NM_001770.6:c.61G>A

Variant names:

• chr16-28932061-G-A
• rs771929657
• NM_001770.6:c.61G>A

Variant summary

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

The NM_001770.6(CD19):​c.61G>A​(p.Glu21Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000246 in 1,461,814 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.000025 (0 hom.)
• Consequence: CD19 NM_001770.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.837

Genes affected

CD19 (HGNC:1633): (CD19 molecule) This gene encodes a member of the immunoglobulin gene superfamily. Expression of this cell surface protein is restricted to B cell lymphocytes. This protein is a reliable marker for pre-B cells but its expression diminishes during terminal B cell differentiation in antibody secreting plasma cells. The protein has two N-terminal extracellular Ig-like domains separated by a non-Ig-like domain, a hydrophobic transmembrane domain, and a large C-terminal cytoplasmic domain. This protein forms a complex with several membrane proteins including complement receptor type 2 (CD21) and tetraspanin (CD81) and this complex reduces the threshold for antigen-initiated B cell activation. Activation of this B-cell antigen receptor complex activates the phosphatidylinositol 3-kinase signalling pathway and the subsequent release of intracellular stores of calcium ions. This protein is a target of chimeric antigen receptor (CAR) T-cells used in the treatment of lymphoblastic leukemia. Mutations in this gene are associated with the disease common variable immunodeficiency 3 (CVID3) which results in a failure of B-cell differentiation and impaired secretion of immunoglobulins. CVID3 is characterized by hypogammaglobulinemia, an inability to mount an antibody response to antigen, and recurrent bacterial infections. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2020]

RABEP2 (HGNC:24817): (rabaptin, RAB GTPase binding effector protein 2) Predicted to enable GTPase activator activity and growth factor activity. Involved in regulation of cilium assembly. Located in cytosol; intracellular membrane-bounded organelle; and microtubule organizing center. [provided by Alliance of Genome Resources, Apr 2022]

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=0.084705055).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CD19	NM_001770.6	c.61G>A	p.Glu21Lys	missense_variant	Exon 1 of 15	ENST00000538922.8	NP_001761.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CD19	ENST00000538922.8	c.61G>A	p.Glu21Lys	missense_variant	Exon 1 of 15	5	NM_001770.6	ENSP00000437940.2
CD19	ENST00000324662.8	c.61G>A	p.Glu21Lys	missense_variant	Exon 1 of 15	1		ENSP00000313419.4
RABEP2	ENST00000566762.1	c.-150+4203C>T		intron_variant	Intron 1 of 3	4		ENSP00000454974.1
CD19	ENST00000565089.5	n.97G>A		non_coding_transcript_exon_variant	Exon 1 of 13	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000795 AC: 2 AN: 251482 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135916

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000246 AC: 36 AN: 1461814 Hom.: 0 Cov.: 31 AF XY: 0.0000151 AC XY: 11 AN XY: 727218

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0000348

Gnomad4 FIN exome AF: 0.0000374

Gnomad4 NFE exome AF: 0.0000243

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.47	.;T;.
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.043	N
LIST_S2	Benign	0.50	T;T;.
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.085	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N;N;N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-1.3	N;N;N
REVEL	Benign	0.058
Sift	Uncertain	0.0080	D;D;D
Sift4G	Benign	0.066	T;T;T
Polyphen		0.040	.;B;.
Vest4		0.22
MutPred		0.30		Gain of methylation at E21 (P = 0.0148);Gain of methylation at E21 (P = 0.0148);Gain of methylation at E21 (P = 0.0148);
MVP		0.39
MPC		0.29
ClinPred		0.12	T
GERP RS		2.1
Varity_R		0.26
gMVP		0.58

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

LitVar

Other links and lift over

dbSNP: rs771929657; hg19: chr16-28943382; COSMIC: COSV100218226; COSMIC: COSV100218226;