chr5-34929862-A-C

Position:

• chr5-34929862-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001012339.3(DNAJC21):​c.43A>C​(p.Ser15Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000357 in 1,398,960 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 29)
  • Exomes 𝑓: 0.0000036 (0 hom.)
• Consequence: DNAJC21 NM_001012339.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.197

Genes affected

DNAJC21 (HGNC:27030): (DnaJ heat shock protein family (Hsp40) member C21) This gene encodes a member of the DNAJ heat shock protein 40 family of proteins that is characterized by two N-terminal tetratricopeptide repeat domains and a C-terminal DNAJ domain. This protein binds the precursor 45S ribosomal RNA and may be involved in early nuclear ribosomal RNA biogenesis and maturation of the 60S ribosomal subunit. Mutations in this gene result in Bone marrow failure syndrome 3. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Feb 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.39472225).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DNAJC21	NM_001012339.3	c.43A>C	p.Ser15Arg	missense_variant	1/12	ENST00000648817.1	NP_001012339.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DNAJC21	ENST00000648817.1	c.43A>C	p.Ser15Arg	missense_variant	1/12		NM_001012339.3	ENSP00000497410	P1

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD4 exome AF: 0.00000357 AC: 5 AN: 1398960 Hom.: 0 Cov.: 31 AF XY: 0.00000431 AC XY: 3 AN XY: 696546

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000463

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 29

Alfa AF: 0.0000468 Hom.: 0

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

Labcorp Genetics (formerly Invitae), Labcorp

Oct 19, 2020

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 missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with DNAJC21-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with arginine at codon 15 of the DNAJC21 protein (p.Ser15Arg). The serine residue is moderately conserved and there is a moderate physicochemical difference between serine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.80
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.44	T;T;.;.
Eigen	Uncertain	0.29
Eigen_PC	Benign	0.16
FATHMM_MKL	Benign	0.46	N
LIST_S2	Benign	0.84	.;T;T;T
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.39	T;T;T;T
MetaSVM	Benign	-0.78	T
MutationAssessor	Uncertain	2.8	M;M;M;M
MutationTaster	Benign	0.93	D;D;D
PrimateAI	Pathogenic	0.91	D
PROVEAN	Uncertain	-2.6	.;D;D;.
REVEL	Benign	0.21
Sift	Benign	0.12	.;T;T;.
Sift4G	Benign	0.35	.;T;T;.
Polyphen		0.91	P;P;D;.
Vest4		0.19, 0.22
MutPred		0.56		Loss of phosphorylation at S15 (P = 0.0085);Loss of phosphorylation at S15 (P = 0.0085);Loss of phosphorylation at S15 (P = 0.0085);Loss of phosphorylation at S15 (P = 0.0085);
MVP		0.51
MPC		0.37
ClinPred		0.88	D
GERP RS		2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.22
gMVP		0.48

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: rs1441391830; hg19: chr5-34929967;