Genetic Variant HSPB1:c.365-7C>A (chr7-76303795-C-A) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001540.5(HSPB1):c.365-7C>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,458,776 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

HSPB1
NM_001540.5 splice_region, intron

Scores

Splicing: ADA: 0.009586

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.261

Publications

0 publications found

Variant links:

Genes affected

HSPB1 (HGNC:5246): (heat shock protein family B (small) member 1) This gene encodes a member of the small heat shock protein (HSP20) family of proteins. In response to environmental stress, the encoded protein translocates from the cytoplasm to the nucleus and functions as a molecular chaperone that promotes the correct folding of other proteins. This protein plays an important role in the differentiation of a wide variety of cell types. Expression of this gene is correlated with poor clinical outcome in multiple human cancers, and the encoded protein may promote cancer cell proliferation and metastasis, while protecting cancer cells from apoptosis. Mutations in this gene have been identified in human patients with Charcot-Marie-Tooth disease and distal hereditary motor neuropathy. [provided by RefSeq, Aug 2017]

HSPB1 Gene-Disease associations (from GenCC):

Charcot-Marie-Tooth disease axonal type 2F
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Illumina, Labcorp Genetics (formerly Invitae), ClinGen, Orphanet
neuronopathy, distal hereditary motor, type 2B
Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
distal hereditary motor neuropathy type 2
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

HSPB1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

This position, referring to a specific DNA site, is a probable branch point but is likely benign (scored 1 / 10, using the threshold of <=3). The score ranges from 0 to 10, with values ≤3 considered benign and >5 classified as pathogenic. Computational evidence support a benign effect (BayesDel_noAF=-0.7).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001540.5. 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
	HSPB1	NM_001540.5	MANE Select	c.365-7C>A		splice_region intron	N/A	NP_001531.1	P04792

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
HSPB1	ENST00000248553.7	TSL:1 MANE Select	c.365-7C>A	splice_region intron	N/A	ENSP00000248553.6	P04792
HSPB1	ENST00000429938.1	TSL:1	c.-140-7C>A	splice_region intron	N/A	ENSP00000405285.1	C9J3N8
HSPB1	ENST00000447574.1	TSL:1	n.1108C>A	non_coding_transcript_exon	Exon 1 of 2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1458776

Hom.:

Cov.:

AF XY:

0.00000276

AC XY:

AN XY:

725706

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33404

American (AMR)

AF:

0.00

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86158

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52588

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4160

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111724

Other (OTH)

AF:

0.00

AC:

AN:

60194

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.70

CADD

Benign

6.3

(source)

DANN

Benign

0.77

PhyloP100

-0.26

BranchPoint Hunter

1.0

PromoterAI

-0.072

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.0096

dbscSNV1_RF

Benign

0.18

SpliceAI score (max)

0.040

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over