X-37780083-G-T

Variant names:

• chrX-37780083-G-T
• rs372462475
• NM_000397.4:c.6G>T

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_000397.4(CYBB):​c.6G>T​(p.Gly2Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. G2G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 22)
• Consequence: CYBB NM_000397.4 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.625
• Publications: 0 publications found

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]

CYBB Gene-Disease associations (from GenCC):

• granulomatous disease, chronic, X-linked

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• chronic granulomatous disease

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• X-linked Mendelian susceptibility to mycobacterial diseases due to CYBB deficiency

  Inheritance: XL, Unknown Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

ENSG00000250349 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.6).
• BP6: Variant X-37780083-G-T is Benign according to our data. Variant chrX-37780083-G-T is described in ClinVar as Likely_benign. ClinVar VariationId is 3239486.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=0.625 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000397.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYBB	NM_000397.4	MANE Select	c.6G>T	p.Gly2Gly	synonymous	Exon 1 of 13	NP_000388.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYBB	ENST00000378588.5	TSL:1 MANE Select	c.6G>T	p.Gly2Gly	synonymous	Exon 1 of 13	ENSP00000367851.4	P04839
	ENSG00000250349	ENST00000465127.1	TSL:5	c.171+354083G>T		intron	N/A	ENSP00000417050.1	B4E171
	CYBB	ENST00000968558.1		c.6G>T	p.Gly2Gly	synonymous	Exon 1 of 14	ENSP00000638617.1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 22

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.60
CADD	Benign	13
DANN	Benign	0.80
PhyloP100		0.63
PromoterAI		-0.081	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs372462475; hg19: chrX-37639336;