1-225937212-G-A

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_003240.5(LEFTY2):c.*229C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00654 in 638,486 control chromosomes in the GnomAD database, including 135 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.019 (95 hom., cov: 32)
  • Exomes 𝑓: 0.0025 (40 hom.)
• Consequence: LEFTY2 NM_003240.5 3_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.0790

Genes affected

LEFTY2 (HGNC:3122): (left-right determination factor 2) This gene encodes a secreted ligand of the TGF-beta (transforming growth factor-beta) superfamily of proteins. Ligands of this family bind various TGF-beta receptors leading to recruitment and activation of SMAD family transcription factors that regulate gene expression. The encoded preproprotein is proteolytically processed to generate the mature protein, which plays a role in left-right asymmetry determination of organ systems during development. The protein may also play a role in endometrial bleeding. Mutations in this gene have been associated with left-right axis malformations, particularly in the heart and lungs. Some types of infertility have been associated with dysregulated expression of this gene in the endometrium. This gene is closely linked to both a related family member and a related pseudogene. This gene encodes multiple isoforms that may undergo similar proteolytic processing. [provided by RefSeq, Aug 2016]

(HGNC:):

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).
• BP6: Variant 1-225937212-G-A is Benign according to our data. Variant chr1-225937212-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 295966.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0653 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LEFTY2	NM_003240.5	c.*229C>T		3_prime_UTR_variant	4/4	ENST00000366820.10
LEFTY2	NM_001172425.3	c.*229C>T		3_prime_UTR_variant	5/5
LEFTY2	XM_011544266.2	c.*703C>T		3_prime_UTR_variant	4/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LEFTY2	ENST00000366820.10	c.*229C>T		3_prime_UTR_variant	4/4	1	NM_003240.5	P1
	ENST00000513672.1	n.175+171C>T		intron_variant, non_coding_transcript_variant		2
LEFTY2	ENST00000420304.6	c.*229C>T		3_prime_UTR_variant	5/5	2

Frequencies

GnomAD3 genomes AF: 0.0193 AC: 2941 AN: 152090 Hom.: 93 Cov.: 32

Gnomad AFR AF: 0.0674

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00668

Gnomad ASJ AF: 0.000866

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000265

Gnomad OTH AF: 0.0120

GnomAD4 exome AF: 0.00252 AC: 1227 AN: 486278 Hom.: 40 Cov.: 5 AF XY: 0.00211 AC XY: 539 AN XY: 255324

Gnomad4 AFR exome AF: 0.0668

Gnomad4 AMR exome AF: 0.00368

Gnomad4 ASJ exome AF: 0.000426

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000149

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000360

Gnomad4 OTH exome AF: 0.00514

GnomAD4 genome AF: 0.0194 AC: 2946 AN: 152208 Hom.: 95 Cov.: 32 AF XY: 0.0184 AC XY: 1369 AN XY: 74406

Gnomad4 AFR AF: 0.0674

Gnomad4 AMR AF: 0.00667

Gnomad4 ASJ AF: 0.000866

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000265

Gnomad4 OTH AF: 0.0118

Alfa AF: 0.00464 Hom.: 16

Bravo AF: 0.0224

Asia WGS AF: 0.00375 AC: 13 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Left-right axis malformations Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 28, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
Cadd	Benign	1.8
Dann	Benign	0.49

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: rs6662343; hg19: chr1-226124912;