19-18568537-G-T

Position:

• chr19-18568537-G-T

Variant summary

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

The NM_024069.4(KXD1):​c.437G>T​(p.Ser146Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: KXD1 NM_024069.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.04

Genes affected

KXD1 (HGNC:28420): (KxDL motif containing 1) Involved in lysosome localization. Part of BORC complex. [provided by Alliance of Genome Resources, Apr 2022]

UBA52 (HGNC:12458): (ubiquitin A-52 residue ribosomal protein fusion product 1) Ubiquitin is a highly conserved nuclear and cytoplasmic protein that has a major role in targeting cellular proteins for degradation by the 26S proteosome. It is also involved in the maintenance of chromatin structure, the regulation of gene expression, and the stress response. Ubiquitin is synthesized as a precursor protein consisting of either polyubiquitin chains or a single ubiquitin moiety fused to an unrelated protein. This gene encodes a fusion protein consisting of ubiquitin at the N terminus and ribosomal protein L40 at the C terminus, a C-terminal extension protein (CEP). Multiple processed pseudogenes derived from this gene are present in the genome. [provided by RefSeq, Jul 2008]

KXD1-AS1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KXD1	NM_024069.4	c.437G>T	p.Ser146Ile	missense_variant	5/5	ENST00000222307.9	NP_076974.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KXD1	ENST00000222307.9	c.437G>T	p.Ser146Ile	missense_variant	5/5	1	NM_024069.4	ENSP00000222307.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

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 19, 2022

The c.437G>T (p.S146I) alteration is located in exon 6 (coding exon 4) of the KXD1 gene. This alteration results from a G to T substitution at nucleotide position 437, causing the serine (S) at amino acid position 146 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	Benign	0.21
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.046	T;T;T;.;T;T;.;T
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.79	.;T;.;T;.;.;T;.
M_CAP	Uncertain	0.18	D
MetaRNN	Uncertain	0.63	D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.42	T
MutationAssessor	Uncertain	2.0	M;M;M;.;M;M;.;M
PrimateAI	Uncertain	0.55	T
PROVEAN	Benign	-2.2	N;N;N;.;.;.;.;.
REVEL	Benign	0.29
Sift	Uncertain	0.0020	D;D;D;.;.;.;.;.
Sift4G	Uncertain	0.011	D;D;D;D;D;D;D;D
Polyphen		1.0	D;D;D;.;D;D;.;D
Vest4		0.67
MutPred		0.14		Loss of phosphorylation at S146 (P = 0.0172);Loss of phosphorylation at S146 (P = 0.0172);Loss of phosphorylation at S146 (P = 0.0172);.;Loss of phosphorylation at S146 (P = 0.0172);Loss of phosphorylation at S146 (P = 0.0172);Loss of phosphorylation at S146 (P = 0.0172);Loss of phosphorylation at S146 (P = 0.0172);
MVP		0.80
MPC		1.6
ClinPred		0.91	D
GERP RS		4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.48
gMVP		0.66

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: chr19-18679347;