chr3-190410026-C-A

Position:

• chr3-190410026-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The NM_006580.4(CLDN16):​c.698C>A​(p.Thr233Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000684 in 1,461,844 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: CLDN16 NM_006580.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.75

Genes affected

CLDN16 (HGNC:2037): (claudin 16) Tight junctions represent one mode of cell-to-cell adhesion in epithelial or endothelial cell sheets, forming continuous seals around cells and serving as a physical barrier to prevent solutes and water from passing freely through the paracellular space. These junctions are comprised of sets of continuous networking strands in the outwardly facing cytoplasmic leaflet, with complementary grooves in the inwardly facing extracytoplasmic leaflet. The protein encoded by this gene, a member of the claudin family, is an integral membrane protein and a component of tight junction strands. It is found primarily in the kidneys, specifically in the thick ascending limb of Henle, where it acts as either an intercellular pore or ion concentration sensor to regulate the paracellular resorption of magnesium ions. Defects in this gene are a cause of primary hypomagnesemia, which is characterized by massive renal magnesium wasting with hypomagnesemia and hypercalciuria, resulting in nephrocalcinosis and renal failure. This gene and the CLDN1 gene are clustered on chromosome 3q28. [provided by RefSeq, Jun 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a chain Claudin-16 (size 234) in uniprot entity CLD16_HUMAN there are 9 pathogenic changes around while only 1 benign (90%) in NM_006580.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.825

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CLDN16	NM_006580.4	c.698C>A	p.Thr233Lys	missense_variant	5/5	ENST00000264734.3	NP_006571.2
CLDN16	NM_001378492.1	c.698C>A	p.Thr233Lys	missense_variant	9/9		NP_001365421.1
CLDN16	NM_001378493.1	c.698C>A	p.Thr233Lys	missense_variant	8/8		NP_001365422.1
CLDN16	XM_047447333.1	c.698C>A	p.Thr233Lys	missense_variant	7/7		XP_047303289.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CLDN16	ENST00000264734.3	c.698C>A	p.Thr233Lys	missense_variant	5/5	1	NM_006580.4	ENSP00000264734.3
CLDN16	ENST00000456423.2	c.*88C>A		downstream_gene_variant		1		ENSP00000414136.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461844 Hom.: 0 Cov.: 31 AF XY: 0.00000963 AC XY: 7 AN XY: 727216

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: 0.00000899

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000370 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 15, 2022

The c.908C>A (p.T303K) alteration is located in exon 5 (coding exon 5) of the CLDN16 gene. This alteration results from a C to A substitution at nucleotide position 908, causing the threonine (T) at amino acid position 303 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.54
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.34
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.22	T
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.83	T
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.82	D
MetaSVM	Pathogenic	0.80	D
MutationAssessor	Uncertain	2.5	M
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.2	N
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0090	D
Polyphen		1.0	D
Vest4		0.77
MVP		0.98
MPC		0.55
ClinPred		0.97	D
GERP RS		5.7
Varity_R		0.49
gMVP		0.66

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs121908542; hg19: chr3-190127815;