chr15-65077584-G-A

Position:

• chr15-65077584-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001101362.3(KBTBD13):​c.769G>A​(p.Asp257Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000283 in 1,411,014 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: 33)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: KBTBD13 NM_001101362.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.58

Genes affected

KBTBD13 (HGNC:37227): (kelch repeat and BTB domain containing 13) The gene belongs to a family of genes encoding proteins containing a BTB domain and several kelch repeats. The BTB domain functions as a protein-protein interaction module, which includes an ability to self-associate or to interact with non-BTB domain-containing proteins. The kelch motif typically occurs in groups of five to seven repeats, and has been found in proteins with diverse functions. Known functions of these family members include transcription regulation, ion channel tetramerization and gating, protein ubiquitination or degradation, and cytoskeleton regulation. The exact function of this family member has yet to be determined. [provided by RefSeq, Jun 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.36224094).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KBTBD13	NM_001101362.3	c.769G>A	p.Asp257Asn	missense_variant	1/1	ENST00000432196.5	NP_001094832.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KBTBD13	ENST00000432196.5	c.769G>A	p.Asp257Asn	missense_variant	1/1		NM_001101362.3	ENSP00000388723	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000283 AC: 4 AN: 1411014 Hom.: 0 Cov.: 42 AF XY: 0.00000286 AC XY: 2 AN XY: 699244

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: 0.00000366

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Nemaline myopathy 6 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 22, 2023

ClinVar contains an entry for this variant (Variation ID: 464361). This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 257 of the KBTBD13 protein (p.Asp257Asn). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with KBTBD13-related conditions. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt KBTBD13 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Benign	0.29	T
Eigen	Benign	-0.16
Eigen_PC	Benign	0.060
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.81	T
M_CAP	Pathogenic	0.49	D
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	0.47	N
MutationTaster	Benign	1.0	N
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.30
Sift	Benign	0.40	T
Sift4G	Benign	0.37	T
Polyphen		0.096	B
Vest4		0.24
MutPred		0.60		Gain of methylation at R259 (P = 0.0769);
MVP		0.58
MPC		0.53
ClinPred		0.42	T
GERP RS		5.3
Varity_R		0.24
gMVP		0.25

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: rs568675071; hg19: chr15-65369922; COSMIC: COSV71351360; COSMIC: COSV71351360;