19-47319781-G-C

Position:

• chr19-47319781-G-C

Variant summary

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

The NM_001736.4(C5AR1):​c.4G>C​(p.Asp2His) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 16/23 in silico tools predict 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D2N) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: C5AR1 NM_001736.4 missense, splice_region
• Scores: Splicing: ADA: 0.04335
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.254

Genes affected

C5AR1 (HGNC:1338): (complement C5a receptor 1) Enables G protein-coupled receptor activity and complement component C5a receptor activity. Involved in several processes, including complement component C5a signaling pathway; mRNA transcription by RNA polymerase II; and positive regulation of ERK1 and ERK2 cascade. Located in apical part of cell and basolateral plasma membrane. Biomarker of Alzheimer's disease; asthma; chronic obstructive pulmonary disease; rhinitis; and severe acute respiratory syndrome. [provided by Alliance of Genome Resources, Apr 2022]

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
C5AR1	NM_001736.4	c.4G>C	p.Asp2His	missense_variant, splice_region_variant	2/2	ENST00000355085.4	NP_001727.2
C5AR1	XM_047439300.1	c.106G>C	p.Asp36His	missense_variant, splice_region_variant	3/3		XP_047295256.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
C5AR1	ENST00000355085.4	c.4G>C	p.Asp2His	missense_variant, splice_region_variant	2/2	1	NM_001736.4	ENSP00000347197.2
C5AR1	ENST00000594787.1	c.-354G>C		splice_region_variant	4/4	5		ENSP00000470613.1
C5AR1	ENST00000594787	c.-354G>C		5_prime_UTR_variant	4/4	5		ENSP00000470613.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	18
DANN	Benign	0.95
DEOGEN2	Benign	0.20	T
Eigen	Benign	-0.55
Eigen_PC	Benign	-0.65
FATHMM_MKL	Benign	0.21	N
LIST_S2	Benign	0.25	T
M_CAP	Benign	0.011	T
MetaRNN	Uncertain	0.44	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.9	L
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.5	N
REVEL	Benign	0.051
Sift	Uncertain	0.022	D
Sift4G	Uncertain	0.016	D
Polyphen		0.84	P
Vest4		0.10
MutPred		0.14		Loss of phosphorylation at Y6 (P = 0.2055);
MVP		0.52
MPC		0.54
ClinPred		0.73	D
GERP RS		1.7
Varity_R		0.12
gMVP		0.39

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.043
dbscSNV1_RF	Benign	0.22
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs4467185; hg19: chr19-47823038;