Genetic Variant RAB23:p.Ala73Glu (chr6-57207651-G-T) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_016277.5(RAB23):c.218C>A(p.Ala73Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000069 in 1,449,816 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A73V) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

RAB23
NM_016277.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 9.96

Publications

0 publications found

Variant links:

Genes affected

RAB23 (HGNC:14263): (RAB23, member RAS oncogene family) This gene encodes a small GTPase of the Ras superfamily. Rab proteins are involved in the regulation of diverse cellular functions associated with intracellular membrane trafficking, including autophagy and immune response to bacterial infection. The encoded protein may play a role in central nervous system development by antagonizing sonic hedgehog signaling. Disruption of this gene has been implicated in Carpenter syndrome as well as cancer. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

RAB23 Gene-Disease associations (from GenCC):

RAB23-related Carpenter syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen
Carpenter syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

RAB23 links:

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ACMG classification

Classification was made for transcript

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, 0.937

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_016277.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
RAB23	NM_016277.5	MANE Select	c.218C>A	p.Ala73Glu	missense	Exon 3 of 7	NP_057361.3
RAB23	NM_001278666.2		c.218C>A	p.Ala73Glu	missense	Exon 3 of 7	NP_001265595.1	Q9ULC3
RAB23	NM_001278667.2		c.218C>A	p.Ala73Glu	missense	Exon 3 of 7	NP_001265596.1	Q9ULC3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
RAB23	ENST00000468148.6	TSL:1 MANE Select	c.218C>A	p.Ala73Glu	missense	Exon 3 of 7	ENSP00000417610.1	Q9ULC3
RAB23	ENST00000317483.4	TSL:1	c.218C>A	p.Ala73Glu	missense	Exon 3 of 7	ENSP00000320413.3	Q9ULC3
RAB23	ENST00000875526.1		c.218C>A	p.Ala73Glu	missense	Exon 3 of 7	ENSP00000545585.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.90e-7

AC:

AN:

1449816

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

721978

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33188

American (AMR)

AF:

0.00

AC:

AN:

44678

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26046

East Asian (EAS)

AF:

0.00

AC:

AN:

39580

South Asian (SAS)

AF:

0.00

AC:

AN:

85960

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53350

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5746

European-Non Finnish (NFE)

AF:

9.08e-7

AC:

AN:

1101258

Other (OTH)

AF:

0.00

AC:

AN:

60010

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.275

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.37

BayesDel_noAF

Pathogenic

0.29

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.46

Eigen

Pathogenic

0.78

Eigen_PC

Pathogenic

0.82

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.90

M_CAP

Benign

0.049

MetaRNN

Pathogenic

0.94

MetaSVM

Uncertain

-0.086

MutationAssessor

Benign

1.5

PhyloP100

PrimateAI

Pathogenic

0.86

PROVEAN

Uncertain

-3.7

REVEL

Pathogenic

0.84

Sift

Uncertain

0.0030

Sift4G

Uncertain

0.011

Polyphen

0.92

Vest4

0.95

MutPred

0.82

Gain of disorder (P = 0.0322)

MVP

0.93

MPC

0.76

ClinPred

0.97

GERP RS

5.7

Varity_R

0.87

gMVP

0.82

Mutation Taster

=50/50

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over