18-36251226-C-T

Position:

• chr18-36251226-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_017947.4(MOCOS):​c.2107C>T​(p.His703Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict 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. H703N) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MOCOS NM_017947.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.58

Genes affected

MOCOS (HGNC:18234): (molybdenum cofactor sulfurase) This gene encodes an enzyme that sulfurates the molybdenum cofactor which is required for activation of the xanthine dehydrogenase (XDH) and aldehyde oxidase (AO) enzymes. XDH catalyzes the conversion of hypoxanthine to uric acid via xanthine, as well as the conversion of allopurinol to oxypurinol, and pyrazinamide to 5-hydroxy pyrazinamide. Mutations in this gene cause the metabolic disorder classical xanthinuria type II which is characterized by the loss of XDH/XO and AO enzyme activity, decreased levels of uric acid in the urine, increased levels of xanthine and hypoxanthine in the serum and urine, formation of xanthine stones in the urinary tract, and myositis due to tissue deposition of xanthine. [provided by RefSeq, Apr 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2408596).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MOCOS	NM_017947.4	c.2107C>T	p.His703Tyr	missense_variant	11/15	ENST00000261326.6	NP_060417.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MOCOS	ENST00000261326.6	c.2107C>T	p.His703Tyr	missense_variant	11/15	1	NM_017947.4	ENSP00000261326.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.079
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.076	T
Eigen	Benign	0.099
Eigen_PC	Benign	0.20
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.66	T
M_CAP	Benign	0.0070	T
MetaRNN	Benign	0.24	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	2.0	M
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-2.3	N
REVEL	Benign	0.10
Sift	Uncertain	0.023	D
Sift4G	Uncertain	0.0090	D
Polyphen		0.58	P
Vest4		0.16
MutPred		0.54		Loss of disorder (P = 0.052);
MVP		0.37
MPC		0.21
ClinPred		0.83	D
GERP RS		5.5
Varity_R		0.32
gMVP		0.31

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

Publications

LitVar

Other links and lift over

dbSNP: rs594445; hg19: chr18-33831189;