chr2-73385937-GGAGGAA-G

Position:

• chr2-73385937-GGAGGAA-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP3 BP6

The NM_001378454.1(ALMS1):​c.75_80delAGAGGA​(p.Glu26_Glu27del) variant causes a disruptive inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000999 in 1,000,582 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.000023 (0 hom., cov: 28)
  • Exomes 𝑓: 0.0000081 (0 hom.)
• Consequence: ALMS1 NM_001378454.1 disruptive_inframe_deletion
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: 0.524

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP3: Nonframeshift variant in repetitive region in NM_001378454.1
• BP6: Variant 2-73385937-GGAGGAA-G is Benign according to our data. Variant chr2-73385937-GGAGGAA-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 402364.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1, Benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ALMS1	NM_001378454.1	c.75_80delAGAGGA	p.Glu26_Glu27del	disruptive_inframe_deletion	1/23	ENST00000613296.6	NP_001365383.1
ALMS1	NM_015120.4	c.75_80delAGAGGA	p.Glu26_Glu27del	disruptive_inframe_deletion	1/23		NP_055935.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ALMS1	ENST00000613296.6	c.75_80delAGAGGA	p.Glu26_Glu27del	disruptive_inframe_deletion	1/23	1	NM_001378454.1	ENSP00000482968.1

Frequencies

GnomAD3 genomes AF: 0.0000229 AC: 3 AN: 131260 Hom.: 0 Cov.: 28

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000731

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: 0.0000322

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000805 AC: 7 AN: 869322 Hom.: 0 AF XY: 0.00000901 AC XY: 4 AN XY: 444024

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000325

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000813

Gnomad4 OTH exome AF: 0.0000249

GnomAD4 genome AF: 0.0000229 AC: 3 AN: 131260 Hom.: 0 Cov.: 28 AF XY: 0.0000469 AC XY: 3 AN XY: 64008

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000731

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000322

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Mar 30, 2020	Variant summary: ALMS1 c.75_80delAGAGGA (p.Glu27_Glu28del) results in an in-frame deletion that is predicted to remove two amino acids from the encoded protein. The variant was absent in 127964 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.75_80delAGAGGA in individuals affected with Cardiomyopathy and no experimental evidence demonstrating its impact on protein function have been reported. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. One laboratory classified the variant as benign. Based on the evidence outlined above, the variant was classified as uncertain significance. -
Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 29, 2016	Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: Frequency -

Alstrom syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 22, 2023

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs754175473; hg19: chr2-73613065;