chr9-126690862-G-A

Position:

• chr9-126690862-G-A

Variant summary

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

The NM_001174147.2(LMX1B):​c.353G>A​(p.Cys118Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C118F) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 34)
• Consequence: LMX1B NM_001174147.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:2
• Conservation: PhyloP100: 9.95

Genes affected

LMX1B (HGNC:6654): (LIM homeobox transcription factor 1 beta) This gene encodes a member of LIM-homeodomain family of proteins containing two N-terminal zinc-binding LIM domains, 1 homeodomain, and a C-terminal glutamine-rich domain. It functions as a transcription factor, and is essential for the normal development of dorsal limb structures, the glomerular basement membrane, the anterior segment of the eye, and dopaminergic and serotonergic neurons. Mutations in this gene are associated with nail-patella syndrome. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 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 chr9-126690862-G-T is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.987
• PP5: Variant 9-126690862-G-A is Pathogenic according to our data. Variant chr9-126690862-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 995576.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}. Variant chr9-126690862-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LMX1B	NM_001174147.2	c.353G>A	p.Cys118Tyr	missense_variant	3/8	ENST00000373474.9	NP_001167618.1
LMX1B	NM_001174146.2	c.353G>A	p.Cys118Tyr	missense_variant	3/8		NP_001167617.1
LMX1B	NM_002316.4	c.353G>A	p.Cys118Tyr	missense_variant	3/8		NP_002307.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LMX1B	ENST00000373474.9	c.353G>A	p.Cys118Tyr	missense_variant	3/8	1	NM_001174147.2	ENSP00000362573.3
LMX1B	ENST00000355497.10	c.353G>A	p.Cys118Tyr	missense_variant	3/8	1		ENSP00000347684.5
LMX1B	ENST00000526117.6	c.353G>A	p.Cys118Tyr	missense_variant	3/8	1		ENSP00000436930.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 34

Alfa AF: 0.0000455 Hom.: 0

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Nail-patella syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Molecular Diagnostics Laboratory, M Health Fairview: University of Minnesota

Nov 18, 2020

- -

Nail-patella syndrome;C0403548:Nail-patella-like renal disease Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

May 25, 2024

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 25, 2023

This sequence change replaces cysteine, which is neutral and slightly polar, with tyrosine, which is neutral and polar, at codon 118 of the LMX1B protein (p.Cys118Tyr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with nail-patella syndrome (PMID: 10571942). This variant is also known as C95Y. ClinVar contains an entry for this variant (Variation ID: 995576). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt LMX1B protein function with a positive predictive value of 80%. This variant disrupts the p.Cys118 amino acid residue in LMX1B. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 9618165). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	34
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	.;D;.;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.95
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D;D;D;D
M_CAP	Pathogenic	0.92	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	0.95	D
MutationAssessor	Pathogenic	5.0	H;H;H;.
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-10	D;D;D;D
REVEL	Pathogenic	0.95
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	.;.;.;D
Vest4		0.99
MVP		0.98
MPC		2.3
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.99
gMVP		0.99

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: rs121909488; hg19: chr9-129453141;