X-37805077-G-A

Position:

• chrX-37805077-G-A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PS1_Moderate PM2 PP3_Strong PP5_Moderate

The NM_000397.4(CYBB):​c.1223G>A​(p.Gly408Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin UniProt.

• Frequency: Genomes: not found (cov: 23)
• Consequence: CYBB NM_000397.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1 O:1
• Conservation: PhyloP100: 9.60

Genes affected

CYBB (HGNC:2578): (cytochrome b-245 beta chain) Cytochrome b (-245) is composed of cytochrome b alpha (CYBA) and beta (CYBB) chain. It has been proposed as a primary component of the microbicidal oxidase system of phagocytes. CYBB deficiency is one of five described biochemical defects associated with chronic granulomatous disease (CGD). In this disorder, there is decreased activity of phagocyte NADPH oxidase; neutrophils are able to phagocytize bacteria but cannot kill them in the phagocytic vacuoles. The cause of the killing defect is an inability to increase the cell's respiration and consequent failure to deliver activated oxygen into the phagocytic vacuole. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PS1: Transcript NM_000397.4 (CYBB) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.995
• PP5: Variant X-37805077-G-A is Pathogenic according to our data. Variant chrX-37805077-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 68377.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-37805077-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CYBB	NM_000397.4	c.1223G>A	p.Gly408Glu	missense_variant	10/13	ENST00000378588.5	NP_000388.2
CYBB	XM_047441855.1	c.917G>A	p.Gly306Glu	missense_variant	9/12		XP_047297811.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CYBB	ENST00000378588.5	c.1223G>A	p.Gly408Glu	missense_variant	10/13	1	NM_000397.4	ENSP00000367851	P1
CYBB	ENST00000696171.1	c.1127G>A	p.Gly376Glu	missense_variant	9/12			ENSP00000512462
CYBB	ENST00000696170.1	c.*732G>A		3_prime_UTR_variant, NMD_transcript_variant	9/12			ENSP00000512461

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1 Other:1

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Feb 26, 2016	The G408E missense variant in the CYBB gene has been reported previously in association with X-linked Chronic Granulomatous Disease (CGD) (O'Neill et al., 2015; Rae et al., 1998). The G408E variant was not observed in approximately 6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. This non-conservative amino acid substitution occurs at a position in the NADPH-binding domain that is conserved across species and in silico analysis predicts this variant is probably damaging to the protein structure/function. Functional studies confirm that the G408 residue is essential for NADPH oxidase complex activity, and that the G408E variant specifically disturbs the normal electron transfer from NADPH to FAD leading to a defective NAD incorporation in the binding site. (Debeurme et al., 2010). Missense variants in the same (G408R) and nearby residues (M405R, G412R/E) have been reported in the Human Gene Mutation Database in association with X-linked CGD (Stenson et al., 2014). -
not provided, no classification provided	literature only	UniProtKB/Swiss-Prot	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.72	D
BayesDel_noAF	Pathogenic	0.79
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.99	D
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D
M_CAP	Pathogenic	0.89	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.0	H
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.93	D
PROVEAN	Pathogenic	-6.3	D
REVEL	Pathogenic	0.99
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.99
MutPred		0.97		Gain of loop (P = 0.2045);
MVP		1.0
MPC		1.8
ClinPred		1.0	D
GERP RS		5.9
Varity_R		1.0
gMVP		0.99

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: rs151344474; hg19: chrX-37664330; COSMIC: COSV66086124; COSMIC: COSV66086124;