2-219279876-T-C

Position:

• chr2-219279876-T-C

Variant summary

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

The NM_006736.6(DNAJB2):​c.43T>C​(p.Ser15Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,744 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DNAJB2 NM_006736.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.34

Genes affected

DNAJB2 (HGNC:5228): (DnaJ heat shock protein family (Hsp40) member B2) This gene is almost exclusively expressed in the brain, mainly in the neuronal layers. It encodes a protein that shows sequence similarity to bacterial DnaJ protein and the yeast homologs. In bacteria, this protein is implicated in protein folding and protein complex dissociation. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2011]

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
DNAJB2	NM_006736.6	c.43T>C	p.Ser15Pro	missense_variant	2/9	ENST00000336576.10	NP_006727.2
DNAJB2	NM_001039550.2	c.43T>C	p.Ser15Pro	missense_variant	2/10		NP_001034639.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DNAJB2	ENST00000336576.10	c.43T>C	p.Ser15Pro	missense_variant	2/9	1	NM_006736.6	ENSP00000338019.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461744 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 727190

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neuronopathy, distal hereditary motor, autosomal recessive 5 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 26, 2019

This sequence change replaces serine with proline at codon 15 of the DNAJB2 protein (p.Ser15Pro). The serine residue is moderately conserved and there is a moderate physicochemical difference between serine and proline. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with DNAJB2-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.42
BayesDel_addAF	Benign	-0.029	T
BayesDel_noAF	Benign	-0.28
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.21	T;T;.;T;T;.;T
Eigen	Uncertain	0.31
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.95	D;D;D;D;D;D;D
M_CAP	Benign	0.031	D
MetaRNN	Uncertain	0.58	D;D;D;D;D;D;D
MetaSVM	Benign	-0.89	T
MutationAssessor	Uncertain	2.3	M;.;M;.;.;.;.
PrimateAI	Uncertain	0.66	T
PROVEAN	Uncertain	-3.6	D;D;D;D;D;D;D
REVEL	Benign	0.26
Sift	Uncertain	0.0010	D;D;D;D;D;D;D
Sift4G	Uncertain	0.0040	D;D;D;D;D;D;D
Polyphen		0.92	P;.;D;.;.;.;.
Vest4		0.34
MutPred		0.59		Loss of phosphorylation at S15 (P = 0.0171);Loss of phosphorylation at S15 (P = 0.0171);Loss of phosphorylation at S15 (P = 0.0171);Loss of phosphorylation at S15 (P = 0.0171);Loss of phosphorylation at S15 (P = 0.0171);Loss of phosphorylation at S15 (P = 0.0171);Loss of phosphorylation at S15 (P = 0.0171);
MVP		0.23
MPC		0.62
ClinPred		0.99	D
GERP RS		3.6
Varity_R		0.95
gMVP		0.60

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: rs1223035732; hg19: chr2-220144598;