3-122740842-A-G

Variant names:

• chr3-122740842-A-G
• rs1933642225
• NM_024610.6:c.970T>C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_024610.6(HSPBAP1):​c.970T>C​(p.Tyr324His) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,822 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: HSPBAP1 NM_024610.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.45

Genes affected

HSPBAP1 (HGNC:16389): (HSPB1 associated protein 1) This gene encodes a protein that binds to one of the small heat shock proteins, specifically hsp27. Hsp27 is involved with cell growth and differentiation. This encoded protein was found to be abnormally expressed in patients with intractable epilepsy, although how brain function is affected remains unknown. [provided by RefSeq, Sep 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.745

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HSPBAP1	NM_024610.6	c.970T>C	p.Tyr324His	missense_variant	Exon 8 of 8	ENST00000306103.3	NP_078886.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HSPBAP1	ENST00000306103.3	c.970T>C	p.Tyr324His	missense_variant	Exon 8 of 8	1	NM_024610.6	ENSP00000302562.2
HSPBAP1	ENST00000471534.1	n.808T>C		non_coding_transcript_exon_variant	Exon 2 of 2	1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461822 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727212

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000468 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Sep 03, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.970T>C (p.Y324H) alteration is located in exon 8 (coding exon 8) of the HSPBAP1 gene. This alteration results from a T to C substitution at nucleotide position 970, causing the tyrosine (Y) at amino acid position 324 to be replaced by a histidine (H). 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	0.26
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.12	T
Eigen	Pathogenic	0.70
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.74	T
M_CAP	Benign	0.016	T
MetaRNN	Pathogenic	0.75	D
MetaSVM	Benign	-0.78	T
MutationAssessor	Uncertain	2.6	M
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-2.4	N
REVEL	Uncertain	0.31
Sift	Uncertain	0.0020	D
Sift4G	Benign	0.065	T
Polyphen		1.0	D
Vest4		0.75
MutPred		0.58		Gain of disorder (P = 0.183);
MVP		0.58
MPC		0.93
ClinPred		0.92	D
GERP RS		5.4
Varity_R		0.18
gMVP		0.64

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: rs1933642225; hg19: chr3-122459689;