rs121965021

Variant names:

• chr4-1003418-C-A
• rs121965021
• NM_000203.5:c.1598C>A

Your query was ambiguous. Multiple possible variants found:

• chr4-1003418-C-A
• chr4-1003418-C-G
• chr4-1003418-C-T

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PM5 PP3_Moderate PP5

The NM_000203.5(IDUA):​c.1598C>A​(p.Pro533Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000726 in 1,376,970 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P533S) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: IDUA NM_000203.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 2.91
• Publications: 0 publications found

Genes affected

IDUA (HGNC:5391): (alpha-L-iduronidase) This gene encodes an enzyme that hydrolyzes the terminal alpha-L-iduronic acid residues of two glycosaminoglycans, dermatan sulfate and heparan sulfate. This hydrolysis is required for the lysosomal degradation of these glycosaminoglycans. Mutations in this gene that result in enzymatic deficiency lead to the autosomal recessive disease mucopolysaccharidosis type I (MPS I). [provided by RefSeq, Jul 2008]

IDUA Gene-Disease associations (from GenCC):

• mucopolysaccharidosis type 1

  Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health, ClinGen
• Scheie syndrome

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

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp
• Hurler-Scheie syndrome

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr4-1003417-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 2201882.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.904
• PP5: Variant 4-1003418-C-A is Pathogenic according to our data. Variant chr4-1003418-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 1970157.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000203.5. 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
	IDUA	NM_000203.5	MANE Select	c.1598C>A	p.Pro533Gln	missense	Exon 11 of 14	NP_000194.2	P35475-1
	IDUA	NM_001363576.1		c.1202C>A	p.Pro401Gln	missense	Exon 10 of 13	NP_001350505.1
	IDUA	NR_110313.1		n.1686C>A		non_coding_transcript_exon	Exon 11 of 14

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IDUA	ENST00000514224.2	TSL:2 MANE Select	c.1598C>A	p.Pro533Gln	missense	Exon 11 of 14	ENSP00000425081.2	P35475-1
	IDUA	ENST00000247933.9	TSL:1	c.1598C>A	p.Pro533Gln	missense	Exon 11 of 14	ENSP00000247933.4	P35475-1
	IDUA	ENST00000962389.1		c.1673C>A	p.Pro558Gln	missense	Exon 12 of 15	ENSP00000632448.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.26e-7 AC: 1 AN: 1376970 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 679424

African (AFR) AF: 0.00 AC: 0 AN: 30626

American (AMR) AF: 0.00 AC: 0 AN: 35348

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24912

East Asian (EAS) AF: 0.00 AC: 0 AN: 35058

South Asian (SAS) AF: 0.00 AC: 0 AN: 78766

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33516

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4602

European-Non Finnish (NFE) AF: 9.29e-7 AC: 1 AN: 1076680

Other (OTH) AF: 0.00 AC: 0 AN: 57462

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
1	-	-	Mucopolysaccharidosis type 1 (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.84	D
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.78	T
M_CAP	Pathogenic	0.87	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Pathogenic	0.83	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		2.9
PrimateAI	Pathogenic	0.85	D
PROVEAN	Pathogenic	-6.5	D
REVEL	Pathogenic	0.67
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0030	D
Polyphen		1.0	D
Vest4		0.53
MVP		0.98
MPC		0.73
ClinPred		0.99	D
GERP RS		4.3
Varity_R		0.88
gMVP		0.91
Mutation Taster		=3/97	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		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: rs121965021; hg19: chr4-997206;