chr2-73448426-A-G

Variant names:

• chr2-73448426-A-G
• rs116033693
• NM_001378454.1:c.1899A>G

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_001378454.1(ALMS1):​c.1899A>G​(p.Gln633Gln) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00225 in 1,614,008 control chromosomes in the GnomAD database, including 81 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.012 (40 hom., cov: 32)
  • Exomes 𝑓: 0.0012 (41 hom.)
• Consequence: ALMS1 NM_001378454.1 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:8
• Conservation: PhyloP100: -2.10
• Publications: 0 publications found

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

ENSG00000295621 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BP6: Variant 2-73448426-A-G is Benign according to our data. Variant chr2-73448426-A-G is described in ClinVar as Benign. ClinVar VariationId is 390645.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-2.1 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.012 (1829/152260) while in subpopulation AFR AF = 0.0418 (1736/41548). AF 95% confidence interval is 0.0401. There are 40 homozygotes in GnomAd4. There are 832 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 40 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.1899A>G	p.Gln633Gln	synonymous	Exon 8 of 23	NP_001365383.1	Q8TCU4-1
	ALMS1	NM_015120.4		c.1899A>G	p.Gln633Gln	synonymous	Exon 8 of 23	NP_055935.4	Q8TCU4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALMS1	ENST00000613296.6	TSL:1 MANE Select	c.1899A>G	p.Gln633Gln	synonymous	Exon 8 of 23	ENSP00000482968.1	Q8TCU4-1
	ALMS1	ENST00000484298.5	TSL:1	c.1773A>G	p.Gln591Gln	synonymous	Exon 7 of 22	ENSP00000478155.1	A0A087WTU9
	ALMS1	ENST00000684548.1		c.1518A>G	p.Gln506Gln	synonymous	Exon 6 of 21	ENSP00000507421.1	A0A804HJA5

Frequencies

GnomAD3 genomes AF: 0.0119 AC: 1817 AN: 152142 Hom.: 38 Cov.: 32

Gnomad AFR AF: 0.0416

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00426

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00104

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00813

GnomAD2 exomes AF: 0.00302 AC: 753 AN: 249056 AF XY: 0.00197

Gnomad AFR exome AF: 0.0436

Gnomad AMR exome AF: 0.00165

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000133

Gnomad OTH exome AF: 0.000661

GnomAD4 exome AF: 0.00123 AC: 1799 AN: 1461748 Hom.: 41 Cov.: 58 AF XY: 0.00107 AC XY: 778 AN XY: 727188

African (AFR) AF: 0.0438 AC: 1465 AN: 33466

American (AMR) AF: 0.00190 AC: 85 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39698

South Asian (SAS) AF: 0.000162 AC: 14 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53410

Middle Eastern (MID) AF: 0.00260 AC: 15 AN: 5768

European-Non Finnish (NFE) AF: 0.0000477 AC: 53 AN: 1111922

Other (OTH) AF: 0.00275 AC: 166 AN: 60386

GnomAD4 genome AF: 0.0120 AC: 1829 AN: 152260 Hom.: 40 Cov.: 32 AF XY: 0.0112 AC XY: 832 AN XY: 74436

African (AFR) AF: 0.0418 AC: 1736 AN: 41548

American (AMR) AF: 0.00425 AC: 65 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5178

South Asian (SAS) AF: 0.00104 AC: 5 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10618

Middle Eastern (MID) AF: 0.00340 AC: 1 AN: 294

European-Non Finnish (NFE) AF: 0.0000735 AC: 5 AN: 68010

Other (OTH) AF: 0.00804 AC: 17 AN: 2114

Alfa AF: 0.00594 Hom.: 18

Bravo AF: 0.0139

Asia WGS AF: 0.00375 AC: 13 AN: 3478

EpiCase AF: 0.000218

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions

Significance: Benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	3	Alstrom syndrome (3)
-	-	2	not provided (2)
-	-	2	not specified (2)
-	-	1	Cardiovascular phenotype (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	0.087
DANN	Benign	0.22
PhyloP100		-2.1
Mutation Taster		=100/0	polymorphism

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

Other links and lift over

dbSNP: rs116033693; hg19: chr2-73675553;