chr20-3742297-G-A

Position:

• chr20-3742297-G-A

Variant summary

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

The NM_052970.5(HSPA12B):​c.155G>A​(p.Arg52Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000889 in 1,461,656 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: 32)
  • Exomes 𝑓: 0.0000089 (0 hom.)
• Consequence: HSPA12B NM_052970.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.41

Genes affected

HSPA12B (HGNC:16193): (heat shock protein family A (Hsp70) member 12B) The protein encoded by this gene contains an atypical heat shock protein 70 (Hsp70) ATPase domain and is therefore a distant member of the mammalian Hsp70 family. This gene may be involved in susceptibility to atherosclerosis. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Dec 2015]

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=0.19831467).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HSPA12B	NM_052970.5	c.155G>A	p.Arg52Gln	missense_variant	4/13	ENST00000254963.7	NP_443202.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HSPA12B	ENST00000254963.7	c.155G>A	p.Arg52Gln	missense_variant	4/13	1	NM_052970.5	ENSP00000254963	P1
HSPA12B	ENST00000399701.1	c.-104G>A		5_prime_UTR_variant	3/12	1		ENSP00000382608

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000889 AC: 13 AN: 1461656 Hom.: 0 Cov.: 31 AF XY: 0.00000963 AC XY: 7 AN XY: 727100

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000108

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000282 Hom.: 0

Bravo AF: 0.0000227

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 16, 2021

The c.155G>A (p.R52Q) alteration is located in exon 4 (coding exon 3) of the HSPA12B gene. This alteration results from a G to A substitution at nucleotide position 155, causing the arginine (R) at amino acid position 52 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.0050	T
Eigen	Uncertain	0.19
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.78	T
M_CAP	Benign	0.0076	T
MetaRNN	Benign	0.20	T
MetaSVM	Benign	-0.78	T
MutationAssessor	Benign	1.3	L
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.43	T
PROVEAN	Benign	0.080	N
REVEL	Benign	0.15
Sift	Benign	0.36	T
Sift4G	Benign	0.53	T
Polyphen		0.93	P
Vest4		0.21
MutPred		0.41		Gain of helix (P = 0.0854);
MVP		0.59
MPC		0.032
ClinPred		0.80	D
GERP RS		4.6
Varity_R		0.099
gMVP		0.32

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: rs1310609752; hg19: chr20-3722944; COSMIC: COSV54769353;