chr19-8302543-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_016579.4(CD320):c.769G>A(p.Glu257Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00249 in 1,614,076 control chromosomes in the GnomAD database, including 82 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.012 ( 37 hom., cov: 32)

Exomes 𝑓: 0.0015 ( 45 hom. )

Consequence

CD320
NM_016579.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -0.146

Variant links:

Genes affected

CD320 (HGNC:16692): (CD320 molecule) This gene encodes the transcobalamin receptor that is expressed at the cell surface. It mediates the cellular uptake of transcobalamin bound cobalamin (vitamin B12), and is involved in B-cell proliferation and immunoglobulin secretion. Mutations in this gene are associated with methylmalonic aciduria. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Jan 2011]

CD320 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.003944248).

BP6

Variant 19-8302543-C-T is Benign according to our data. Variant chr19-8302543-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 382056.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.012 (1827/152302) while in subpopulation AFR AF= 0.0409 (1698/41554). AF 95% confidence interval is 0.0392. There are 37 homozygotes in gnomad4. There are 885 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 37 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CD320	NM_016579.4 link	c.769G>A	p.Glu257Lys	missense_variant	Exon 5 of 5	ENST00000301458.10	NP_057663.1	Q9NPF0-1
CD320	NM_001165895.2 link	c.643G>A	p.Glu215Lys	missense_variant	Exon 4 of 4		NP_001159367.1	Q9NPF0-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CD320	ENST00000301458.10 link	c.769G>A	p.Glu257Lys	missense_variant	Exon 5 of 5	1	NM_016579.4	ENSP00000301458.4		Q9NPF0-1

Frequencies

GnomAD3 genomes

AF:

0.0120

AC:

1824

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0409

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00556

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000620

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.000250

Gnomad OTH

AF:

0.0110

GnomAD3 exomes

AF:

0.00323

AC:

811

AN:

251092

Hom.:

AF XY:

0.00236

AC XY:

320

AN XY:

135762

show subpopulations

Gnomad AFR exome

AF:

0.0413

Gnomad AMR exome

AF:

0.00266

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000196

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000247

Gnomad OTH exome

AF:

0.00245

GnomAD4 exome

AF:

0.00150

AC:

2190

AN:

1461774

Hom.:

Cov.:

AF XY:

0.00136

AC XY:

989

AN XY:

727168

show subpopulations

Gnomad4 AFR exome

AF:

0.0469

Gnomad4 AMR exome

AF:

0.00324

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.000185

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000201

Gnomad4 OTH exome

AF:

0.00344

GnomAD4 genome

AF:

0.0120

AC:

1827

AN:

152302

Hom.:

Cov.:

AF XY:

0.0119

AC XY:

885

AN XY:

74464

show subpopulations

Gnomad4 AFR

AF:

0.0409

Gnomad4 AMR

AF:

0.00556

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000621

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000250

Gnomad4 OTH

AF:

0.0109

Alfa

AF:

0.00241

Hom.:

Bravo

AF:

0.0141

ESP6500AA

AF:

0.0361

AC:

159

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00361

AC:

438

Asia WGS

AF:

0.00231

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.000237

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Feb 22, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 20, 2021

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Methylmalonic acidemia due to transcobalamin receptor defect

Benign:2

Sep 22, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.21

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.23

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.070

.;T

Eigen

Benign

-0.54

Eigen_PC

Benign

-0.64

FATHMM_MKL

Benign

0.030

LIST_S2

Benign

0.72

T;T

MetaRNN

Benign

0.0039

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.90

.;L

PrimateAI

Benign

0.37

PROVEAN

Benign

-1.1

N;N

REVEL

Benign

0.13

Sift

Benign

0.034

D;T

Sift4G

Benign

0.14

T;T

Polyphen

0.063

.;B

Vest4

0.20

MVP

0.95

MPC

0.15

ClinPred

0.0030

GERP RS

2.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.027

gMVP

0.49

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over