rs362302

Variant names:

• chr4-3241193-C-T
• rs362302
• NM_001388492.1:c.*1134C>T

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001388492.1(HTT):​c.*1134C>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 0.0204 in 152,354 control chromosomes in the GnomAD database, including 79 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 0.020 (79 hom., cov: 34)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: HTT NM_001388492.1 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0990
• Publications: 2 publications found

Genes affected

HTT (HGNC:4851): (huntingtin) Huntingtin is a disease gene linked to Huntington's disease, a neurodegenerative disorder characterized by loss of striatal neurons. This is thought to be caused by an expanded, unstable trinucleotide repeat in the huntingtin gene, which translates as a polyglutamine repeat in the protein product. A fairly broad range of trinucleotide repeats (9-35) has been identified in normal controls, and repeat numbers in excess of 40 have been described as pathological. The huntingtin locus is large, spanning 180 kb and consisting of 67 exons. The huntingtin gene is widely expressed and is required for normal development. It is expressed as 2 alternatively polyadenylated forms displaying different relative abundance in various fetal and adult tissues. The larger transcript is approximately 13.7 kb and is expressed predominantly in adult and fetal brain whereas the smaller transcript of approximately 10.3 kb is more widely expressed. The genetic defect leading to Huntington's disease may not necessarily eliminate transcription, but may confer a new property on the mRNA or alter the function of the protein. One candidate is the huntingtin-associated protein-1, highly expressed in brain, which has increased affinity for huntingtin protein with expanded polyglutamine repeats. This gene contains an upstream open reading frame in the 5' UTR that inhibits expression of the huntingtin gene product through translational repression. [provided by RefSeq, Jul 2016]

HTT Gene-Disease associations (from GenCC):

• Huntington disease

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, Orphanet
• Lopes-Maciel-Rodan syndrome

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• juvenile Huntington disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

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

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0563 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001388492.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HTT	NM_001388492.1	MANE Select	c.*1134C>T		3_prime_UTR	Exon 67 of 67	NP_001375421.1	P42858
	HTT	NM_002111.8		c.*1134C>T		3_prime_UTR	Exon 67 of 67	NP_002102.4	P42858

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HTT	ENST00000355072.11	TSL:1 MANE Select	c.*1134C>T		3_prime_UTR	Exon 67 of 67	ENSP00000347184.5	P42858
	HTT	ENST00000510626.5	TSL:1	n.11691C>T		non_coding_transcript_exon	Exon 53 of 53
	HTT	ENST00000681528.1		c.*1134C>T		3_prime_UTR	Exon 68 of 68	ENSP00000506116.1	A0A7P0TAC5

Frequencies

GnomAD3 genomes AF: 0.0203 AC: 3087 AN: 152236 Hom.: 79 Cov.: 34

Gnomad AFR AF: 0.0581

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0103

Gnomad ASJ AF: 0.0135

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.00497

Gnomad FIN AF: 0.00103

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.00586

Gnomad OTH AF: 0.0167

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 82 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 56

African (AFR) AF: 0.00 AC: 0 AN: 4

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AF: 0.00 AC: 0 AN: 2

South Asian (SAS) AF: 0.00 AC: 0 AN: 2

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 22

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 40

Other (OTH) AF: 0.00 AC: 0 AN: 12

GnomAD4 genome AF: 0.0204 AC: 3101 AN: 152354 Hom.: 79 Cov.: 34 AF XY: 0.0193 AC XY: 1439 AN XY: 74502

African (AFR) AF: 0.0583 AC: 2422 AN: 41572

American (AMR) AF: 0.0103 AC: 158 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.0135 AC: 47 AN: 3472

East Asian (EAS) AF: 0.000193 AC: 1 AN: 5194

South Asian (SAS) AF: 0.00498 AC: 24 AN: 4824

European-Finnish (FIN) AF: 0.00103 AC: 11 AN: 10628

Middle Eastern (MID) AF: 0.0136 AC: 4 AN: 294

European-Non Finnish (NFE) AF: 0.00586 AC: 399 AN: 68042

Other (OTH) AF: 0.0166 AC: 35 AN: 2114

Alfa AF: 0.0116 Hom.: 42

Bravo AF: 0.0230

Asia WGS AF: 0.00433 AC: 15 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	6.8
DANN	Benign	0.81
PhyloP100		-0.099
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: rs362302; hg19: chr4-3242920;