misZ 4.0845 (greater than threshold 3.09). GenCC has associacion of gene with Chediak-Higashi syndrome, attenuated Chédiak-Higashi syndrome.

BP4

Computational evidence support a benign effect (MetaRNN=0.007193178).

BP6

Variant 1-235812973-G-A is Benign according to our data. Variant chr1-235812973-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 211408.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=3}.

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000105 (16/152264) while in subpopulation EAS AF= 0.00309 (16/5184). AF 95% confidence interval is 0.00194. There are 0 homozygotes in gnomad4. There are 9 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LYST	NM_000081.4 linkuse as main transcript	c.281C>T	p.Thr94Ile	missense_variant, splice_region_variant	4/53	ENST00000389793.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LYST	ENST00000389793.7 linkuse as main transcript	c.281C>T	p.Thr94Ile	missense_variant, splice_region_variant	4/53	5	NM_000081.4	P1	Q99698-1

Frequencies

GnomAD3 genomes

AF:

0.000105

AC:

AN:

152144

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:

0.00308

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000240

AC:

AN:

250382

Hom.:

AF XY:

0.000237

AC XY:

AN XY:

135292

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000580

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00317

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

AF:

0.000144

AC:

208

AN:

1445826

Hom.:

Cov.:

AF XY:

0.000137

AC XY:

AN XY:

720258

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000448

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00428

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.11e-7

Gnomad4 OTH exome

AF:

0.000601

GnomAD4 genome

AF:

0.000105

AC:

AN:

152264

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74442

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00309

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000127

Hom.:

Bravo

AF:

0.000117

ExAC

AF:

0.000231

AC:

Asia WGS

AF:

0.00289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Chédiak-Higashi syndrome

Uncertain:2Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago	Mar 30, 2021	LYST NM_000081.3 exon 4 p.Thr94Ile (c.281C>T):This variant has been reported in the literature in at least 1 individual with T-cell deficiency as a compound heterozygote (StrayPedersen 2016 PMID:27577878, Yu 2016 PMID:2748032). Of note, the variant that was found in trans in this individual (p.Arg2261His) has been reported in ClinVar as Benign by multiple laboratories (https://www.ncbi.nlm.nih.gov/clinvar/variation/254933/). This variant is present in 0.3% (67/19846) of East Asian alleles including 1 homozygote in the Genome Aggregation Database (https://gnomad.broadinstitute.org/variant/1-235976273-G-A?dataset=gnomad_r2_1). This variant is present in ClinVar (Variation ID:211408). This variant amino acid Isoleucine (Ile) is present in >15 species including mammals, and is not well conserved among evolutionarily distant species; this suggests that this variant may not impact the protein. Additional computational prediction tools do not suggest an impact. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2024	- -

not specified

Uncertain:1Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Feb 04, 2015	- -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jun 23, 2023	Variant summary: LYST c.281C>T (p.Thr94Ile) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0014 in 327814 control chromosomes, predominantly at a frequency of 0.0053 within the Japanese subpopulation, including 2 homozygotes (gnomAD and jMorp databases; Tadaka_2021). The observed variant frequency within Japanese control individuals in the jMorp database is approximately 5 fold of the estimated maximal expected allele frequency for a pathogenic variant in LYST causing Chediak-Higashi Syndrome phenotype (0.0011), strongly suggesting that the variant is a benign polymorphism found primarily in populations of East Asian/Japanese origin. c.281C>T has been reported in the literature in at least one individual affected with T-cell deficiency, CD4 lymphopenia, and interstitial lung disease (e.g., Yu_2016, Stray-Pedersen_2017), however without strong evidence for causality (e.g., absence of a second pathogenic LYST variant). These reports therefore do not provide unequivocal conclusions about association of the variant with Chediak-Higashi Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 27577878, 27484032, 33179747). Five submitters have reported clinical-significance assessments for this variant to ClinVar after 2014. Multiple submitters reported the variant with conflicting assessments (VUS, n = 3; likely benign, n = 2). Based on the evidence outlined above, the variant was classified as likely benign. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Aug 26, 2019

See Variant Classification Assertion Criteria. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.086

BayesDel_addAF

Benign

-0.56

BayesDel_noAF

Benign

-0.58

CADD

Benign

DANN

Benign

0.65

DEOGEN2

Benign

0.097

T;.

Eigen

Benign

-0.66

Eigen_PC

Benign

-0.54

FATHMM_MKL

Uncertain

0.84

LIST_S2

Benign

0.73

T;T

M_CAP

Benign

0.021

MetaRNN

Benign

0.0072

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.84

L;.

MutationTaster

Benign

1.0

N;N;N

PrimateAI

Benign

0.28

PROVEAN

Benign

-1.9

N;N

REVEL

Benign

0.13

Sift

Benign

0.21

T;T

Sift4G

Benign

0.48

T;T

Polyphen

0.0

B;.

Vest4

0.19

MutPred

0.26

Loss of relative solvent accessibility (P = 0.0071);Loss of relative solvent accessibility (P = 0.0071);

MVP

0.25

MPC

0.083

ClinPred

0.042

GERP RS

2.2

Varity_R

0.033

gMVP

0.12

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.015

dbscSNV1_RF

Benign

0.22

SpliceAI score (max)

0.13

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