X-120526797-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_001079872.2(CUL4B):c.2652T>G(p.Asp884Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000184 in 1,084,035 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D884N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000018 (0 hom. 1 hem.)
• Consequence: CUL4B NM_001079872.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.58

Genes affected

CUL4B (HGNC:2555): (cullin 4B) This gene is a member of the cullin family. The encoded protein forms a complex that functions as an E3 ubiquitin ligase and catalyzes the polyubiquitination of specific protein substrates in the cell. The protein interacts with a ring finger protein, and is required for the proteolysis of several regulators of DNA replication including chromatin licensing and DNA replication factor 1 and cyclin E. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, CUL4B
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.762

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CUL4B	NM_001079872.2	c.2652T>G	p.Asp884Glu	missense_variant	20/20	ENST00000371322.11
CUL4B	NM_003588.4	c.2706T>G	p.Asp902Glu	missense_variant	22/22
CUL4B	NM_001330624.2	c.2667T>G	p.Asp889Glu	missense_variant	21/21
CUL4B	NM_001369145.1	c.2118T>G	p.Asp706Glu	missense_variant	20/20

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CUL4B	ENST00000371322.11	c.2652T>G	p.Asp884Glu	missense_variant	20/20	1	NM_001079872.2

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD3 exomes AF: 0.0000109 AC: 2 AN: 183050 Hom.: 0 AF XY: 0.0000148 AC XY: 1 AN XY: 67578

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000729

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000184 AC: 2 AN: 1084035 Hom.: 0 Cov.: 26 AF XY: 0.00000285 AC XY: 1 AN XY: 351197

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000573

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

X-linked intellectual disability Cabezas type Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Breda Genetics srl

Feb 03, 2021

Based on allele frequency, in-silico prediction scores and a certain overlap with the clinical phenotype, we interpreted this variant at least as of uncertain significance. The lack of one or more of the following features has discouraged further investigations: lack of a possible second hit in autosomal recessive conditions, presence of healthy controls in databases for autosomal dominant conditions, presence of unmatching cardinal clinical features in the patient or in the known gene-disease association, and/or variant type outside the known gene mutational spectrum. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.81
BayesDel_addAF	Uncertain	0.064	T
BayesDel_noAF	Uncertain	0.040
Cadd	Benign	23
Dann	Uncertain	0.99
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Pathogenic	0.98	D;D;D
M_CAP	Uncertain	0.088	D
MetaRNN	Pathogenic	0.76	D;D;D
MetaSVM	Uncertain	-0.24	T
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Uncertain	-3.5	D;D;D
REVEL	Uncertain	0.56
Sift	Uncertain	0.019	D;D;D
Sift4G	Uncertain	0.055	T;T;T
Polyphen		1.0	D;.;D
Vest4		0.68
MutPred		0.63		.;.;Gain of glycosylation at P906 (P = 0.1344);
MVP		0.95
MPC		1.7
ClinPred		0.53	D
GERP RS		0.56
Varity_R		0.75
gMVP		0.87

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: rs768424127; hg19: chrX-119660652;