chr22-36876028-G-A

Variant names:

• chr22-36876028-G-A
• rs200347935
• ENST00000397147.7:c.1003G>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The ENST00000248899.11(NCF4):​c.759-1G>A variant causes a splice acceptor, intron change. The variant allele was found at a frequency of 0.00000137 in 1,461,012 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: NCF4 ENST00000248899.11 splice_acceptor, intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.26
• Publications: 1 publications found

Genes affected

NCF4 (HGNC:7662): (neutrophil cytosolic factor 4) The protein encoded by this gene is a cytosolic regulatory component of the superoxide-producing phagocyte NADPH-oxidase, a multicomponent enzyme system important for host defense. This protein is preferentially expressed in cells of myeloid lineage. It interacts primarily with neutrophil cytosolic factor 2 (NCF2/p67-phox) to form a complex with neutrophil cytosolic factor 1 (NCF1/p47-phox), which further interacts with the small G protein RAC1 and translocates to the membrane upon cell stimulation. This complex then activates flavocytochrome b, the membrane-integrated catalytic core of the enzyme system. The PX domain of this protein can bind phospholipid products of the PI(3) kinase, which suggests its role in PI(3) kinase-mediated signaling events. The phosphorylation of this protein was found to negatively regulate the enzyme activity. Alternatively spliced transcript variants encoding distinct isoforms have been observed. [provided by RefSeq, Jul 2008]

NCF4 Gene-Disease associations (from GenCC):

• granulomatous disease, chronic, autosomal recessive, cytochrome b-positive, type 3

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• chronic granulomatous disease

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.064705886 fraction of the gene. Cryptic splice site detected, with MaxEntScore 4.9, offset of 1, new splice context is: cagcctgtcacccccttaAGgac. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000248899.11. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NCF4	NM_000631.5	MANE Select	c.759-1G>A		splice_acceptor intron	N/A	NP_000622.2
	NCF4	NM_013416.4		c.1003G>A	p.Gly335Arg	missense	Exon 8 of 9	NP_038202.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NCF4	ENST00000397147.7	TSL:1	c.1003G>A	p.Gly335Arg	missense	Exon 8 of 9	ENSP00000380334.4
	NCF4	ENST00000248899.11	TSL:1 MANE Select	c.759-1G>A		splice_acceptor intron	N/A	ENSP00000248899.6
	NCF4	ENST00000415063.2	TSL:5	n.593G>A		non_coding_transcript_exon	Exon 3 of 4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461012 Hom.: 0 Cov.: 36 AF XY: 0.00 AC XY: 0 AN XY: 726626

African (AFR) AF: 0.00 AC: 0 AN: 33464

American (AMR) AF: 0.00 AC: 0 AN: 44708

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26078

East Asian (EAS) AF: 0.00 AC: 0 AN: 39680

South Asian (SAS) AF: 0.00 AC: 0 AN: 86238

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53406

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111326

Other (OTH) AF: 0.00 AC: 0 AN: 60348

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Benign	-0.32
CADD	Pathogenic	28
DANN	Uncertain	0.99
Eigen	Uncertain	0.24
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Uncertain	0.95	D
M_CAP	Uncertain	0.12	D
PhyloP100		6.3
ClinPred		0.98	D
GERP RS		5.0
Mutation Taster		=3/97	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.86		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.45		Position offset: 2
DS_AL_spliceai		0.86		Position offset: 1

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

Other links and lift over

dbSNP: rs200347935; hg19: chr22-37272070;