chr16-11548144-A-C

Variant names:

• chr16-11548144-A-C
• rs77423500
• NM_001136472.2:c.*1493T>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Moderate BP6_Moderate BS1 BS2

The NM_001136472.2(LITAF):​c.*1493T>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00522 in 454,138 control chromosomes in the GnomAD database, including 54 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.013 (46 hom., cov: 32)
  • Exomes 𝑓: 0.0015 (8 hom.)
• Consequence: LITAF NM_001136472.2 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.996
• Publications: 1 publications found

Genes affected

LITAF (HGNC:16841): (lipopolysaccharide induced TNF factor) Lipopolysaccharide is a potent stimulator of monocytes and macrophages, causing secretion of tumor necrosis factor-alpha (TNF-alpha) and other inflammatory mediators. This gene encodes lipopolysaccharide-induced TNF-alpha factor, which is a DNA-binding protein and can mediate the TNF-alpha expression by direct binding to the promoter region of the TNF-alpha gene. The transcription of this gene is induced by tumor suppressor p53 and has been implicated in the p53-induced apoptotic pathway. Mutations in this gene cause Charcot-Marie-Tooth disease type 1C (CMT1C) and may be involved in the carcinogenesis of extramammary Paget's disease (EMPD). Multiple alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Dec 2014]

LITAF Gene-Disease associations (from GenCC):

• Charcot-Marie-Tooth disease type 1C

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• Charcot-Marie-Tooth disease

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.38).
• BP6: Variant 16-11548144-A-C is Benign according to our data. Variant chr16-11548144-A-C is described in ClinVar as [Benign]. Clinvar id is 317755.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0125 (1910/152344) while in subpopulation AFR AF = 0.0441 (1834/41566). AF 95% confidence interval is 0.0424. There are 46 homozygotes in GnomAd4. There are 884 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High AC in GnomAd4 at 1910 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LITAF	NM_001136472.2	c.*1493T>G		3_prime_UTR_variant	Exon 4 of 4	ENST00000622633.5	NP_001129944.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LITAF	ENST00000622633.5	c.*1493T>G		3_prime_UTR_variant	Exon 4 of 4	1	NM_001136472.2	ENSP00000483114.1
LITAF	ENST00000339430.9	c.*1493T>G		3_prime_UTR_variant	Exon 4 of 4	1		ENSP00000340118.5
LITAF	ENST00000571688.6	c.*1493T>G		3_prime_UTR_variant	Exon 4 of 4	1		ENSP00000459533.1
LITAF	ENST00000413364.6	c.*1618T>G		3_prime_UTR_variant	Exon 5 of 5	2		ENSP00000397958.2

Frequencies

GnomAD3 genomes AF: 0.0125 AC: 1904 AN: 152226 Hom.: 46 Cov.: 32

Gnomad AFR AF: 0.0441

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00373

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000103

Gnomad OTH AF: 0.00574

GnomAD2 exomes AF: 0.00248 AC: 323 AN: 130462 AF XY: 0.00168

Gnomad AFR exome AF: 0.0428

Gnomad AMR exome AF: 0.00214

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000402

Gnomad OTH exome AF: 0.00175

GnomAD4 exome AF: 0.00152 AC: 459 AN: 301794 Hom.: 8 Cov.: 0 AF XY: 0.00105 AC XY: 181 AN XY: 171996

African (AFR) AF: 0.0422 AC: 361 AN: 8554

American (AMR) AF: 0.00187 AC: 51 AN: 27274

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 10786

East Asian (EAS) AF: 0.00 AC: 0 AN: 9210

South Asian (SAS) AF: 0.0000671 AC: 4 AN: 59650

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 12364

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 1150

European-Non Finnish (NFE) AF: 0.0000315 AC: 5 AN: 158764

Other (OTH) AF: 0.00271 AC: 38 AN: 14042

GnomAD4 genome AF: 0.0125 AC: 1910 AN: 152344 Hom.: 46 Cov.: 32 AF XY: 0.0119 AC XY: 884 AN XY: 74502

African (AFR) AF: 0.0441 AC: 1834 AN: 41566

American (AMR) AF: 0.00373 AC: 57 AN: 15298

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5194

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10628

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000103 AC: 7 AN: 68034

Other (OTH) AF: 0.00568 AC: 12 AN: 2114

Alfa AF: 0.00594 Hom.: 5

Bravo AF: 0.0143

Asia WGS AF: 0.00289 AC: 10 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease type 1C Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.38
CADD	Benign	11
DANN	Benign	0.79
PhyloP100		1.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Mutation Taster		=100/0	polymorphism

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

Other links and lift over

dbSNP: rs77423500; hg19: chr16-11642000;