12-55992121-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002868.4(RAB5B):c.557C>T(p.Pro186Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000958 in 1,461,854 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000096 (0 hom.)
• Consequence: RAB5B NM_002868.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.42

Genes affected

RAB5B (HGNC:9784): (RAB5B, member RAS oncogene family) Enables GDP binding activity; GTP-dependent protein binding activity; and GTPase activity. Involved in antigen processing and presentation and plasma membrane to endosome transport. Located in endosome and extracellular exosome. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2326976).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RAB5B	NM_002868.4	c.557C>T	p.Pro186Leu	missense_variant	6/6	ENST00000360299.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RAB5B	ENST00000360299.10	c.557C>T	p.Pro186Leu	missense_variant	6/6	1	NM_002868.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000958 AC: 14 AN: 1461854 Hom.: 0 Cov.: 30 AF XY: 0.0000124 AC XY: 9 AN XY: 727230

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000126

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

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 13, 2022

The c.557C>T (p.P186L) alteration is located in exon 6 (coding exon 5) of the RAB5B gene. This alteration results from a C to T substitution at nucleotide position 557, causing the proline (P) at amino acid position 186 to be replaced by a leucine (L). 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	Benign	0.15
BayesDel_addAF	Uncertain	0.078	D
BayesDel_noAF	Benign	-0.13
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Benign	0.23	T;T;.
Eigen	Benign	0.022
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Pathogenic	1.0	D
M_CAP	Benign	0.040	D
MetaRNN	Benign	0.23	T;T;T
MetaSVM	Benign	-0.67	T
MutationAssessor	Benign	0.55	N;N;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-3.3	D;D;D
REVEL	Uncertain	0.35
Sift	Benign	0.032	D;D;D
Sift4G	Benign	0.17	T;T;T
Polyphen		0.019	B;B;.
Vest4		0.29
MutPred		0.22		Loss of disorder (P = 0.0736);Loss of disorder (P = 0.0736);.;
MVP		0.82
MPC		0.70
ClinPred		0.91	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.18
gMVP		0.65

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1890146196; hg19: chr12-56385905;