1-11786602-ATTTTTTTTT-ATT

Variant names:

• chr1-11786602-ATTTTTTT-A
• rs55780505
• NM_005957.5:c.*4071_*4077delAAAAAAA

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS1

The NM_001330358.2(MTHFR):​c.*4071_*4077delAAAAAAA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.00023 (0 hom., cov: 0)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: MTHFR NM_001330358.2 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.308
• Publications: 3 publications found

Genes affected

MTHFR (HGNC:7436): (methylenetetrahydrofolate reductase) The protein encoded by this gene catalyzes the conversion of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, a co-substrate for homocysteine remethylation to methionine. Genetic variation in this gene influences susceptibility to occlusive vascular disease, neural tube defects, colon cancer and acute leukemia, and mutations in this gene are associated with methylenetetrahydrofolate reductase deficiency.[provided by RefSeq, Oct 2009]

C1orf167 (HGNC:25262): (chromosome 1 open reading frame 167) Implicated in coronary artery disease. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BS1: Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000225 (32/142218) while in subpopulation SAS AF = 0.00206 (9/4376). AF 95% confidence interval is 0.00107. There are 0 homozygotes in GnomAd4. There are 19 alleles in the male GnomAd4 subpopulation. Median coverage is 0. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001330358.2. 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
	MTHFR	NM_005957.5	MANE Select	c.*4071_*4077delAAAAAAA		3_prime_UTR	Exon 12 of 12	NP_005948.3
	C1orf167	NM_001010881.2	MANE Select	c.3568-773_3568-767delTTTTTTT		intron	N/A	NP_001010881.1
	MTHFR	NM_001330358.2		c.*4071_*4077delAAAAAAA		3_prime_UTR	Exon 12 of 12	NP_001317287.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MTHFR	ENST00000376590.9	TSL:1 MANE Select	c.*4071_*4077delAAAAAAA		3_prime_UTR	Exon 12 of 12	ENSP00000365775.3
	MTHFR	ENST00000376592.6	TSL:1	c.*4071_*4077delAAAAAAA		3_prime_UTR	Exon 12 of 12	ENSP00000365777.1
	C1orf167	ENST00000688073.1	MANE Select	c.3568-773_3568-767delTTTTTTT		intron	N/A	ENSP00000510540.1

Frequencies

GnomAD3 genomes AF: 0.000225 AC: 32 AN: 142188 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.000104

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00205

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000275

Gnomad OTH AF: 0.000512

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 4 Hom.: 0 AC XY: 0 AN XY: 0

African (AFR) AC: 0 AN: 0

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AC: 0 AN: 0

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AC: 0 AN: 0

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 4

Other (OTH) AC: 0 AN: 0

GnomAD4 genome AF: 0.000225 AC: 32 AN: 142218 Hom.: 0 Cov.: 0 AF XY: 0.000278 AC XY: 19 AN XY: 68446

African (AFR) AF: 0.000103 AC: 4 AN: 38656

American (AMR) AF: 0.00 AC: 0 AN: 14338

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3370

East Asian (EAS) AF: 0.00 AC: 0 AN: 4772

South Asian (SAS) AF: 0.00206 AC: 9 AN: 4376

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 8020

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 274

European-Non Finnish (NFE) AF: 0.000275 AC: 18 AN: 65558

Other (OTH) AF: 0.000508 AC: 1 AN: 1968

Alfa AF: 0.00 Hom.: 551

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.31

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs55780505; hg19: chr1-11846659;