19-51713677-A-G

Variant names:

• chr19-51713677-A-G
• rs899233860
• NM_001297436.2:c.1484T>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001297436.2(HAS1):​c.1484T>C​(p.Leu495Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000767 in 1,434,134 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L495Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000077 (0 hom.)
• Consequence: HAS1 NM_001297436.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.93
• Publications: 0 publications found

Genes affected

HAS1 (HGNC:4818): (hyaluronan synthase 1) Hyaluronan or hyaluronic acid (HA) is a high molecular weight unbranched polysaccharide synthesized by a wide variety of organisms from bacteria to mammals, and is a constituent of the extracellular matrix. It consists of alternating glucuronic acid and N-acetylglucosamine residues that are linked by beta-1-3 and beta-1-4 glycosidic bonds. HA is synthesized by membrane-bound synthase at the inner surface of the plasma membrane, and the chains are extruded through pore-like structures into the extracellular space. It serves a variety of functions, including space filling, lubrication of joints, and provision of a matrix through which cells can migrate. HA is actively produced during wound healing and tissue repair to provide a framework for ingrowth of blood vessels and fibroblasts. Changes in the serum concentration of HA are associated with inflammatory and degenerative arthropathies such as rheumatoid arthritis. In addition, the interaction of HA with the leukocyte receptor CD44 is important in tissue-specific homing by leukocytes, and overexpression of HA receptors has been correlated with tumor metastasis. HAS1 is a member of the newly identified vertebrate gene family encoding putative hyaluronan synthases, and its amino acid sequence shows significant homology to the hasA gene product of Streptococcus pyogenes, a glycosaminoglycan synthetase (DG42) from Xenopus laevis, and a recently described murine hyaluronan synthase. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2014]

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001297436.2. 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
	HAS1	NM_001297436.2	MANE Select	c.1484T>C	p.Leu495Pro	missense	Exon 5 of 5	NP_001284365.1	G3V1S7
	HAS1	NM_001523.4		c.1487T>C	p.Leu496Pro	missense	Exon 5 of 5	NP_001514.2	Q92839

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HAS1	ENST00000540069.7	TSL:1 MANE Select	c.1484T>C	p.Leu495Pro	missense	Exon 5 of 5	ENSP00000445021.2	G3V1S7
	HAS1	ENST00000601714.5	TSL:1	c.1508T>C	p.Leu503Pro	missense	Exon 4 of 4	ENSP00000472821.1	M0R2V0
	HAS1	ENST00000222115.5	TSL:1	c.1487T>C	p.Leu496Pro	missense	Exon 5 of 5	ENSP00000222115.1	Q92839

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000767 AC: 11 AN: 1434134 Hom.: 0 Cov.: 33 AF XY: 0.00000843 AC XY: 6 AN XY: 711626

African (AFR) AF: 0.00 AC: 0 AN: 32742

American (AMR) AF: 0.00 AC: 0 AN: 40634

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25602

East Asian (EAS) AF: 0.00 AC: 0 AN: 37964

South Asian (SAS) AF: 0.00 AC: 0 AN: 83190

European-Finnish (FIN) AF: 0.0000203 AC: 1 AN: 49292

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5620

European-Non Finnish (NFE) AF: 0.00000909 AC: 10 AN: 1099836

Other (OTH) AF: 0.00 AC: 0 AN: 59254

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.059	T
BayesDel_noAF	Benign	-0.15
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.58	D
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.34
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.90	D
M_CAP	Uncertain	0.23	D
MetaRNN	Uncertain	0.43	T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	1.0	L
PhyloP100		8.9
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-3.6	D
REVEL	Uncertain	0.32
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0060	D
Polyphen		0.99	D
Vest4		0.39
MutPred		0.62		Gain of sheet (P = 0.0028)
MVP		0.50
MPC		0.45
ClinPred		0.99	D
GERP RS		3.3
Varity_R		0.54
gMVP		0.62
Mutation Taster		=44/56	disease causing

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

Other links and lift over

dbSNP: rs899233860; hg19: chr19-52216930; COSMIC: COSV99708231; COSMIC: COSV99708231;