19-51713524-G-C

Variant names:

• chr19-51713524-G-C
• rs375056321
• NM_001297436.2:c.1637C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001297436.2(HAS1):​c.1637C>G​(p.Ala546Gly) variant causes a missense change. The variant allele was found at a frequency of 0.00000345 in 1,449,788 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. A546D) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: HAS1 NM_001297436.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.53
• 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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.35612667).

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.1637C>G	p.Ala546Gly	missense	Exon 5 of 5	NP_001284365.1	G3V1S7
	HAS1	NM_001523.4		c.1640C>G	p.Ala547Gly	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.1637C>G	p.Ala546Gly	missense	Exon 5 of 5	ENSP00000445021.2	G3V1S7
	HAS1	ENST00000601714.5	TSL:1	c.1661C>G	p.Ala554Gly	missense	Exon 4 of 4	ENSP00000472821.1	M0R2V0
	HAS1	ENST00000222115.5	TSL:1	c.1640C>G	p.Ala547Gly	missense	Exon 5 of 5	ENSP00000222115.1	Q92839

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000345 AC: 5 AN: 1449788 Hom.: 0 Cov.: 32 AF XY: 0.00000278 AC XY: 2 AN XY: 720594

African (AFR) AF: 0.00 AC: 0 AN: 33144

American (AMR) AF: 0.00 AC: 0 AN: 43880

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25906

East Asian (EAS) AF: 0.00 AC: 0 AN: 39158

South Asian (SAS) AF: 0.00 AC: 0 AN: 85204

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49736

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5754

European-Non Finnish (NFE) AF: 0.00000452 AC: 5 AN: 1107168

Other (OTH) AF: 0.00 AC: 0 AN: 59838

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.46
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.23	T
Eigen	Benign	0.037
Eigen_PC	Benign	0.022
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.59	T
M_CAP	Uncertain	0.17	D
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.2	L
PhyloP100		5.5
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-2.0	N
REVEL	Benign	0.094
Sift	Benign	0.17	T
Sift4G	Benign	0.22	T
Polyphen		0.98	D
Vest4		0.28
MutPred		0.26		Loss of helix (P = 0.0558)
MVP		0.54
MPC		0.26
ClinPred		0.91	D
GERP RS		3.3
Varity_R		0.16
gMVP		0.28
Mutation Taster		=50/50

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: rs375056321; hg19: chr19-52216777;