chr18-46507541-G-A

Position:

• chr18-46507541-G-A

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6 BP7 BS2

The NM_001384474.1(LOXHD1):​c.5689C>T​(p.Leu1897=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0024 in 1,551,712 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0021 (1 hom., cov: 33)
  • Exomes 𝑓: 0.0024 (3 hom.)
• Consequence: LOXHD1 NM_001384474.1 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:10
• Conservation: PhyloP100: -0.219

Genes affected

LOXHD1 (HGNC:26521): (lipoxygenase homology PLAT domains 1) This gene encodes a highly conserved protein consisting entirely of PLAT (polycystin/lipoxygenase/alpha-toxin) domains, thought to be involved in targeting proteins to the plasma membrane. Studies in mice show that this gene is expressed in the mechanosensory hair cells in the inner ear, and mutations in this gene lead to auditory defects, indicating that this gene is essential for normal hair cell function. Screening of human families segregating deafness identified a mutation in this gene which causes DFNB77, a progressive form of autosomal-recessive nonsyndromic hearing loss (ARNSHL). Alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Mar 2010]

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.65).
• BP6: Variant 18-46507541-G-A is Benign according to our data. Variant chr18-46507541-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 163895.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=4, Uncertain_significance=1}. Variant chr18-46507541-G-A is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-0.219 with no splicing effect.
• BS2: High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LOXHD1	NM_001384474.1	c.5689C>T	p.Leu1897=	synonymous_variant	36/41	ENST00000642948.1	NP_001371403.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LOXHD1	ENST00000642948.1	c.5689C>T	p.Leu1897=	synonymous_variant	36/41		NM_001384474.1	ENSP00000496347	P1

Frequencies

GnomAD3 genomes AF: 0.00208 AC: 317 AN: 152230 Hom.: 1 Cov.: 33

Gnomad AFR AF: 0.000265

Gnomad AMI AF: 0.00110

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.000289

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00866

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00301

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.00214 AC: 335 AN: 156364 Hom.: 1 AF XY: 0.00212 AC XY: 176 AN XY: 82884

Gnomad AFR exome AF: 0.000505

Gnomad AMR exome AF: 0.000446

Gnomad ASJ exome AF: 0.000118

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00755

Gnomad NFE exome AF: 0.00301

Gnomad OTH exome AF: 0.00228

GnomAD4 exome AF: 0.00244 AC: 3408 AN: 1399364 Hom.: 3 Cov.: 31 AF XY: 0.00238 AC XY: 1640 AN XY: 690196

Gnomad4 AFR exome AF: 0.000475

Gnomad4 AMR exome AF: 0.000588

Gnomad4 ASJ exome AF: 0.000119

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000126

Gnomad4 FIN exome AF: 0.00850

Gnomad4 NFE exome AF: 0.00263

Gnomad4 OTH exome AF: 0.00188

GnomAD4 genome AF: 0.00208 AC: 317 AN: 152348 Hom.: 1 Cov.: 33 AF XY: 0.00235 AC XY: 175 AN XY: 74512

Gnomad4 AFR AF: 0.000265

Gnomad4 AMR AF: 0.000261

Gnomad4 ASJ AF: 0.000289

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00866

Gnomad4 NFE AF: 0.00301

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00259 Hom.: 0

Bravo AF: 0.00144

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:10

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Benign:5

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Sep 20, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jul 02, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jul 01, 2023	LOXHD1: BP4, BP7 -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	May 05, 2015	Leu1835Leu in Exon 35 of LOXHD1: This variant is not expected to have clinical s ignificance because it does not alter an amino acid residue, is not located with in the splice consensus sequence, and has been identified in 1.1% (17/1524) of E uropean chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broad institute.org; dbSNP rs202043044). -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jul 17, 2017	- -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -

Autosomal recessive nonsyndromic hearing loss 77 Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Nov 11, 2019	- -

LOXHD1-related disorder Benign:1

Benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 17, 2021

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.65
CADD	Benign	2.3
DANN	Benign	0.61

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: rs202043044; hg19: chr18-44087504;