1-207321782-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000574.5(CD55):c.17C>A(p.Pro6Gln) 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 benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. P6P) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CD55 NM_000574.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.50

Genes affected

CD55 (HGNC:2665): (CD55 molecule (Cromer blood group)) This gene encodes a glycoprotein involved in the regulation of the complement cascade. Binding of the encoded protein to complement proteins accelerates their decay, thereby disrupting the cascade and preventing damage to host cells. Antigens present on this protein constitute the Cromer blood group system (CROM). Alternative splicing results in multiple transcript variants. The predominant transcript variant encodes a membrane-bound protein, but alternatively spliced transcripts may produce soluble proteins. [provided by RefSeq, Jul 2014]

LOC107985251 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16029543).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CD55	NM_000574.5	c.17C>A	p.Pro6Gln	missense_variant	1/10	ENST00000367064.9
LOC107985251	XR_007066838.1	n.348G>T		non_coding_transcript_exon_variant	1/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CD55	ENST00000367064.9	c.17C>A	p.Pro6Gln	missense_variant	1/10	1	NM_000574.5	P2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Mar 12, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0". The glutamine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant has not been reported in the literature in individuals affected with CD55-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with glutamine, which is neutral and polar, at codon 6 of the CD55 protein (p.Pro6Gln). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
Cadd	Benign	9.8
Dann	Uncertain	0.98
DEOGEN2	Benign	0.40	T;.;T;.;.;.;.
Eigen	Benign	-0.71
Eigen_PC	Benign	-0.94
FATHMM_MKL	Benign	0.13	N
LIST_S2	Benign	0.74	T;T;T;T;T;T;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.16	T;T;T;T;T;T;T
MetaSVM	Benign	-0.82	T
MutationAssessor	Benign	0.81	L;.;.;L;L;.;L
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-0.96	N;N;N;.;N;N;.
REVEL	Benign	0.087
Sift	Pathogenic	0.0	D;D;D;.;D;D;.
Sift4G	Benign	0.061	T;D;T;.;D;T;.
Polyphen		0.95	P;D;D;.;D;.;.
Vest4		0.15
MutPred		0.47		Loss of glycosylation at T2 (P = 0.0751);Loss of glycosylation at T2 (P = 0.0751);Loss of glycosylation at T2 (P = 0.0751);Loss of glycosylation at T2 (P = 0.0751);Loss of glycosylation at T2 (P = 0.0751);Loss of glycosylation at T2 (P = 0.0751);Loss of glycosylation at T2 (P = 0.0751);
MVP		0.34
MPC		0.54
ClinPred		0.62	D
GERP RS		-4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.3
Varity_R		0.11
gMVP		0.24

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: chr1-207495127;