chr12-119179322-G-C

Variant names:

• chr12-119179322-G-C
• rs762887808
• NM_014365.3:c.10G>C

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_014365.3(HSPB8):​c.10G>C​(p.Gly4Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,412 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G4D) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: HSPB8 NM_014365.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.84
• Publications: 2 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.169083).
• BS2: High AC in GnomAdExome4 at 9 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_014365.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HSPB8	NM_014365.3	MANE Select	c.10G>C	p.Gly4Arg	missense	Exon 1 of 3	NP_055180.1	Q9UJY1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HSPB8	ENST00000281938.7	TSL:1 MANE Select	c.10G>C	p.Gly4Arg	missense	Exon 1 of 3	ENSP00000281938.3	Q9UJY1
	HSPB8	ENST00000674542.1		c.10G>C	p.Gly4Arg	missense	Exon 1 of 2	ENSP00000502352.1	A0A6Q8PGM6
	HSPB8	ENST00000676244.1		n.73+5324G>C		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000399 AC: 1 AN: 250486 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461412 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727068

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52976

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000719 AC: 8 AN: 1111986

Other (OTH) AF: 0.0000166 AC: 1 AN: 60386

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Charcot-Marie-Tooth disease axonal type 2L (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.37
BayesDel_addAF	Uncertain	0.016	T
BayesDel_noAF	Benign	-0.21
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.059	T
Eigen	Benign	0.14
Eigen_PC	Benign	0.17
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.85	D
M_CAP	Uncertain	0.12	D
MetaRNN	Benign	0.17	T
MetaSVM	Benign	-0.52	T
MutationAssessor	Benign	0.24	N
PhyloP100		1.8
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	0.60	N
REVEL	Benign	0.27
Sift	Benign	0.24	T
Sift4G	Benign	0.36	T
Polyphen		0.96	D
Vest4		0.18
MutPred		0.22		Gain of catalytic residue at A2 (P = 0.0157)
MVP		0.96
MPC		0.76
ClinPred		0.59	D
GERP RS		4.4
PromoterAI		-0.036	Neutral
Varity_R		0.12
gMVP		0.54
Mutation Taster		=86/14	polymorphism

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

Other links and lift over

dbSNP: rs762887808; hg19: chr12-119617127;