1-42738540-A-G

Position:

• chr1-42738540-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2 PM5 PP3_Strong PP5

The NM_148960.3(CLDN19):​c.269T>C​(p.Leu90Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,626 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L90R) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CLDN19 NM_148960.3 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 9.32

Genes affected

CLDN19 (HGNC:2040): (claudin 19) The product of this gene belongs to the claudin family. It plays a major role in tight junction-specific obliteration of the intercellular space, through calcium-independent cell-adhesion activity. Defects in this gene are the cause of hypomagnesemia renal with ocular involvement (HOMGO). HOMGO is a progressive renal disease characterized by primary renal magnesium wasting with hypomagnesemia, hypercalciuria and nephrocalcinosis associated with severe ocular abnormalities such as bilateral chorioretinal scars, macular colobomata, significant myopia and nystagmus. Alternatively spliced transcript variants encoding distinct isoforms have been identified for this gene. [provided by RefSeq, Jun 2010]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-42738540-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 548636.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.945
• PP5: Variant 1-42738540-A-G is Pathogenic according to our data. Variant chr1-42738540-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 1363.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLDN19	NM_148960.3	c.269T>C	p.Leu90Pro	missense_variant	2/5	ENST00000296387.6
CLDN19	NM_001185117.2	c.269T>C	p.Leu90Pro	missense_variant	2/3
CLDN19	NM_001123395.2	c.269T>C	p.Leu90Pro	missense_variant	2/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLDN19	ENST00000296387.6	c.269T>C	p.Leu90Pro	missense_variant	2/5	2	NM_148960.3
CLDN19	ENST00000372539.3	c.269T>C	p.Leu90Pro	missense_variant	2/4	1		P1
CLDN19	ENST00000539749.5	c.269T>C	p.Leu90Pro	missense_variant	2/3	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461626 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727142

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Renal hypomagnesemia 5 with ocular involvement Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Nov 01, 2006

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.50	D
BayesDel_noAF	Pathogenic	0.49
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.87	D;.;.
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.91	D;D;D
M_CAP	Pathogenic	0.55	D
MetaRNN	Pathogenic	0.95	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.5	M;M;M
MutationTaster	Benign	1.0	A;A;A
PrimateAI	Pathogenic	0.81	D
PROVEAN	Pathogenic	-5.8	D;D;D
REVEL	Pathogenic	0.96
Sift	Uncertain	0.0010	D;D;D
Sift4G	Uncertain	0.0020	D;D;D
Polyphen		1.0	D;.;D
Vest4		0.96
MutPred		0.80		Loss of stability (P = 0.0255);Loss of stability (P = 0.0255);Loss of stability (P = 0.0255);
MVP		0.98
MPC		1.3
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.98
gMVP		0.95

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: rs118203981; hg19: chr1-43204211; COSMIC: COSV56417463;