Genetic Variant ALMS1:p.Arg3180Gly (chr2-73491497-C-G) – ACMG Classification: Benign (-11 pts)

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 2P and 13B. PM5BP4_StrongBP6BS1BS2

The NM_001378454.1(ALMS1):c.9538C>G(p.Arg3180Gly) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000109 in 1,613,768 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/18 in silico tools predict a benign outcome for this variant. 1/1 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. R3180Q) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000099 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00011 ( 3 hom. )

Consequence

ALMS1
NM_001378454.1 missense, splice_region

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:5

Conservation

PhyloP100: 0.0170

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

Alstrom syndrome
Inheritance: Unknown, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), PanelApp Australia, Genomics England PanelApp, G2P, Orphanet

ALMS1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -11 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr2-73491498-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 553784.

BP4

Computational evidence support a benign effect (MetaRNN=0.0071887076).

BP6

Variant 2-73491497-C-G is Benign according to our data. Variant chr2-73491497-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 550314.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.0000985 (15/152222) while in subpopulation SAS AF = 0.0027 (13/4814). AF 95% confidence interval is 0.0016. There are 0 homozygotes in GnomAd4. There are 12 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 3 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001378454.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALMS1	NM_001378454.1	MANE Select	c.9538C>G	p.Arg3180Gly	missense splice_region	Exon 10 of 23	NP_001365383.1	Q8TCU4-1
	ALMS1	NM_015120.4		c.9538C>G	p.Arg3180Gly	missense splice_region	Exon 10 of 23	NP_055935.4	Q8TCU4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
ALMS1	ENST00000613296.6	TSL:1 MANE Select	c.9538C>G	p.Arg3180Gly	missense splice_region	Exon 10 of 23	ENSP00000482968.1	Q8TCU4-1
ALMS1	ENST00000484298.5	TSL:1	c.9412C>G	p.Arg3138Gly	missense splice_region	Exon 9 of 22	ENSP00000478155.1	A0A087WTU9
ALMS1	ENST00000423048.5	TSL:1	n.3030+1339C>G		intron	N/A	ENSP00000399833.1	H7C1D9

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152104

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:

0.00270

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000248

AC:

AN:

245626

AF XY:

0.000336

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000273

Gnomad OTH exome

AF:

0.000167

GnomAD4 exome

AF:

0.000110

AC:

161

AN:

1461546

Hom.:

Cov.:

AF XY:

0.000147

AC XY:

107

AN XY:

727046

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.00168

AC:

145

AN:

86220

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53232

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000360

AC:

AN:

1111910

Other (OTH)

AF:

0.000199

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.434

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000985

AC:

AN:

152222

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

AN XY:

74404

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41562

American (AMR)

AF:

0.00

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00270

AC:

AN:

4814

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10594

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68010

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.000281

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Alstrom syndrome (3)

not provided (3)

Cardiovascular phenotype (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.45

CADD

Benign

(source)

DANN

Benign

0.91

DEOGEN2

Benign

0.065

Eigen

Benign

-0.33

Eigen_PC

Benign

-0.18

FATHMM_MKL

Benign

0.39

LIST_S2

Benign

0.59

M_CAP

Benign

0.0012

MetaRNN

Benign

0.0072

MetaSVM

Benign

-0.96

PhyloP100

0.017

PrimateAI

Benign

0.28

Sift4G

Benign

0.44

Vest4

0.12

MVP

0.29

ClinPred

0.030

GERP RS

3.4

Varity_R

0.12

gMVP

0.12

Mutation Taster

=96/4

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over