chr16-20335483-C-A

Variant names:

• chr16-20335483-C-A
• rs985621780
• NM_003361.4:c.1860G>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_003361.4(UMOD):​c.1860G>T​(p.Leu620Phe) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,818 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/24 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: UMOD NM_003361.4 missense, splice_region
• Scores: Splicing: ADA: 0.00005611
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.109
• Publications: 0 publications found

Genes affected

UMOD (HGNC:12559): (uromodulin) The protein encoded by this gene is the most abundant protein in mammalian urine under physiological conditions. Its excretion in urine follows proteolytic cleavage of the ectodomain of its glycosyl phosphatidylinosital-anchored counterpart that is situated on the luminal cell surface of the loop of Henle. This protein may act as a constitutive inhibitor of calcium crystallization in renal fluids. Excretion of this protein in urine may provide defense against urinary tract infections caused by uropathogenic bacteria. Defects in this gene are associated with the renal disorders medullary cystic kidney disease-2 (MCKD2), glomerulocystic kidney disease with hyperuricemia and isosthenuria (GCKDHI), and familial juvenile hyperuricemic nephropathy (FJHN). Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, Jul 2013]

UMOD Gene-Disease associations (from GenCC):

• autosomal dominant medullary cystic kidney disease with or without hyperuricemia

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• glomerulocystic kidney disease with hyperuricemia and isosthenuria

  Inheritance: AD Classification: DEFINITIVE Submitted by: Laboratory for Molecular Medicine
• familial juvenile hyperuricemic nephropathy type 1

  Inheritance: AD, Unknown Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• autosomal dominant medullary cystic kidney disease with hyperuricemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 69 curated pathogenic missense variants (we use a threshold of 10). The gene has 14 curated benign missense variants. Gene score misZ: 0.99836 (below the threshold of 3.09). Trascript score misZ: 0.48416 (below the threshold of 3.09). GenCC associations: The gene is linked to autosomal dominant medullary cystic kidney disease with or without hyperuricemia, familial juvenile hyperuricemic nephropathy type 1, glomerulocystic kidney disease with hyperuricemia and isosthenuria, autosomal dominant medullary cystic kidney disease with hyperuricemia.
• BP4: Computational evidence support a benign effect (MetaRNN=0.15142441).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003361.4. 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
	UMOD	NM_003361.4	MANE Select	c.1860G>T	p.Leu620Phe	missense splice_region	Exon 10 of 11	NP_003352.2	P07911-1
	UMOD	NM_001378234.1		c.2001G>T	p.Leu667Phe	missense splice_region	Exon 11 of 12	NP_001365163.1
	UMOD	NM_001378235.1		c.2001G>T	p.Leu667Phe	missense splice_region	Exon 11 of 12	NP_001365164.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UMOD	ENST00000396138.9	TSL:5 MANE Select	c.1860G>T	p.Leu620Phe	missense splice_region	Exon 10 of 11	ENSP00000379442.5	P07911-1
	UMOD	ENST00000396134.6	TSL:2	c.1959G>T	p.Leu653Phe	missense splice_region	Exon 11 of 12	ENSP00000379438.2	P07911-5
	UMOD	ENST00000863077.1		c.2022G>T	p.Leu674Phe	missense splice_region	Exon 11 of 12	ENSP00000533136.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461818 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727200

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.0000232 AC: 2 AN: 86238

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111964

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.071	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	12
DANN	Uncertain	0.99
Eigen	Benign	-0.50
Eigen_PC	Benign	-0.65
FATHMM_MKL	Benign	0.037	N
LIST_S2	Benign	0.72	T
M_CAP	Benign	0.032	D
MetaRNN	Benign	0.15	T
MetaSVM	Benign	-0.65	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		0.11
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.21
Sift	Uncertain	0.015	D
Sift4G	Uncertain	0.044	D
Polyphen		0.74	P
Vest4		0.21
MutPred		0.38		Loss of helix (P = 0.0376)
MVP		0.48
MPC		0.11
ClinPred		0.59	D
GERP RS		-1.0
Varity_R		0.12
gMVP		0.24
Mutation Taster		=92/8	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000056
dbscSNV1_RF	Benign	0.036
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

Other links and lift over

dbSNP: rs985621780; hg19: chr16-20346805;