13-41131656-T-C

Position:

• chr13-41131656-T-C

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 2P and 8B. PM2 BP4_Strong BS2

The NM_152903.5(KBTBD6):​c.856A>G​(p.Ile286Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,461,694 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: KBTBD6 NM_152903.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.418

Genes affected

KBTBD6 (HGNC:25340): (kelch repeat and BTB domain containing 6) Involved in proteasome-mediated ubiquitin-dependent protein catabolic process; protein K48-linked ubiquitination; and regulation of Rac protein signal transduction. Located in cytoplasm and nucleus. Part of Cul3-RING ubiquitin ligase complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.04657817).
• BS2: High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KBTBD6	NM_152903.5	c.856A>G	p.Ile286Val	missense_variant	1/1	ENST00000379485.2	NP_690867.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KBTBD6	ENST00000379485.2	c.856A>G	p.Ile286Val	missense_variant	1/1		NM_152903.5	ENSP00000368799	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461694 Hom.: 0 Cov.: 36 AF XY: 0.00000275 AC XY: 2 AN XY: 727122

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: 0.00000450

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

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

May 26, 2023

The c.856A>G (p.I286V) alteration is located in exon 1 (coding exon 1) of the KBTBD6 gene. This alteration results from a A to G substitution at nucleotide position 856, causing the isoleucine (I) at amino acid position 286 to be replaced by a valine (V). 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	0.060
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
CADD	Benign	5.7
DANN	Benign	0.52
DEOGEN2	Benign	0.024	T
Eigen	Benign	-0.99
Eigen_PC	Benign	-0.91
FATHMM_MKL	Benign	0.30	N
LIST_S2	Benign	0.55	T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.047	T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	1.7	L
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.23	T
PROVEAN	Benign	-0.60	N
REVEL	Benign	0.11
Sift	Benign	0.29	T
Sift4G	Benign	0.36	T
Polyphen		0.0	B
Vest4		0.031
MutPred		0.41		Gain of ubiquitination at K284 (P = 0.1181);
MVP		0.20
MPC		0.81
ClinPred		0.053	T
GERP RS		-0.63
Varity_R		0.037
gMVP		0.28

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

LitVar

Other links and lift over

dbSNP: rs752560024; hg19: chr13-41705792;