chr3-50294801-A-G

Variant names:

• chr3-50294801-A-G
• rs1701775735
• NM_003549.4:c.802T>C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_003549.4(HYAL3):​c.802T>C​(p.Phe268Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000292 in 1,368,638 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000029 (0 hom.)
• Consequence: HYAL3 NM_003549.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.314

Genes affected

HYAL3 (HGNC:5322): (hyaluronidase 3) This gene encodes a member of the hyaluronidase family. Hyaluronidases are endoglycosidase enzymes that degrade hyaluronan, one of the major glycosaminoglycans of the extracellular matrix. The regulated turnover of hyaluronan plays a critical role in many biological processes including cell proliferation, migration and differentiation. The encoded protein may also play an important role in sperm function. This gene is one of several related genes in a region of chromosome 3p21.3 associated with tumor suppression, and the expression of specific transcript variants may be indicative of tumor status. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene, and some isoforms may lack hyaluronidase activity. This gene overlaps and is on the same strand as N-acetyltransferase 6 (GCN5-related), and some transcripts of each gene share a portion of the first exon. [provided by RefSeq, Jan 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20436665).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HYAL3	NM_003549.4	c.802T>C	p.Phe268Leu	missense_variant	Exon 2 of 4	ENST00000336307.6	NP_003540.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HYAL3	ENST00000336307.6	c.802T>C	p.Phe268Leu	missense_variant	Exon 2 of 4	1	NM_003549.4	ENSP00000337425.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000292 AC: 4 AN: 1368638 Hom.: 0 Cov.: 30 AF XY: 0.00000448 AC XY: 3 AN XY: 670056

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: 0.00000376

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

Apr 29, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.802T>C (p.F268L) alteration is located in exon 2 (coding exon 1) of the HYAL3 gene. This alteration results from a T to C substitution at nucleotide position 802, causing the phenylalanine (F) at amino acid position 268 to be replaced by a leucine (L). 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	0.73
BayesDel_addAF	Benign	-0.088	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Benign	0.14	.;T;T;.;.;.
Eigen	Benign	-0.42
Eigen_PC	Benign	-0.18
FATHMM_MKL	Benign	0.64	D
LIST_S2	Benign	0.61	.;.;T;T;T;T
M_CAP	Benign	0.0067	T
MetaRNN	Benign	0.20	T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.88	L;L;L;.;.;L
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-0.64	N;N;.;N;N;N
REVEL	Benign	0.16
Sift	Benign	0.86	T;T;.;T;T;T
Sift4G	Benign	0.64	T;T;T;.;.;T
Polyphen		0.034	B;B;B;B;B;B
Vest4		0.17
MutPred		0.56		Loss of methylation at R269 (P = 0.1238);Loss of methylation at R269 (P = 0.1238);Loss of methylation at R269 (P = 0.1238);.;.;Loss of methylation at R269 (P = 0.1238);
MVP		0.15
MPC		0.46
ClinPred		0.15	T
GERP RS		5.3
Varity_R		0.13
gMVP		0.75

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: rs1701775735; hg19: chr3-50332232;