rs74740454

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_014365.3(HSPB8):c.535G>C(p.Glu179Gln) variant causes a missense change. The variant allele was found at a frequency of 0.000893 in 1,614,190 control chromosomes in the GnomAD database, including 18 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E179G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0049 ( 10 hom., cov: 32)

Exomes 𝑓: 0.00048 ( 8 hom. )

Consequence

HSPB8
NM_014365.3 missense

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 6.02

Publications

4 publications found

Variant links:

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]

HSPB8 Gene-Disease associations (from GenCC):

neuronopathy, distal hereditary motor, autosomal dominant
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
Charcot-Marie-Tooth disease axonal type 2L
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
neuronopathy, distal hereditary motor, type 2A
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
autosomal dominant distal axonal motor neuropathy-myofibrillar myopathy syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
distal hereditary motor neuropathy type 2
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

HSPB8 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0069710314).

BP6

Variant 12-119193802-G-C is Benign according to our data. Variant chr12-119193802-G-C is described in ClinVar as Benign. ClinVar VariationId is 307418.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 = 0.0049 (746/152304) while in subpopulation AFR AF = 0.0173 (717/41554). AF 95% confidence interval is 0.0162. There are 10 homozygotes in GnomAd4. There are 369 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 746 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HSPB8	NM_014365.3 link	c.535G>C	p.Glu179Gln	missense_variant	Exon 3 of 3	ENST00000281938.7	NP_055180.1	Q9UJY1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HSPB8	ENST00000281938.7 link	c.535G>C	p.Glu179Gln	missense_variant	Exon 3 of 3	1	NM_014365.3	ENSP00000281938.3		Q9UJY1

Frequencies

GnomAD3 genomes

AF:

0.00489

AC:

744

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0173

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00111

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00335

GnomAD2 exomes

AF:

0.00134

AC:

336

AN:

251494

AF XY:

0.00102

show subpopulations

Gnomad AFR exome

AF:

0.0177

Gnomad AMR exome

AF:

0.00101

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000703

Gnomad OTH exome

AF:

0.000814

GnomAD4 exome

AF:

0.000475

AC:

695

AN:

1461886

Hom.:

Cov.:

AF XY:

0.000414

AC XY:

301

AN XY:

727244

show subpopulations

African (AFR)

AF:

0.0160

AC:

535

AN:

33480

American (AMR)

AF:

0.00121

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00121

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000225

AC:

AN:

1112004

Other (OTH)

AF:

0.00118

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.452

Heterozygous variant carriers

130

174

217

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00490

AC:

746

AN:

152304

Hom.:

Cov.:

AF XY:

0.00496

AC XY:

369

AN XY:

74470

show subpopulations

African (AFR)

AF:

0.0173

AC:

717

AN:

41554

American (AMR)

AF:

0.00111

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.000207

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000588

AC:

AN:

68038

Other (OTH)

AF:

0.00331

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

107

142

178

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000726

Hom.:

Bravo

AF:

0.00537

ESP6500AA

AF:

0.0161

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00170

AC:

207

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

Significance: Benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Sep 15, 2020

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 17, 2017

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. -

Charcot-Marie-Tooth disease axonal type 2L

Benign:2

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. -

Neuronopathy, distal hereditary motor, type 2A

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Neuronopathy, distal hereditary motor, type 2A;C1837552:Charcot-Marie-Tooth disease axonal type 2L

Benign:1

Oct 14, 2021

Fulgent Genetics, Fulgent Genetics

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

0.12

BayesDel_addAF

Benign

-0.38

BayesDel_noAF

Benign

-0.30

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.30

Eigen

Benign

0.034

Eigen_PC

Benign

0.13

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.78

MetaRNN

Benign

0.0070

MetaSVM

Benign

-0.35

MutationAssessor

Benign

1.2

PhyloP100

6.0

PrimateAI

Benign

0.47

PROVEAN

Benign

-0.75

REVEL

Benign

0.29

Sift

Uncertain

0.011

Sift4G

Benign

0.12

Polyphen

0.41

Vest4

0.12

MVP

0.96

MPC

0.43

ClinPred

0.018

GERP RS

3.6

Varity_R

0.20

gMVP

0.36

Mutation Taster

=85/15

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over