rs730880368

Positions:

• chr4-6302349-G-GCCCAGC

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PM4

The NM_006005.3(WFS1):​c.2555_2560dupCCCAGC​(p.Gln853_Leu854insProGln) variant causes a disruptive inframe insertion change. The variant allele was found at a frequency of 0.00000479 in 1,460,536 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: not found (cov: 35)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: WFS1 NM_006005.3 disruptive_inframe_insertion
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:3
• Conservation: PhyloP100: 5.62

Genes affected

WFS1 (HGNC:12762): (wolframin ER transmembrane glycoprotein) This gene encodes a transmembrane protein, which is located primarily in the endoplasmic reticulum and ubiquitously expressed with highest levels in brain, pancreas, heart, and insulinoma beta-cell lines. Mutations in this gene are associated with Wolfram syndrome, also called DIDMOAD (Diabetes Insipidus, Diabetes Mellitus, Optic Atrophy, and Deafness), an autosomal recessive disorder. The disease affects the brain and central nervous system. Mutations in this gene can also cause autosomal dominant deafness 6 (DFNA6), also known as DFNA14 or DFNA38. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Mar 2009]

WFS1 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a topological_domain Lumenal (size 216) in uniprot entity WFS1_HUMAN there are 92 pathogenic changes around while only 24 benign (79%) in NM_006005.3
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_006005.3.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
WFS1	NM_006005.3	c.2555_2560dupCCCAGC	p.Gln853_Leu854insProGln	disruptive_inframe_insertion	8/8	ENST00000226760.5	NP_005996.2
WFS1	NM_001145853.1	c.2555_2560dupCCCAGC	p.Gln853_Leu854insProGln	disruptive_inframe_insertion	8/8		NP_001139325.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
WFS1	ENST00000226760.5	c.2555_2560dupCCCAGC	p.Gln853_Leu854insProGln	disruptive_inframe_insertion	8/8	1	NM_006005.3	ENSP00000226760.1

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD3 exomes AF: 0.00000800 AC: 2 AN: 249876 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135508

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000177

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1460536 Hom.: 0 Cov.: 99 AF XY: 0.00000550 AC XY: 4 AN XY: 726644

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000630

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 35

Bravo AF: 0.00000378

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Wolfram syndrome 1 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

Clinical Genomics, Uppaluri K&H Personalized Medicine Clinic

-

Potent mutations in WFS1 gene are associated with Wolfram's syndrome, an autosomal recessive condition, which cause diabetes mellitus, diabetes insipidus, deafness and optic atrophy. However no sufficient evidence is found to ascertain the role of this particular variant rs730880368 in Wolfram's syndrome yet. -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jul 24, 2014

Variant classified as Uncertain Significance - Favor Benign. The 2555_2560dup va riant in WFS1 has not been previously reported in individuals with hearing loss in any other families or in large population studies. This variant results in an insertion of two amino acids proline (Pro) and glutamine (Gln) between glutamin e (Gln) and leucine (Leu) at positions 853 and 854, but does not disrupt the rea ding frame of the protein. Therefore, the impact of this variant on the normal f unction of the protein cannot be predicted. In summary, the clinical significanc e of the 2555_2560dup variant is uncertain. -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 03, 2021

The c.2555_2560dupCCCAGC (p.Q853_L854insPQ) alteration is located in exon 8 (coding exon 7) of the WFS1 gene. The alteration consists of an in-frame duplication of 6 nucleotides from position 2555 to 2560, resulting in the duplication of 2 residues. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 10, 2023

This variant, c.2555_2560dup, results in the insertion of 2 amino acid(s) of the WFS1 protein (p.Gln853_Leu854insProGln), but otherwise preserves the integrity of the reading frame. This variant is present in population databases (rs766668712, gnomAD 0.002%). This variant has not been reported in the literature in individuals affected with WFS1-related conditions. ClinVar contains an entry for this variant (Variation ID: 179778). 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. -

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: rs730880368; hg19: chr4-6304076;