rs112052602

chr12-119193819-C-T

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_014365.3(HSPB8):c.552C>T(p.Asn184=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00278 in 1,614,148 control chromosomes in the GnomAD database, including 106 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.014 (52 hom., cov: 32)
  • Exomes 𝑓: 0.0016 (54 hom.)
• Consequence: HSPB8 NM_014365.3 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: -2.47

Genes affected

HSPB8 (HGNC:30171): (heat shock protein family B (small) member 8) The protein encoded by this gene belongs to the superfamily of small heat-shock proteins containing a conservative alpha-crystallin domain at the C-terminal part of the molecule. The expression of this gene in induced by estrogen in estrogen receptor-positive breast cancer cells, and this protein also functions as a chaperone in association with Bag3, a stimulator of macroautophagy. Thus, this gene appears to be involved in regulation of cell proliferation, apoptosis, and carcinogenesis, and mutations in this gene have been associated with different neuromuscular diseases, including Charcot-Marie-Tooth disease. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.69).
• BP6: Variant 12-119193819-C-T is Benign according to our data. Variant chr12-119193819-C-T is described in ClinVar as [Benign]. Clinvar id is 307419.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-119193819-C-T is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=-2.47 with no splicing effect.
• BA1: GnomAdExome4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0502 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HSPB8	NM_014365.3	c.552C>T	p.Asn184=	synonymous_variant	3/3	ENST00000281938.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HSPB8	ENST00000281938.7	c.552C>T	p.Asn184=	synonymous_variant	3/3	1	NM_014365.3	P1

Frequencies

GnomAD3 genomes AF: 0.0138 AC: 2103 AN: 152152 Hom.: 50 Cov.: 32

Gnomad AFR AF: 0.0464

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00851

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0222

Gnomad NFE AF: 0.000191

Gnomad OTH AF: 0.0144

GnomAD3 exomes AF: 0.00387 AC: 973 AN: 251488 Hom.: 22 AF XY: 0.00261 AC XY: 355 AN XY: 135918

Gnomad AFR exome AF: 0.0492

Gnomad AMR exome AF: 0.00356

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000272

Gnomad OTH exome AF: 0.00261

GnomAD4 exome AF: 0.00162 AC: 2371 AN: 1461878 Hom.: 54 Cov.: 31 AF XY: 0.00140 AC XY: 1015 AN XY: 727244

Gnomad4 AFR exome AF: 0.0523

Gnomad4 AMR exome AF: 0.00407

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000197

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000171

Gnomad4 OTH exome AF: 0.00339

GnomAD4 genome AF: 0.0139 AC: 2118 AN: 152270 Hom.: 52 Cov.: 32 AF XY: 0.0132 AC XY: 986 AN XY: 74462

Gnomad4 AFR AF: 0.0466

Gnomad4 AMR AF: 0.00850

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000191

Gnomad4 OTH AF: 0.0142

Alfa AF: 0.00709 Hom.: 9

Bravo AF: 0.0166

Asia WGS AF: 0.00289 AC: 10 AN: 3478

EpiCase AF: 0.000436

EpiControl AF: 0.000415

ClinVar

Significance: Benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	May 20, 2015	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Aug 09, 2017	- -

Charcot-Marie-Tooth disease axonal type 2L Benign:2

Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 29, 2024	- -

Neuronopathy, distal hereditary motor, type 2A Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Oct 30, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
Cadd	Benign	0.16
Dann	Benign	0.78

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: rs112052602; hg19: chr12-119631624;