chr6-33204923-G-C

Position:

• chr6-33204923-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The ENST00000374662.4(HSD17B8):​c.74G>C​(p.Arg25Pro) variant causes a missense change. The variant allele was found at a frequency of 0.000000762 in 1,312,630 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: 33)
  • Exomes 𝑓: 7.6e-7 (0 hom.)
• Consequence: HSD17B8 ENST00000374662.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.94

Genes affected

HSD17B8 (HGNC:3554): (hydroxysteroid 17-beta dehydrogenase 8) In mice, the Ke6 protein is a 17-beta-hydroxysteroid dehydrogenase that can regulate the concentration of biologically active estrogens and androgens. It is preferentially an oxidative enzyme and inactivates estradiol, testosterone, and dihydrotestosterone. However, the enzyme has some reductive activity and can synthesize estradiol from estrone. The protein encoded by this gene is similar to Ke6 and is a member of the short-chain dehydrogenase superfamily. An alternatively spliced transcript of this gene has been detected, but the full-length nature of this variant has not been determined. [provided by RefSeq, Jul 2008]

HSD17B8 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.851

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HSD17B8	NM_014234.5	c.74G>C	p.Arg25Pro	missense_variant	2/9	ENST00000374662.4	NP_055049.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HSD17B8	ENST00000374662.4	c.74G>C	p.Arg25Pro	missense_variant	2/9	1	NM_014234.5	ENSP00000363794.3
HSD17B8	ENST00000469186.1	n.238G>C		non_coding_transcript_exon_variant	1/7	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.62e-7 AC: 1 AN: 1312630 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 639022

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: 9.60e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 28, 2023

The c.74G>C (p.R25P) alteration is located in exon 2 (coding exon 2) of the HSD17B8 gene. This alteration results from a G to C substitution at nucleotide position 74, causing the arginine (R) at amino acid position 25 to be replaced by a proline (P). 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	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Benign	0.031	T
Eigen	Pathogenic	0.74
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.83	D
M_CAP	Pathogenic	0.34	D
MetaRNN	Pathogenic	0.85	D
MetaSVM	Benign	-0.59	T
MutationAssessor	Pathogenic	2.9	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-5.7	D
REVEL	Uncertain	0.56
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0040	D
Polyphen		1.0	D
Vest4		0.64
MutPred		0.65		Loss of MoRF binding (P = 6e-04);
MVP		0.75
MPC		1.3
ClinPred		1.0	D
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.99
gMVP		0.87

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1265767096; hg19: chr6-33172700;