16-88646773-C-T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2 PM5 PP3_Strong PP5_Moderate

The NM_000101.4(CYBA):c.269G>A(p.Arg90Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000041 in 1,461,700 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R90G) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: CYBA NM_000101.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 6.49

Genes affected

CYBA (HGNC:2577): (cytochrome b-245 alpha chain) Cytochrome b is comprised of a light chain (alpha) and a heavy chain (beta). This gene encodes the light, alpha subunit which has been proposed as a primary component of the microbicidal oxidase system of phagocytes. Mutations in this gene are associated with autosomal recessive chronic granulomatous disease (CGD), that is characterized by the failure of activated phagocytes to generate superoxide, which is important for the microbicidal activity of these cells. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr16-88646774-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1522930.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.992
• PP5: Variant 16-88646773-C-T is Pathogenic according to our data. Variant chr16-88646773-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 2258.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr16-88646773-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CYBA	NM_000101.4	c.269G>A	p.Arg90Gln	missense_variant	4/6	ENST00000261623.8
CYBA	XM_011522905.4	c.269G>A	p.Arg90Gln	missense_variant	4/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CYBA	ENST00000261623.8	c.269G>A	p.Arg90Gln	missense_variant	4/6	1	NM_000101.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251050 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135826

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461700 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727174

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.0000188

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Granulomatous disease, chronic, autosomal recessive, cytochrome b-negative Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Aug 17, 2023	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 90 of the CYBA protein (p.Arg90Gln). This variant is present in population databases (rs104894513, gnomAD 0.003%). This missense change has been observed in individual(s) with chronic granulomatous disease (PMID: 2243141, 29560547, 30470980). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. This variant is also known as G-297>A (Arg-90>Gln). ClinVar contains an entry for this variant (Variation ID: 2258). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. This variant disrupts the p.Arg90 amino acid residue in CYBA. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 10910929, 20167518). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Nov 01, 1992	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.39
Cadd	Pathogenic	28
Dann	Pathogenic	1.0
DEOGEN2	Pathogenic	0.95	D;D;.;D
Eigen	Uncertain	0.68
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.95	D;D;D;D
M_CAP	Pathogenic	0.71	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Uncertain	2.7	M;.;.;.
MutationTaster	Benign	1.0	A;A;A
PrimateAI	Benign	0.44	T
PROVEAN	Uncertain	-3.0	D;D;D;D
REVEL	Pathogenic	0.88
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;.
Polyphen		1.0	D;.;.;.
Vest4		0.90
MutPred		0.98		Loss of methylation at R90 (P = 0.0202);Loss of methylation at R90 (P = 0.0202);Loss of methylation at R90 (P = 0.0202);Loss of methylation at R90 (P = 0.0202);
MVP		0.94
MPC		0.62
ClinPred		0.99	D
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.71
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs104894513; hg19: chr16-88713181;