rs34299096

Variant names:

• chr1-207330842-C-T
• rs34299096
• NM_000574.5:c.665-266C>T

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_Strong BS1

The NM_001300902.2(CD55):​c.665-266C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000676 in 152,270 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.00068 (0 hom., cov: 32)
• Consequence: CD55 NM_001300902.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.825
• Publications: 0 publications found

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]

CD55 Gene-Disease associations (from GenCC):

• protein-losing enteropathy

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Benign. The variant received -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BS1: Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.000676 (103/152270) while in subpopulation AMR AF = 0.00137 (21/15290). AF 95% confidence interval is 0.00092. There are 0 homozygotes in GnomAd4. There are 46 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001300902.2. 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
	CD55	NM_000574.5	MANE Select	c.665-266C>T		intron	N/A	NP_000565.1
	CD55	NM_001300902.2		c.665-266C>T		intron	N/A	NP_001287831.1
	CD55	NM_001114752.3		c.665-266C>T		intron	N/A	NP_001108224.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CD55	ENST00000367064.9	TSL:1 MANE Select	c.665-266C>T		intron	N/A	ENSP00000356031.4
	CD55	ENST00000367063.6	TSL:1	c.665-266C>T		intron	N/A	ENSP00000356030.2
	CD55	ENST00000314754.12	TSL:1	c.665-266C>T		intron	N/A	ENSP00000316333.8

Frequencies

GnomAD3 genomes AF: 0.000677 AC: 103 AN: 152152 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000169

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00138

Gnomad ASJ AF: 0.000576

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000472

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000941

Gnomad OTH AF: 0.00191

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.000676 AC: 103 AN: 152270 Hom.: 0 Cov.: 32 AF XY: 0.000618 AC XY: 46 AN XY: 74460

African (AFR) AF: 0.000169 AC: 7 AN: 41542

American (AMR) AF: 0.00137 AC: 21 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.000576 AC: 2 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.000472 AC: 5 AN: 10602

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000941 AC: 64 AN: 68022

Other (OTH) AF: 0.00189 AC: 4 AN: 2114

Alfa AF: 0.000971 Hom.: 0

Bravo AF: 0.000997

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	0.73
DANN	Benign	0.59
PhyloP100		-0.82

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

Other links and lift over

dbSNP: rs34299096; hg19: chr1-207504187;