chr9-126614579-G-A

Position:

• chr9-126614579-G-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BS1_Supporting BS2

The NM_001174147.2(LMX1B):​c.130G>A​(p.Val44Met) variant causes a missense change. The variant allele was found at a frequency of 0.00000814 in 1,597,896 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000066 (0 hom., cov: 30)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: LMX1B NM_001174147.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.46

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_benign. Variant got -5 ACMG points.

• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.0000657 (10/152118) while in subpopulation AMR AF= 0.000523 (8/15286). AF 95% confidence interval is 0.00026. There are 0 homozygotes in gnomad4. There are 5 alleles in male gnomad4 subpopulation. Median coverage is 30. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High AC in GnomAd4 at 10 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LMX1B	NM_001174147.2	c.130G>A	p.Val44Met	missense_variant	1/8	ENST00000373474.9	NP_001167618.1
LMX1B	NM_001174146.2	c.130G>A	p.Val44Met	missense_variant	1/8		NP_001167617.1
LMX1B	NM_002316.4	c.130G>A	p.Val44Met	missense_variant	1/8		NP_002307.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LMX1B	ENST00000373474.9	c.130G>A	p.Val44Met	missense_variant	1/8	1	NM_001174147.2	ENSP00000362573	P4
LMX1B	ENST00000355497.10	c.130G>A	p.Val44Met	missense_variant	1/8	1		ENSP00000347684
LMX1B	ENST00000526117.6	c.130G>A	p.Val44Met	missense_variant	1/8	1		ENSP00000436930	A1

Frequencies

GnomAD3 genomes AF: 0.0000657 AC: 10 AN: 152118 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000523

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.000478

GnomAD4 exome AF: 0.00000208 AC: 3 AN: 1445778 Hom.: 0 Cov.: 30 AF XY: 0.00000139 AC XY: 1 AN XY: 718328

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000231

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: 0.0000335

GnomAD4 genome AF: 0.0000657 AC: 10 AN: 152118 Hom.: 0 Cov.: 30 AF XY: 0.0000673 AC XY: 5 AN XY: 74298

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.000523

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.000478

Bravo AF: 0.000140

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

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

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 16, 2022

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 25, 2024

This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 44 of the LMX1B protein (p.Val44Met). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with LMX1B-related conditions. ClinVar contains an entry for this variant (Variation ID: 1027208). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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	Benign	0.17
BayesDel_addAF	Uncertain	0.057	T
BayesDel_noAF	Benign	-0.16
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.30	.;T;.;T
Eigen	Benign	0.15
Eigen_PC	Benign	0.20
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.92	D;D;D;D
M_CAP	Pathogenic	0.75	D
MetaRNN	Uncertain	0.55	D;D;D;D
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Benign	1.5	L;L;L;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.95	D
PROVEAN	Benign	-0.020	N;N;N;N
REVEL	Uncertain	0.40
Sift	Benign	0.10	T;T;T;T
Sift4G	Benign	0.22	T;T;T;T
Polyphen		0.91	.;.;.;P
Vest4		0.49
MVP		0.60
MPC		1.6
ClinPred		0.83	D
GERP RS		3.6
Varity_R		0.22
gMVP		0.58

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: rs1017526258; hg19: chr9-129376858;