chr4-109740962-T-G

Position:

• chr4-109740962-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000204.5(CFI):​c.1683A>C​(p.Lys561Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CFI NM_000204.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.69

Genes affected

CFI (HGNC:5394): (complement factor I) This gene encodes a serine proteinase that is essential for regulating the complement cascade. The encoded preproprotein is cleaved to produce both heavy and light chains, which are linked by disulfide bonds to form a heterodimeric glycoprotein. This heterodimer can cleave and inactivate the complement components C4b and C3b, and it prevents the assembly of the C3 and C5 convertase enzymes. Defects in this gene cause complement factor I deficiency, an autosomal recessive disease associated with a susceptibility to pyogenic infections. Mutations in this gene have been associated with a predisposition to atypical hemolytic uremic syndrome, a disease characterized by acute renal failure, microangiopathic hemolytic anemia and thrombocytopenia. Primary glomerulonephritis with immune deposits and age-related macular degeneration are other conditions associated with mutations of this gene. [provided by RefSeq, Dec 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CFI	NM_000204.5	c.1683A>C	p.Lys561Asn	missense_variant	13/13	ENST00000394634.7	NP_000195.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CFI	ENST00000394634.7	c.1683A>C	p.Lys561Asn	missense_variant	13/13	1	NM_000204.5	ENSP00000378130	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Atypical hemolytic-uremic syndrome with I factor anomaly Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Neuberg Centre For Genomic Medicine, NCGM

-

The missense c.1683A>C(p.Lys561Asn) variant in CFI gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The p.Lys561Asn variant is novel (not in any individuals) in gnomAD Exomes and 1000 Genomes. This variant has not been reported to the ClinVar database. The amino acid change p.Lys561Asn in CFI is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. The amino acid Lys at position 561 is changed to a Asn changing protein sequence and it might alter its composition and physico-chemical properties. For these reasons, this variant has been classified as Variant of Uncertain Significance (VUS). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.81
BayesDel_addAF	Uncertain	0.078	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.57	D;D;.
Eigen	Benign	0.17
Eigen_PC	Benign	0.18
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.91	D;D;D
M_CAP	Uncertain	0.17	D
MetaRNN	Uncertain	0.58	D;D;D
MetaSVM	Uncertain	0.34	D
MutationAssessor	Benign	0.30	N;.;.
MutationTaster	Benign	0.96	D;D;D
PrimateAI	Benign	0.43	T
PROVEAN	Uncertain	-4.0	D;D;D
REVEL	Uncertain	0.64
Sift	Uncertain	0.0040	D;D;D
Sift4G	Uncertain	0.0070	D;D;D
Polyphen		0.99	D;D;P
Vest4		0.50
MutPred		0.68		.;Loss of methylation at K569 (P = 0.0044);.;
MVP		0.89
MPC		0.38
ClinPred		0.97	D
GERP RS		2.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.75
gMVP		0.79

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr4-110662118;