10-27509891-A-C

Variant names:

• chr10-27509891-A-C
• rs2138970903
• NM_021252.5:c.85A>C

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_021252.5(RAB18):​c.85A>C​(p.Thr29Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: RAB18 NM_021252.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.58
• 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

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.88

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RAB18	NM_021252.5	c.85A>C	p.Thr29Pro	missense_variant	Exon 2 of 7	ENST00000356940.11	NP_067075.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RAB18	ENST00000356940.11	c.85A>C	p.Thr29Pro	missense_variant	Exon 2 of 7	1	NM_021252.5	ENSP00000349415.7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jan 28, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Uncertain	0.095	D
BayesDel_noAF	Benign	-0.10
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.70	.;.;D;T;.
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.48	T;D;D;D;T
M_CAP	Uncertain	0.25	D
MetaRNN	Pathogenic	0.88	D;D;D;D;D
MetaSVM	Uncertain	0.64	D
MutationAssessor	Uncertain	2.7	M;.;M;.;M
PhyloP100		5.6
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-3.9	D;.;D;D;.
REVEL	Pathogenic	0.75
Sift	Uncertain	0.0070	D;.;D;D;.
Sift4G	Uncertain	0.0060	D;D;D;D;D
Polyphen		1.0	.;.;D;.;.
Vest4		0.71
MutPred		0.70		Loss of stability (P = 0.0817);Loss of stability (P = 0.0817);Loss of stability (P = 0.0817);Loss of stability (P = 0.0817);Loss of stability (P = 0.0817);
MVP		0.73
MPC		1.5
ClinPred		0.97	D
GERP RS		4.5
Varity_R		0.96
gMVP		0.96
Mutation Taster		=36/64	disease causing

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: rs2138970903; hg19: chr10-27798820;