10-27504291-T-A

Variant names:

• chr10-27504291-T-A
• rs886046964
• ENST00000621805.6:c.-79T>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000682082.1(RAB18):​n.-79T>A variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: RAB18 ENST00000682082.1 non_coding_transcript_exon
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0740
• Publications: 0 publications found

Genes affected

RAB18 (HGNC:14244): (RAB18, member RAS oncogene family) The protein encoded by this gene is a member of a family of Ras-related small GTPases that regulate membrane trafficking in organelles and transport vesicles. Knockdown studies is zebrafish suggest that this protein may have a role in eye and brain development. Mutations in this gene are associated with Warburg micro syndrome type 3. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jan 2012]

RAB18 Gene-Disease associations (from GenCC):

• Warburg micro syndrome 3

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• Warburg micro syndrome

  Inheritance: AR Classification: MODERATE, SUPPORTIVE Submitted by: ClinGen, Orphanet

LOC124902399 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.25).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RAB18	NM_021252.5	c.-79T>A		upstream_gene_variant		ENST00000356940.11	NP_067075.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RAB18	ENST00000356940.11	c.-79T>A		upstream_gene_variant		1	NM_021252.5	ENSP00000349415.7

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1266856 Hom.: 0 Cov.: 19 AF XY: 0.00 AC XY: 0 AN XY: 631162

African (AFR) AF: 0.00 AC: 0 AN: 29136

American (AMR) AF: 0.00 AC: 0 AN: 35542

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24366

East Asian (EAS) AF: 0.00 AC: 0 AN: 35342

South Asian (SAS) AF: 0.00 AC: 0 AN: 76780

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 41286

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3866

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 966692

Other (OTH) AF: 0.00 AC: 0 AN: 53846

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Warburg micro syndrome 3 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.25
CADD	Benign	16
DANN	Benign	0.89
PhyloP100		0.074
PromoterAI		-0.26	Neutral

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: rs886046964; hg19: chr10-27793220;