Genetic Variant LSS:p.Ala19Thr (chr21-46228559-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_002340.6(LSS):c.55G>A(p.Ala19Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000564 in 1,595,164 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000042 ( 0 hom. )

Consequence

LSS
NM_002340.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.54

Variant links:

Genes affected

LSS (HGNC:6708): (lanosterol synthase) The protein encoded by this gene catalyzes the conversion of (S)-2,3 oxidosqualene to lanosterol. The encoded protein is a member of the terpene cyclase/mutase family and catalyzes the first step in the biosynthesis of cholesterol, steroid hormones, and vitamin D. Alternative splicing results in multiple transcript variants encoding different isoforms.[provided by RefSeq, Feb 2009]

LSS links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.22240019).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
LSS	NM_002340.6 link	c.55G>A	p.Ala19Thr	missense_variant	Exon 2 of 22	ENST00000397728.8	NP_002331.3
LSS	NM_001001438.3 link	c.55G>A	p.Ala19Thr	missense_variant	Exon 2 of 23		NP_001001438.1
LSS	NM_001145436.2 link	c.55G>A	p.Ala19Thr	missense_variant	Exon 2 of 22		NP_001138908.1
LSS	NM_001145437.2 link	c.-186G>A		5_prime_UTR_variant	Exon 1 of 21		NP_001138909.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LSS	ENST00000397728.8 link	c.55G>A	p.Ala19Thr	missense_variant	Exon 2 of 22	1	NM_002340.6	ENSP00000380837.2		P48449-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152138

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000141

AC:

AN:

212170

Hom.:

AF XY:

0.00000843

AC XY:

AN XY:

118666

show subpopulations

Gnomad AFR exome

AF:

0.000161

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000876

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000416

AC:

AN:

1443026

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

718000

show subpopulations

Gnomad4 AFR exome

AF:

0.000120

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000252

Gnomad4 NFE exome

AF:

9.01e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152138

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Aug 20, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.55G>A (p.A19T) alteration is located in exon 2 (coding exon 2) of the LSS gene. This alteration results from a G to A substitution at nucleotide position 55, causing the alanine (A) at amino acid position 19 to be replaced by a threonine (T). 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

0.11

BayesDel_addAF

Uncertain

0.020

BayesDel_noAF

Benign

-0.21

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.070

T;T;.;.

Eigen

Benign

0.0048

Eigen_PC

Benign

0.013

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.92

.;D;D;D

M_CAP

Benign

0.023

MetaRNN

Benign

0.22

T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

2.0

M;M;M;.

PrimateAI

Uncertain

0.71

PROVEAN

Benign

-1.3

N;N;N;N

REVEL

Benign

0.18

Sift

Benign

0.59

T;T;T;T

Sift4G

Benign

0.51

T;T;T;T

Polyphen

0.95

P;P;.;.

Vest4

0.64

MutPred

0.22

Gain of glycosylation at A19 (P = 0.0213);Gain of glycosylation at A19 (P = 0.0213);Gain of glycosylation at A19 (P = 0.0213);.;

MVP

0.46

MPC

0.69

ClinPred

0.69

GERP RS

4.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.40

gMVP

0.40

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

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