19-40784036-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_016154.5(RAB4B):c.391G>A(p.Val131Ile) variant causes a missense change involving the alteration of a 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: RAB4B NM_016154.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.98

Genes affected

RAB4B (HGNC:9782): (RAB4B, member RAS oncogene family) Predicted to enable G protein activity and GTP binding activity. Involved in glucose import. Located in insulin-responsive compartment; perinuclear region of cytoplasm; and recycling endosome. [provided by Alliance of Genome Resources, Apr 2022]

MIA-RAB4B (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.756

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RAB4B	NM_016154.5	c.391G>A	p.Val131Ile	missense_variant	5/8	ENST00000357052.8
MIA-RAB4B	NR_037775.1	n.753G>A		non_coding_transcript_exon_variant	7/10
RAB4B-EGLN2	NR_037791.1	n.548G>A		non_coding_transcript_exon_variant	5/12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RAB4B	ENST00000357052.8	c.391G>A	p.Val131Ile	missense_variant	5/8	1	NM_016154.5	P1
	ENST00000595728.2	n.992-4145C>T		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 27, 2022

The c.391G>A (p.V131I) alteration is located in exon 5 (coding exon 5) of the RAB4B gene. This alteration results from a G to A substitution at nucleotide position 391, causing the valine (V) at amino acid position 131 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
Cadd	Pathogenic	27
Dann	Uncertain	1.0
DEOGEN2	Benign	0.27	T;T
Eigen	Pathogenic	0.69
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Uncertain	0.094	D
MetaRNN	Pathogenic	0.76	D;D
MetaSVM	Uncertain	0.19	D
MutationAssessor	Benign	1.5	L;L
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.71	T
Sift4G	Uncertain	0.026	D;D
Polyphen		0.97	D;D
Vest4		0.72
MutPred		0.62		Loss of disorder (P = 0.1994);Loss of disorder (P = 0.1994);
MVP		0.63
MPC		0.78
ClinPred		0.98	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.60
gMVP		0.54

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-41289941;