rs199649563

Positions:

chr2-73450731-A-G

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_StrongBS1_Supporting

The NM_001378454.1(ALMS1):c.4204A>G(p.Thr1402Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000105 in 1,612,388 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/17 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00016 ( 1 hom., cov: 32)

Exomes 𝑓: 0.000099 ( 1 hom. )

Consequence

ALMS1
NM_001378454.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:2

Conservation

PhyloP100: -2.05

Variant links:

Genes affected

ALMS1 (HGNC:428): (ALMS1 centrosome and basal body associated protein) This gene encodes a protein containing a large tandem-repeat domain as well as additional low complexity regions. The encoded protein functions in microtubule organization, particularly in the formation and maintanance of cilia. Mutations in this gene cause Alstrom syndrome. There is a pseudogene for this gene located adjacent in the same region of chromosome 2. Alternative splice variants have been described but their full length nature has not been determined. [provided by RefSeq, Apr 2014]

ALMS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.013007224).

BS1

Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.0000992 (145/1461454) while in subpopulation MID AF= 0.00243 (14/5766). AF 95% confidence interval is 0.00147. There are 1 homozygotes in gnomad4_exome. There are 83 alleles in male gnomad4_exome subpopulation. Median coverage is 42. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ALMS1	NM_001378454.1 linkuse as main transcript	c.4204A>G	p.Thr1402Ala	missense_variant	8/23	ENST00000613296.6
ALMS1	NM_015120.4 linkuse as main transcript	c.4207A>G	p.Thr1403Ala	missense_variant	8/23

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ALMS1	ENST00000613296.6 linkuse as main transcript	c.4204A>G	p.Thr1402Ala	missense_variant	8/23	1	NM_001378454.1	P3	Q8TCU4-1

Frequencies

GnomAD3 genomes

AF:

0.000166

AC:

AN:

150816

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000245

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000597

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000838

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00637

Gnomad NFE

AF:

0.000118

Gnomad OTH

AF:

0.000483

GnomAD3 exomes

AF:

0.000209

AC:

AN:

249340

Hom.:

AF XY:

0.000222

AC XY:

AN XY:

135272

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000377

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000654

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000168

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000992

AC:

145

AN:

1461454

Hom.:

Cov.:

AF XY:

0.000114

AC XY:

AN XY:

727052

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000313

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000626

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000477

Gnomad4 OTH exome

AF:

0.000166

GnomAD4 genome

AF:

0.000159

AC:

AN:

150934

Hom.:

Cov.:

AF XY:

0.000190

AC XY:

AN XY:

73700

show subpopulations

Gnomad4 AFR

AF:

0.0000244

Gnomad4 AMR

AF:

0.000596

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000839

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.000113

Hom.:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000122

AC:

ExAC

AF:

0.000199

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000327

EpiControl

AF:

0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Alstrom syndrome

Uncertain:2Benign:1

Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Jan 01, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	May 18, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Oct 17, 2022	This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 1403 of the ALMS1 protein (p.Thr1403Ala). This variant is present in population databases (rs199649563, gnomAD 0.06%). This variant has not been reported in the literature in individuals affected with ALMS1-related conditions. ClinVar contains an entry for this variant (Variation ID: 240995). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Not Available"; Align-GVGD: "Not Available". The alanine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 17, 2023

In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 06, 2023

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.50

BayesDel_noAF

Benign

-0.59

CADD

Benign

0.0010

DANN

Benign

0.38

DEOGEN2

Benign

0.027

T;.;.

Eigen

Benign

-1.6

Eigen_PC

Benign

-1.8

FATHMM_MKL

Benign

0.0061

LIST_S2

Benign

0.56

T;T;T

M_CAP

Benign

0.0035

MetaRNN

Benign

0.013

T;T;T

MetaSVM

Benign

-1.0

MutationTaster

Benign

1.0

N;N;N

PrimateAI

Benign

0.27

Sift4G

Benign

0.22

T;T;T

Vest4

0.044

MVP

0.085

ClinPred

0.017

GERP RS

-7.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.025

gMVP

0.033

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