chr9-136196807-C-T

Position:

• chr9-136196807-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BS1_Supporting

The NM_178138.6(LHX3):​c.*518G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0015 in 157,738 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0015 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0018 (0 hom.)
• Consequence: LHX3 NM_178138.6 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.56

Genes affected

LHX3 (HGNC:6595): (LIM homeobox 3) This gene encodes a member of a large family of proteins which carry the LIM domain, a unique cysteine-rich zinc-binding domain. The encoded protein is a transcription factor that is required for pituitary development and motor neuron specification. Mutations in this gene cause combined pituitary hormone deficiency 3. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Dec 2015]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00149 (226/152186) while in subpopulation NFE AF= 0.00225 (153/68004). AF 95% confidence interval is 0.00196. There are 0 homozygotes in gnomad4. There are 114 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LHX3	NM_178138.6	c.*518G>A		3_prime_UTR_variant	6/6	ENST00000371748.10
LHX3	NM_001363746.1	c.*518G>A		3_prime_UTR_variant	6/6
LHX3	NM_014564.5	c.*518G>A		3_prime_UTR_variant	6/6
LHX3	XM_017015168.1	c.*518G>A		3_prime_UTR_variant	6/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LHX3	ENST00000371748.10	c.*518G>A		3_prime_UTR_variant	6/6	1	NM_178138.6
LHX3	ENST00000371746.9	c.*518G>A		3_prime_UTR_variant	6/6	1		P1
LHX3	ENST00000619587.1	c.*518G>A		3_prime_UTR_variant	6/6	1
LHX3	ENST00000645419.1	n.2537G>A		non_coding_transcript_exon_variant	5/5

Frequencies

GnomAD3 genomes AF: 0.00149 AC: 226 AN: 152066 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000435

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000982

Gnomad ASJ AF: 0.00202

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00273

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00225

Gnomad OTH AF: 0.00144

GnomAD4 exome AF: 0.00180 AC: 10 AN: 5552 Hom.: 0 Cov.: 0 AF XY: 0.00284 AC XY: 8 AN XY: 2818

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00268

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00340

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00190

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00149 AC: 226 AN: 152186 Hom.: 0 Cov.: 33 AF XY: 0.00153 AC XY: 114 AN XY: 74414

Gnomad4 AFR AF: 0.000434

Gnomad4 AMR AF: 0.000981

Gnomad4 ASJ AF: 0.00202

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00273

Gnomad4 NFE AF: 0.00225

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.000584 Hom.: 0

Bravo AF: 0.00132

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Non-acquired combined pituitary hormone deficiency with spine abnormalities Uncertain: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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	0.93
DANN	Benign	0.79

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: rs545939943; hg19: chr9-139088653; COSMIC: COSV65581993;