2-135799749-C-T

Position:

• chr2-135799749-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_002299.4(LCT):​c.4866+858G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.524 in 152,084 control chromosomes in the GnomAD database, including 24,515 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.52 (24515 hom., cov: 32)
• Consequence: LCT NM_002299.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.10

Genes affected

LCT (HGNC:6530): (lactase) The protein encoded by this gene belongs to the glycosyl hydrolase 1 family of proteins. The encoded preproprotein is proteolytically processed to generate the mature enzyme. This enzyme is integral to the plasma membrane and has both phlorizin hydrolase activity and lactase activity. Mutations in this gene are associated with congenital lactase deficiency. Polymorphisms in this gene are associated with lactase persistence, in which intestinal lactase activity persists at childhood levels into adulthood. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.706 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LCT	NM_002299.4	c.4866+858G>A		intron_variant		ENST00000264162.7	NP_002290.2
LCT	XM_017004088.3	c.4866+858G>A		intron_variant			XP_016859577.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LCT	ENST00000264162.7	c.4866+858G>A		intron_variant		1	NM_002299.4	ENSP00000264162.2
LCT	ENST00000452974.1	n.2960-1611G>A		intron_variant		1		ENSP00000391231.1

Frequencies

GnomAD3 genomes AF: 0.524 AC: 79624 AN: 151966 Hom.: 24514 Cov.: 32

Gnomad AFR AF: 0.259

Gnomad AMI AF: 0.777

Gnomad AMR AF: 0.419

Gnomad ASJ AF: 0.310

Gnomad EAS AF: 0.387

Gnomad SAS AF: 0.380

Gnomad FIN AF: 0.711

Gnomad MID AF: 0.253

Gnomad NFE AF: 0.711

Gnomad OTH AF: 0.459

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.524 AC: 79646 AN: 152084 Hom.: 24515 Cov.: 32 AF XY: 0.515 AC XY: 38270 AN XY: 74344

Gnomad4 AFR AF: 0.259

Gnomad4 AMR AF: 0.419

Gnomad4 ASJ AF: 0.310

Gnomad4 EAS AF: 0.386

Gnomad4 SAS AF: 0.381

Gnomad4 FIN AF: 0.711

Gnomad4 NFE AF: 0.711

Gnomad4 OTH AF: 0.455

Alfa AF: 0.606 Hom.: 35727

Bravo AF: 0.495

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.73
DANN	Benign	0.37

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: rs2322660; hg19: chr2-136557319;