3-46459723-T-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_002343.6(LTF):c.140A>C(p.Lys47Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K47R) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: LTF NM_002343.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.40

Genes affected

LTF (HGNC:6720): (lactotransferrin) This gene is a member of the transferrin family of genes and its protein product is found in the secondary granules of neutrophils. The protein is a major iron-binding protein in milk and body secretions with an antimicrobial activity, making it an important component of the non-specific immune system. The protein demonstrates a broad spectrum of properties, including regulation of iron homeostasis, host defense against a broad range of microbial infections, anti-inflammatory activity, regulation of cellular growth and differentiation and protection against cancer development and metastasis. Antimicrobial, antiviral, antifungal and antiparasitic activity has been found for this protein and its peptides. Activity against both DNA and RNA viruses has been found, including activity against SARS-CoV-2, and HIV. [provided by RefSeq, Jul 2021]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.067961425).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LTF	NM_002343.6	c.140A>C	p.Lys47Thr	missense_variant	2/17	ENST00000231751.9
LTF	NM_001321121.2	c.140A>C	p.Lys47Thr	missense_variant	2/17
LTF	NM_001321122.2	c.101A>C	p.Lys34Thr	missense_variant	5/20
LTF	NM_001199149.2	c.8A>C	p.Lys3Thr	missense_variant	2/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LTF	ENST00000231751.9	c.140A>C	p.Lys47Thr	missense_variant	2/17	1	NM_002343.6	P3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.097
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
Cadd	Benign	0.010
Dann	Benign	0.82
DEOGEN2	Benign	0.14	T;.;.;.;.
Eigen	Benign	-1.9
Eigen_PC	Benign	-2.1
FATHMM_MKL	Benign	0.019	N
LIST_S2	Benign	0.36	T;T;T;T;T
M_CAP	Benign	0.0032	T
MetaRNN	Benign	0.068	T;T;T;T;T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	1.9	L;.;.;.;.
MutationTaster	Benign	1.0	P;P;P
PrimateAI	Benign	0.29	T
PROVEAN	Uncertain	-2.7	D;N;D;D;D
REVEL	Benign	0.047
Sift	Benign	0.21	T;D;T;T;T
Sift4G	Benign	0.33	T;T;T;T;T
Polyphen		0.0010	B;.;B;B;.
Vest4		0.19
MutPred		0.43		Loss of methylation at K47 (P = 0.0175);.;Loss of methylation at K47 (P = 0.0175);.;.;
MVP		0.19
MPC		0.083
ClinPred		0.090	T
GERP RS		-9.7
Varity_R		0.21
gMVP		0.63

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: rs1126478; hg19: chr3-46501213;