chr16-88837703-G-T

Variant names:

• chr16-88837703-G-T
• rs118204444
• NM_000512.5:c.485C>A

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1 PM2 PM5 PP3 PP5_Moderate

The NM_000512.5(GALNS):​c.485C>A​(p.Ser162Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S162F) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GALNS NM_000512.5 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.60
• Publications: 0 publications found

Genes affected

GALNS (HGNC:4122): (galactosamine (N-acetyl)-6-sulfatase) This gene encodes N-acetylgalactosamine-6-sulfatase which is a lysosomal exohydrolase required for the degradation of the glycosaminoglycans, keratan sulfate, and chondroitin 6-sulfate. Sequence alterations including point, missense and nonsense mutations, as well as those that affect splicing, result in a deficiency of this enzyme. Deficiencies of this enzyme lead to Morquio A syndrome, a lysosomal storage disorder. [provided by RefSeq, Jul 2008]

GALNS Gene-Disease associations (from GenCC):

• mucopolysaccharidosis type 4A

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM1: In a hotspot region, there are 10 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 11 uncertain in NM_000512.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr16-88837703-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 709.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.765
• PP5: Variant 16-88837703-G-T is Pathogenic according to our data. Variant chr16-88837703-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 2118605.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000512.5. 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
	GALNS	NM_000512.5	MANE Select	c.485C>A	p.Ser162Tyr	missense	Exon 5 of 14	NP_000503.1	P34059
	GALNS	NM_001323544.2		c.503C>A	p.Ser168Tyr	missense	Exon 6 of 15	NP_001310473.1
	GALNS	NM_001323543.2		c.-71C>A		5_prime_UTR	Exon 4 of 13	NP_001310472.1	Q6YL38

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GALNS	ENST00000268695.10	TSL:1 MANE Select	c.485C>A	p.Ser162Tyr	missense	Exon 5 of 14	ENSP00000268695.5	P34059
	GALNS	ENST00000562593.5	TSL:1	n.3894C>A		non_coding_transcript_exon	Exon 3 of 12
	GALNS	ENST00000862787.1		c.596C>A	p.Ser199Tyr	missense	Exon 6 of 15	ENSP00000532846.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Mucopolysaccharidosis, MPS-IV-A (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.86
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	28
DANN	Benign	0.97
DEOGEN2	Uncertain	0.71	D
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.43	D
MetaRNN	Pathogenic	0.77	D
MetaSVM	Uncertain	0.27	D
MutationAssessor	Benign	0.29	N
PhyloP100		9.6
PrimateAI	Uncertain	0.63	T
PROVEAN	Benign	-2.0	N
REVEL	Pathogenic	0.71
Sift	Benign	0.79	T
Sift4G	Benign	1.0	T
Polyphen		1.0	D
Vest4		0.70
MutPred		0.73		Gain of sheet (P = 0.0477)
MVP		1.0
MPC		0.56
ClinPred		0.96	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.80
gMVP		0.92
Mutation Taster		=6/94	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: rs118204444; hg19: chr16-88904111;