chr4-1002767-G-T

Variant names:

• chr4-1002767-G-T
• NM_000203.5:c.1225G>T

Variant summary

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

The NM_000203.5(IDUA):​c.1225G>T​(p.Gly409Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000752 in 1,330,556 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. G409R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.5e-7 (0 hom.)
• Consequence: IDUA NM_000203.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.768

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IDUA	NM_000203.5	c.1225G>T	p.Gly409Trp	missense_variant	Exon 9 of 14	ENST00000514224.2	NP_000194.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IDUA	ENST00000514224.2	c.1225G>T	p.Gly409Trp	missense_variant	Exon 9 of 14	2	NM_000203.5	ENSP00000425081.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.52e-7 AC: 1 AN: 1330556 Hom.: 0 Cov.: 34 AF XY: 0.00000152 AC XY: 1 AN XY: 655768

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: 9.48e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.34
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.89	D;.
Eigen	Benign	-0.17
Eigen_PC	Benign	-0.30
FATHMM_MKL	Benign	0.32	N
LIST_S2	Benign	0.76	T;.
M_CAP	Pathogenic	0.87	D
MetaRNN	Uncertain	0.51	D;D
MetaSVM	Uncertain	0.27	D
MutationAssessor	Uncertain	2.3	M;.
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-3.9	D;D
REVEL	Uncertain	0.45
Sift	Uncertain	0.0030	D;D
Sift4G	Uncertain	0.012	D;D
Polyphen		1.0	D;.
Vest4		0.43
MVP		0.98
MPC		0.82
ClinPred		0.93	D
GERP RS		2.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.34
gMVP		0.61

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr4-996555;