chr19-859743-C-T

Variant names:

• chr19-859743-C-T
• rs1363632175
• NM_001928.4:c.54C>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001928.4(CFD):​c.54C>T​(p.Cys18Cys) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000353 in 1,416,752 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: CFD NM_001928.4 splice_region, synonymous
• Scores: Splicing: ADA: 0.0008983
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.24
• Publications: 0 publications found

Genes affected

CFD (HGNC:2771): (complement factor D) This gene encodes a member of the S1, or chymotrypsin, family of serine peptidases. This protease catalyzes the cleavage of factor B, the rate-limiting step of the alternative pathway of complement activation. This protein also functions as an adipokine, a cell signaling protein secreted by adipocytes, which regulates insulin secretion in mice. Mutations in this gene underlie complement factor D deficiency, which is associated with recurrent bacterial meningitis infections in human patients. Alternative splicing of this gene results in multiple transcript variants. At least one of these variants encodes a preproprotein that is proteolytically processed to generate the mature protease. [provided by RefSeq, Nov 2015]

CFD Gene-Disease associations (from GenCC):

• recurrent Neisseria infections due to factor D deficiency

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP7: Synonymous conserved (PhyloP=-1.24 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CFD	NM_001928.4	c.54C>T	p.Cys18Cys	splice_region_variant, synonymous_variant	Exon 1 of 5	ENST00000327726.11	NP_001919.2
CFD	NM_001317335.2	c.54C>T	p.Cys18Cys	synonymous_variant	Exon 1 of 5		NP_001304264.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CFD	ENST00000327726.11	c.54C>T	p.Cys18Cys	splice_region_variant, synonymous_variant	Exon 1 of 5	1	NM_001928.4	ENSP00000332139.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000353 AC: 5 AN: 1416752 Hom.: 0 Cov.: 31 AF XY: 0.00000285 AC XY: 2 AN XY: 700786

African (AFR) AF: 0.00 AC: 0 AN: 32650

American (AMR) AF: 0.00 AC: 0 AN: 38060

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25354

East Asian (EAS) AF: 0.00 AC: 0 AN: 37674

South Asian (SAS) AF: 0.00 AC: 0 AN: 80742

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49358

Middle Eastern (MID) AF: 0.000180 AC: 1 AN: 5560

European-Non Finnish (NFE) AF: 0.00000367 AC: 4 AN: 1088748

Other (OTH) AF: 0.00 AC: 0 AN: 58606

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	1.8
DANN	Benign	0.84
PhyloP100		-1.2
PromoterAI		-0.12	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00090
dbscSNV1_RF	Benign	0.046
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: rs1363632175; hg19: chr19-859743;