5-74685135-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The ENST00000511181.5(HEXB):c.-376-4193C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.564 in 1,052,904 control chromosomes in the GnomAD database, including 169,446 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.55 (23248 hom., cov: 31)
  • Exomes 𝑓: 0.57 (146198 hom.)
• Consequence: HEXB ENST00000511181.5 intron
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: -0.274

Genes affected

HEXB (HGNC:4879): (hexosaminidase subunit beta) Hexosaminidase B is the beta subunit of the lysosomal enzyme beta-hexosaminidase that, together with the cofactor GM2 activator protein, catalyzes the degradation of the ganglioside GM2, and other molecules containing terminal N-acetyl hexosamines. Beta-hexosaminidase is composed of two subunits, alpha and beta, which are encoded by separate genes. Both beta-hexosaminidase alpha and beta subunits are members of family 20 of glycosyl hydrolases. Mutations in the alpha or beta subunit genes lead to an accumulation of GM2 ganglioside in neurons and neurodegenerative disorders termed the GM2 gangliosidoses. Beta subunit gene mutations lead to Sandhoff disease (GM2-gangliosidosis type II). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2014]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.52).
• BP6: Variant 5-74685135-C-T is Benign according to our data. Variant chr5-74685135-C-T is described in ClinVar as [Benign]. Clinvar id is 369506.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.567 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HEXB	NM_001292004.2	c.-376-4193C>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HEXB	ENST00000511181.5	c.-376-4193C>T		intron_variant		1

Frequencies

GnomAD3 genomes AF: 0.550 AC: 83239 AN: 151228 Hom.: 23230 Cov.: 31

Gnomad AFR AF: 0.558

Gnomad AMI AF: 0.459

Gnomad AMR AF: 0.413

Gnomad ASJ AF: 0.577

Gnomad EAS AF: 0.461

Gnomad SAS AF: 0.552

Gnomad FIN AF: 0.622

Gnomad MID AF: 0.582

Gnomad NFE AF: 0.572

Gnomad OTH AF: 0.552

GnomAD4 exome AF: 0.567 AC: 511065 AN: 901556 Hom.: 146198 Cov.: 12 AF XY: 0.566 AC XY: 253380 AN XY: 447706

Gnomad4 AFR exome AF: 0.559

Gnomad4 AMR exome AF: 0.377

Gnomad4 ASJ exome AF: 0.578

Gnomad4 EAS exome AF: 0.478

Gnomad4 SAS exome AF: 0.568

Gnomad4 FIN exome AF: 0.623

Gnomad4 NFE exome AF: 0.572

Gnomad4 OTH exome AF: 0.557

GnomAD4 genome AF: 0.550 AC: 83292 AN: 151348 Hom.: 23248 Cov.: 31 AF XY: 0.549 AC XY: 40614 AN XY: 73918

Gnomad4 AFR AF: 0.558

Gnomad4 AMR AF: 0.412

Gnomad4 ASJ AF: 0.577

Gnomad4 EAS AF: 0.461

Gnomad4 SAS AF: 0.552

Gnomad4 FIN AF: 0.622

Gnomad4 NFE AF: 0.572

Gnomad4 OTH AF: 0.550

Alfa AF: 0.363 Hom.: 693

Bravo AF: 0.531

Asia WGS AF: 0.470 AC: 1634 AN: 3474

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Sandhoff disease Benign:3

Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jun 14, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Invitae	Feb 01, 2024	- -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 19, 2018

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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.52
Cadd	Benign	16
Dann	Uncertain	0.98

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs71627068; hg19: chr5-73980960;