chrX-56564841-C-T

Variant names:

• chrX-56564841-C-T
• rs1555977386
• NM_013444.4:c.968C>T

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4 BS2

The NM_013444.4(UBQLN2):​c.968C>T​(p.Pro323Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00001 in 1,097,963 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 2 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. P323P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.000010 (0 hom. 2 hem.)
• Consequence: UBQLN2 NM_013444.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.69

Genes affected

UBQLN2 (HGNC:12509): (ubiquilin 2) This gene encodes an ubiquitin-like protein (ubiquilin) that shares high degree of similarity with related products in yeast, rat and frog. Ubiquilins contain a N-terminal ubiquitin-like domain and a C-terminal ubiquitin-associated domain. They physically associate with both proteasomes and ubiquitin ligases; and thus, are thought to functionally link the ubiquitination machinery to the proteasome to affect in vivo protein degradation. This ubiquilin has also been shown to bind the ATPase domain of the Hsp70-like Stch protein. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.27138764).
• BS2: High Hemizygotes in GnomAdExome4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UBQLN2	NM_013444.4	c.968C>T	p.Pro323Leu	missense_variant	Exon 1 of 1	ENST00000338222.7	NP_038472.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UBQLN2	ENST00000338222.7	c.968C>T	p.Pro323Leu	missense_variant	Exon 1 of 1	6	NM_013444.4	ENSP00000345195.5

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 0.0000100 AC: 11 AN: 1097963 Hom.: 0 Cov.: 32 AF XY: 0.00000550 AC XY: 2 AN XY: 363317

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: 0.0000119

Gnomad4 OTH exome AF: 0.0000217

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Amyotrophic lateral sclerosis type 15 Uncertain:1

Dec 16, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is not present in population databases (ExAC no frequency). This sequence change replaces proline with leucine at codon 323 of the UBQLN2 protein (p.Pro323Leu). The proline residue is moderately conserved and there is a moderate physicochemical difference between proline and leucine. This variant has not been reported in the literature in individuals with UBQLN2-related disease. 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. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The leucine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	0.00023	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.064	T
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Benign	0.82	T
M_CAP	Pathogenic	0.45	D
MetaRNN	Benign	0.27	T
MetaSVM	Benign	-0.60	T
MutationAssessor	Uncertain	2.2	M
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.34
Sift	Benign	0.033	D
Sift4G	Uncertain	0.060	T
Polyphen		0.90	P
Vest4		0.18
MutPred		0.16		Loss of glycosylation at P323 (P = 0.0059);
MVP		0.72
MPC		0.49
ClinPred		0.70	D
GERP RS		4.0
Varity_R		0.12
gMVP		0.72

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: rs1555977386; hg19: chrX-56591274;