rs886044716

chr4-139472880-T-A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP3_Strong PP5

The NM_031296.3(RAB33B):c.444T>A(p.Asn148Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. 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 Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: RAB33B NM_031296.3 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 0.100

Genes affected

RAB33B (HGNC:16075): (RAB33B, member RAS oncogene family) This gene encodes a small GTP-binding protein of the Rab GTPase family, whose members function in vesicle transport during protein secretion and endocytosis. Rab GTPases are active, membrane-associated proteins that recruit effector proteins in the GTP-bound state and inactive cytosolic proteins when in a GDP-bound state. The protein encoded by this gene is ubiquitously expressed and has been implicated in Golgi to endoplasmic reticulum cycling of Golgi enzymes. In addition, this protein regulates Golgi homeostasis and coordinates intra-Golgi retrograde trafficking. Allelic variants in this gene have been associated with Dyggve-Melchior-Clausen syndrome and Smith-McCort dysplasia 2, which are autosomal recessive spondyloepimetaphyseal dysplasias characterized by skeletal abnormalities. [provided by RefSeq, Sep 2016]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a chain Ras-related protein Rab-33B (size 228) in uniprot entity RB33B_HUMAN there are 5 pathogenic changes around while only 2 benign (71%) in NM_031296.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.987
• PP5: Variant 4-139472880-T-A is Pathogenic according to our data. Variant chr4-139472880-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 50231.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RAB33B	NM_031296.3	c.444T>A	p.Asn148Lys	missense_variant	2/2	ENST00000305626.6
RAB33B	XM_011532299.2	c.588T>A	p.Asn196Lys	missense_variant	3/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RAB33B	ENST00000305626.6	c.444T>A	p.Asn148Lys	missense_variant	2/2	1	NM_031296.3	P1
RAB33B	ENST00000652268.1	c.588T>A	p.Asn196Lys	missense_variant	3/3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Smith-McCort dysplasia 2 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Feb 01, 2013

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
Cadd	Uncertain	23
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.84	D
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.96	D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.72	D
MutationAssessor	Pathogenic	4.5	H
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.81	D
PROVEAN	Pathogenic	-5.2	D
REVEL	Pathogenic	0.81
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.98
MutPred		0.93		Loss of stability (P = 0.009);
MVP		0.93
MPC		1.5
ClinPred		1.0	D
GERP RS		0.73
Varity_R		0.99
gMVP		0.91

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs886044716; hg19: chr4-140394034;