rs121909487

Positions:

• chr9-126693243-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001174147.2(LMX1B):​c.661C>T​(p.Arg221Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: LMX1B NM_001174147.2 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 2.92

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 9-126693243-C-T is Pathogenic according to our data. Variant chr9-126693243-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 7001.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-126693243-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LMX1B	NM_001174147.2	c.661C>T	p.Arg221Ter	stop_gained	4/8	ENST00000373474.9	NP_001167618.1
LMX1B	NM_001174146.2	c.661C>T	p.Arg221Ter	stop_gained	4/8		NP_001167617.1
LMX1B	NM_002316.4	c.661C>T	p.Arg221Ter	stop_gained	4/8		NP_002307.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LMX1B	ENST00000373474.9	c.661C>T	p.Arg221Ter	stop_gained	4/8	1	NM_001174147.2	ENSP00000362573	P4
LMX1B	ENST00000355497.10	c.661C>T	p.Arg221Ter	stop_gained	4/8	1		ENSP00000347684
LMX1B	ENST00000526117.6	c.661C>T	p.Arg221Ter	stop_gained	4/8	1		ENSP00000436930	A1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1459108 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 725670

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 31, 2023

This sequence change creates a premature translational stop signal (p.Arg221*) in the LMX1B gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in LMX1B are known to be pathogenic (PMID: 9590287, 15498463). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with nail-patella syndrome (PMID: 9590287, 24720768). In at least one individual the variant was observed to be de novo. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 7001). For these reasons, this variant has been classified as Pathogenic. -

Nail-patella syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

May 01, 1998

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	41
DANN	Uncertain	1.0
Eigen	Uncertain	0.64
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Uncertain	0.89	D
MutationTaster	Benign	1.0	A;A;A;A;A
Vest4		0.94
GERP RS		4.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs121909487; hg19: chr9-129455522;