15-76340516-T-C

Variant names:

• chr15-76340516-T-C
• rs2040185590
• NM_145805.3:c.752T>C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_145805.3(ISL2):​c.752T>C​(p.Ile251Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,636 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ISL2 NM_145805.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.92

Genes affected

ISL2 (HGNC:18524): (ISL LIM homeobox 2) Enables sequence-specific double-stranded DNA binding activity. Predicted to be involved in axonogenesis; neuron fate specification; and regulation of transcription by RNA polymerase II. Predicted to act upstream of or within negative regulation of neuron differentiation and neuron differentiation. Predicted to be part of chromatin. Predicted to be active in nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ENSG00000259514 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ISL2	NM_145805.3	c.752T>C	p.Ile251Thr	missense_variant	Exon 4 of 6	ENST00000290759.9	NP_665804.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ISL2	ENST00000290759.9	c.752T>C	p.Ile251Thr	missense_variant	Exon 4 of 6	1	NM_145805.3	ENSP00000290759.4
ISL2	ENST00000558656.1	n.489T>C		non_coding_transcript_exon_variant	Exon 3 of 5	5		ENSP00000453837.1
ENSG00000259514	ENST00000559539.1	n.173-24A>G		intron_variant	Intron 1 of 2	3

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460636 Hom.: 0 Cov.: 41 AF XY: 0.00 AC XY: 0 AN XY: 726528

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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

Alfa AF: 0.0000936 Hom.: 0

Bravo AF: 0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jul 23, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.752T>C (p.I251T) alteration is located in exon 4 (coding exon 4) of the ISL2 gene. This alteration results from a T to C substitution at nucleotide position 752, causing the isoleucine (I) at amino acid position 251 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.55	D
Eigen	Benign	0.17
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.89	D
M_CAP	Uncertain	0.15	D
MetaRNN	Uncertain	0.65	D
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Uncertain	2.7	M
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-4.1	D
REVEL	Uncertain	0.63
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0050	D
Polyphen		0.24	B
Vest4		0.66
MutPred		0.30		Loss of stability (P = 0.038);
MVP		0.90
MPC		1.5
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.80
gMVP		0.40

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: rs2040185590; hg19: chr15-76632857;