2-73385903-TGGAGGAGGAGGAGGAGGAGGAGGA-T

Position:

• chr2-73385903-TGGAGGAGGAGGAGGAGGAGGAGGA-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP3

The NM_001378454.1(ALMS1):​c.51_74del​(p.Glu21_Glu28del) variant causes a inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000442 in 701,270 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000056 (0 hom., cov: 0)
  • Exomes 𝑓: 0.000041 (0 hom.)
• Consequence: ALMS1 NM_001378454.1 inframe_deletion
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.45

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP3: Nonframeshift variant in repetitive region in NM_001378454.1

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ALMS1	NM_001378454.1	c.51_74del	p.Glu21_Glu28del	inframe_deletion	1/23	ENST00000613296.6	NP_001365383.1
ALMS1	NM_015120.4	c.51_74del	p.Glu22_Glu29del	inframe_deletion	1/23		NP_055935.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ALMS1	ENST00000613296.6	c.51_74del	p.Glu21_Glu28del	inframe_deletion	1/23	1	NM_001378454.1	ENSP00000482968	P3

Frequencies

GnomAD3 genomes AF: 0.0000557 AC: 8 AN: 143532 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.0000251

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000136

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000234

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000622

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000412 AC: 23 AN: 557738 Hom.: 0 AF XY: 0.0000504 AC XY: 15 AN XY: 297828

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000357

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000385

Gnomad4 OTH exome AF: 0.0000332

GnomAD4 genome AF: 0.0000557 AC: 8 AN: 143532 Hom.: 0 Cov.: 0 AF XY: 0.0000431 AC XY: 3 AN XY: 69544

Gnomad4 AFR AF: 0.0000251

Gnomad4 AMR AF: 0.000136

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000234

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000622

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jun 26, 2024

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports a deleterious effect on protein structure/function; In-frame deletion in a repetitive region with no known function; Has not been previously published as pathogenic or benign to our knowledge -

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: rs55889738; hg19: chr2-73613031;