rs117905900

Variant names:

• chr6-31948042-C-G
• rs117905900
• NM_001710.6:c.858C>G

Your query was ambiguous. Multiple possible variants found:

• chr6-31948042-C-G
• chr6-31948042-C-T

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PS1_Very_Strong PM2 PP3_Strong PP5_Moderate

The NM_001710.6(CFB):​c.858C>G​(p.Phe286Leu) variant causes a missense change involving the alteration of a non-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 Likely pathogenic (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in ClinVar. Synonymous variant affecting the same amino acid position (i.e. F286F) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CFB NM_001710.6 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1 O:1
• Conservation: PhyloP100: 0.962
• Publications: 22 publications found

Genes affected

CFB (HGNC:1037): (complement factor B) This gene encodes complement factor B, a component of the alternative pathway of complement activation. Factor B circulates in the blood as a single chain polypeptide. Upon activation of the alternative pathway, it is cleaved by complement factor D yielding the noncatalytic chain Ba and the catalytic subunit Bb. The active subunit Bb is a serine protease which associates with C3b to form the alternative pathway C3 convertase. Bb is involved in the proliferation of preactivated B lymphocytes, while Ba inhibits their proliferation. This gene localizes to the major histocompatibility complex (MHC) class III region on chromosome 6. This cluster includes several genes involved in regulation of the immune reaction. Polymorphisms in this gene are associated with a reduced risk of age-related macular degeneration. The polyadenylation site of this gene is 421 bp from the 5' end of the gene for complement component 2. [provided by RefSeq, Jul 2008]

CFB Gene-Disease associations (from GenCC):

• atypical hemolytic-uremic syndrome with B factor anomaly

  Inheritance: Unknown, AD Classification: STRONG, MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen
• complement factor b deficiency

  Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics

ENSG00000244255 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 16 ACMG points.

• PS1: Transcript NM_001710.6 (CFB) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar.
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.969
• PP5: Variant 6-31948042-C-G is Pathogenic according to our data. Variant chr6-31948042-C-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 16079.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001710.6. 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
	CFB	NM_001710.6	MANE Select	c.858C>G	p.Phe286Leu	missense	Exon 6 of 18	NP_001701.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CFB	ENST00000425368.7	TSL:1 MANE Select	c.858C>G	p.Phe286Leu	missense	Exon 6 of 18	ENSP00000416561.2
	ENSG00000244255	ENST00000456570.5	TSL:2	c.2364C>G	p.Phe788Leu	missense	Exon 18 of 30	ENSP00000410815.1
	ENSG00000244255	ENST00000477310.1	TSL:5	c.1911C>G	p.Phe637Leu	missense	Exon 16 of 28	ENSP00000418996.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Atypical hemolytic-uremic syndrome (1)
-	-	-	Atypical hemolytic-uremic syndrome with B factor anomaly (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.42
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.64	D
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.80	T
M_CAP	Uncertain	0.28	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Uncertain	0.45	D
MutationAssessor	Pathogenic	2.9	M
PhyloP100		0.96
PrimateAI	Uncertain	0.66	T
PROVEAN	Uncertain	-4.2	D
REVEL	Pathogenic	0.84
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.70
MutPred		0.90		Loss of ubiquitination at K792 (P = 0.0896)
MVP		0.70
MPC		1.5
ClinPred		1.0	D
GERP RS		3.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.94
gMVP		0.90
Mutation Taster		=18/82	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		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: rs117905900; hg19: chr6-31915819;